2024 Vol. 48, No. 7
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2024, 48(7): 073001. doi: 10.1088/1674-1137/ad380f
Abstract:
Signal reconstruction through software processing is a crucial component of the background and signal models in the PandaX-4T experiment, which is a multi-tonne dark matter direct search experiment. The accuracy of signal reconstruction is influenced by various detector artifacts, including noise, dark count of photomultiplier, photoionization of impurities in the detector, and other relevant considerations. In this study, we presented a detailed description of a semi-data-driven approach designed to simulate a signal waveform. This work provides a reliable model for the efficiency and bias of the signal reconstruction in the data analysis of PandaX-4T. By comparing critical variables that relate to the temporal shape and hit pattern of the signals, we found good agreement between the simulation and data.
Signal reconstruction through software processing is a crucial component of the background and signal models in the PandaX-4T experiment, which is a multi-tonne dark matter direct search experiment. The accuracy of signal reconstruction is influenced by various detector artifacts, including noise, dark count of photomultiplier, photoionization of impurities in the detector, and other relevant considerations. In this study, we presented a detailed description of a semi-data-driven approach designed to simulate a signal waveform. This work provides a reliable model for the efficiency and bias of the signal reconstruction in the data analysis of PandaX-4T. By comparing critical variables that relate to the temporal shape and hit pattern of the signals, we found good agreement between the simulation and data.
2024, 48(7): 073002. doi: 10.1088/1674-1137/ad3efe
Abstract:
Neutrinos from core-collapse supernovae are essential for understanding neutrino physics and stellar evolution. Dual-phase xenon dark matter detectors can be used to track explosions of galactic supernovae by detecting neutrinos through coherent elastic neutrino-nucleus scatterings. In this study, a variation of progenitor masses and explosion models are assumed to predict neutrino fluxes and spectra, which result in the number of expected neutrino events ranging from 6.6 to 13.7 at a distance of 10 kpc over a 10-s duration with negligible backgrounds at PandaX-4T. Two specialized triggering alarms for monitoring supernova burst neutrinos are built. The efficiency of detecting supernova explosions at various distances in the Milky Way is estimated. These alarms will be implemented in the real-time supernova monitoring system at PandaX-4T in the near future, which will provide supernova early warnings for the astronomical community.
Neutrinos from core-collapse supernovae are essential for understanding neutrino physics and stellar evolution. Dual-phase xenon dark matter detectors can be used to track explosions of galactic supernovae by detecting neutrinos through coherent elastic neutrino-nucleus scatterings. In this study, a variation of progenitor masses and explosion models are assumed to predict neutrino fluxes and spectra, which result in the number of expected neutrino events ranging from 6.6 to 13.7 at a distance of 10 kpc over a 10-s duration with negligible backgrounds at PandaX-4T. Two specialized triggering alarms for monitoring supernova burst neutrinos are built. The efficiency of detecting supernova explosions at various distances in the Milky Way is estimated. These alarms will be implemented in the real-time supernova monitoring system at PandaX-4T in the near future, which will provide supernova early warnings for the astronomical community.
2024, 48(7): 073003. doi: 10.1088/1674-1137/ad3dde
Abstract:
The prospects to study hyperon-nucleus/nucleon interactions at BESIII and similar\begin{document}$ e^+ e^- $\end{document} ![]()
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\begin{document}$ J/\psi $\end{document} ![]()
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\begin{document}$ \psi(3686) $\end{document} ![]()
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The prospects to study hyperon-nucleus/nucleon interactions at BESIII and similar
2024, 48(7): 073004. doi: 10.1088/1674-1137/ad4267
Abstract:
Possible light bosonic dark matter interactions with the Standard Model photon have been searched using microwave resonant cavities. In this paper, we describe the cryogenic readout system calibration of a 7.138 GHz copper cavity with a loaded quality factor\begin{document}$ Q_l=10^4 $\end{document} ![]()
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Possible light bosonic dark matter interactions with the Standard Model photon have been searched using microwave resonant cavities. In this paper, we describe the cryogenic readout system calibration of a 7.138 GHz copper cavity with a loaded quality factor
2024, 48(7): 073101. doi: 10.1088/1674-1137/ad3b9c
Abstract:
We present that by predicting the spectrum in discrete space from the phase shift in continuous space, the neural network can remarkably reproduce the numerical Lüscher's formula to a high precision. The model-independent property of the Lüscher's formula is naturally realized by the generalizability of the neural network. This exhibits the great potential of the neural network to extract model-independent relation between model-dependent quantities, and this data-driven approach could greatly facilitate the discovery of the physical principles underneath the intricate data.
We present that by predicting the spectrum in discrete space from the phase shift in continuous space, the neural network can remarkably reproduce the numerical Lüscher's formula to a high precision. The model-independent property of the Lüscher's formula is naturally realized by the generalizability of the neural network. This exhibits the great potential of the neural network to extract model-independent relation between model-dependent quantities, and this data-driven approach could greatly facilitate the discovery of the physical principles underneath the intricate data.
2024, 48(7): 073102. doi: 10.1088/1674-1137/ad3c2e
Abstract:
The heavy constituent quark pair of the heavy quarkonium is produced perturbatively and subsequently undergoes hadronization into the bound state non-perturbatively. The production of the heavy quarkonium is essential to testing our understanding of quantum chromodynamics (QCD) in both perturbative and non-perturbative aspects. The electron-positron collider will provide a suitable platform for the precise study of the heavy quarkonium. The higher excited heavy quarkonium may contribute significantly to the ground states, which should be considered for sound estimation. We study the production rates of the higher excited states quarkonium pair in\begin{document}$ e^+e^-\to Z^0 \to |(Q\bar{Q^\prime})[n]\rangle + |(Q^\prime \bar{Q})[n']\rangle $\end{document} ![]()
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\begin{document}$ Q,\; Q^\prime=c $\end{document} ![]()
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\begin{document}$ [n] $\end{document} ![]()
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\begin{document}$ [n^\prime] $\end{document} ![]()
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\begin{document}$ [n^1S_0],\; [n^3S_1],\; [n^1P_1] $\end{document} ![]()
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\begin{document}$ [n^3P_J] $\end{document} ![]()
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\begin{document}$ n=1,2,3;\; J=0,1,2 $\end{document} ![]()
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\begin{document}${\rm d}\sigma/{\rm d}{\rm cos}\theta$\end{document} ![]()
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The heavy constituent quark pair of the heavy quarkonium is produced perturbatively and subsequently undergoes hadronization into the bound state non-perturbatively. The production of the heavy quarkonium is essential to testing our understanding of quantum chromodynamics (QCD) in both perturbative and non-perturbative aspects. The electron-positron collider will provide a suitable platform for the precise study of the heavy quarkonium. The higher excited heavy quarkonium may contribute significantly to the ground states, which should be considered for sound estimation. We study the production rates of the higher excited states quarkonium pair in
2024, 48(7): 073103. doi: 10.1088/1674-1137/ad3c2c
Abstract:
In this study, we have investigated the mathematical components of the Dirac equation in curved spacetime and how they can be applied to the analysis of neutrino oscillations. More specifically, we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action that takes into account\begin{document}$ \Delta m^4 $\end{document} ![]()
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In this study, we have investigated the mathematical components of the Dirac equation in curved spacetime and how they can be applied to the analysis of neutrino oscillations. More specifically, we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action that takes into account
2024, 48(7): 073104. doi: 10.1088/1674-1137/ad3ddd
Abstract:
Vectorlike quarks (VLQs) with masses at the TeV-scale have been predicted in many new physics scenarios beyond the Standard Model (SM). Based on a simplified\begin{document}$ \left(X,T\right) $\end{document} ![]()
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\begin{document}$ 5/3 $\end{document} ![]()
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\begin{document}$ tW $\end{document} ![]()
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\begin{document}$ \sqrt{s}=3 $\end{document} ![]()
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\begin{document}$ 2\sigma $\end{document} ![]()
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\begin{document}$ 5\sigma $\end{document} ![]()
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\begin{document}$ m_{X} $\end{document} ![]()
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\begin{document}${\rm Br}(X\to tW)$\end{document} ![]()
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\begin{document}$ m_{X}<1500 $\end{document} ![]()
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\begin{document}$ g^{*} $\end{document} ![]()
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\begin{document}$ m_{X}\geq1500 $\end{document} ![]()
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Vectorlike quarks (VLQs) with masses at the TeV-scale have been predicted in many new physics scenarios beyond the Standard Model (SM). Based on a simplified
2024, 48(7): 073105. doi: 10.1088/1674-1137/ad4268
Abstract:
Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector, we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the minimal dilaton model at the 14 TeV LHC. Initially, we identify the correlations between the production cross section, decay branching ratios, and model parameters, e.g., the scalar mixing angle\begin{document}$ \sin\theta_S $\end{document} ![]()
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\begin{document}$ pp \to t\bar{t}(s\to \gamma\gamma) $\end{document} ![]()
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\begin{document}$ tt\gamma\gamma $\end{document} ![]()
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\begin{document}$ L = 3000 \; {{\rm{fb}}}^{-1} $\end{document} ![]()
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\begin{document}$ |\sin\theta_S|>0.2 $\end{document} ![]()
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\begin{document}$ 3\sigma $\end{document} ![]()
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Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector, we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the minimal dilaton model at the 14 TeV LHC. Initially, we identify the correlations between the production cross section, decay branching ratios, and model parameters, e.g., the scalar mixing angle
2024, 48(7): 073106. doi: 10.1088/1674-1137/ad39cd
Abstract:
The S-wave\begin{document}$ \bar{q}q\bar{s}Q \;\; (q=u,\,d;\,Q=c,\,b) $\end{document} ![]()
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\begin{document}$ J^P=0^+ $\end{document} ![]()
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\begin{document}$ 1^+ $\end{document} ![]()
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\begin{document}$ 2^+ $\end{document} ![]()
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\begin{document}$ \bar{q}q\bar{s}c $\end{document} ![]()
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\begin{document}$ \bar{q}q\bar{s}b $\end{document} ![]()
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\begin{document}$ I(J^P) $\end{document} ![]()
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\begin{document}$ 2.4-3.4 $\end{document} ![]()
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\begin{document}$ 5.7-6.7 $\end{document} ![]()
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The S-wave
2024, 48(7): 074001. doi: 10.1088/1674-1137/ad4264
Abstract:
The complete and incomplete fusion cross sections for 6Li+209Bi were measured using the in-beam γ-ray method around the Coulomb barrier. The cross sections of (deuteron captured) incomplete fusion (ICF) products were re-quantified experimentally for this reaction system. The results reveal that the ICF cross section is equivalent to that of complete fusion (CF) above the Coulomb barrier and dominant near or below the Coulomb barrier. A theoretical calculation based on the continuum discretized coupled channel (CDCC) method was performed for the aforementioned CF and ICF cross sections; the result is consistent with the experiments. The universal fusion function (UFF) was also compared with the measured CF cross section for different barrier parameters, demonstrating that the CF suppression factor is significantly influenced by the choice of potential, which can reflect both dynamic and static effects of breakup on the fusion process.
The complete and incomplete fusion cross sections for 6Li+209Bi were measured using the in-beam γ-ray method around the Coulomb barrier. The cross sections of (deuteron captured) incomplete fusion (ICF) products were re-quantified experimentally for this reaction system. The results reveal that the ICF cross section is equivalent to that of complete fusion (CF) above the Coulomb barrier and dominant near or below the Coulomb barrier. A theoretical calculation based on the continuum discretized coupled channel (CDCC) method was performed for the aforementioned CF and ICF cross sections; the result is consistent with the experiments. The universal fusion function (UFF) was also compared with the measured CF cross section for different barrier parameters, demonstrating that the CF suppression factor is significantly influenced by the choice of potential, which can reflect both dynamic and static effects of breakup on the fusion process.
2024, 48(7): 074101. doi: 10.1088/1674-1137/ad432c
Abstract:
A cross section evaluation of neutron induced reactions on 48Ti is undertaken using the Unified Monte Carlo-B (UMC-B) approach. The evaluation concentrates on estimating the covariance and the use of the UMC-B allows avoiding the deficiencies of linear regression brought by the traditional least squares method. Eight main neutron and charged particle emission reactions from n+48Ti in the fast neutron energy region below 20 MeV are studied in this work. The posterior probability density function (PDF) of each neutron cross section is obtained in a UMC-B Bayesian approach by convoluting the model PDFs sampled based on model parameters and the likelihood functions for the experimental data. Nineteen model parameters including level density, pair corrections, optical model and Kalbach matrix element parameter are stochastically sampled with the assumption of normal distributions to estimate the model uncertainty. The Cholesky factorization approach is applied to consider potential parameter correlations. Finally, the posterior covariance matrices are generated using the UMC-B generated weights. The new evaluated results are compared with the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, TENDL-2021 and JENDL-5 evaluations and differences are discussed.
A cross section evaluation of neutron induced reactions on 48Ti is undertaken using the Unified Monte Carlo-B (UMC-B) approach. The evaluation concentrates on estimating the covariance and the use of the UMC-B allows avoiding the deficiencies of linear regression brought by the traditional least squares method. Eight main neutron and charged particle emission reactions from n+48Ti in the fast neutron energy region below 20 MeV are studied in this work. The posterior probability density function (PDF) of each neutron cross section is obtained in a UMC-B Bayesian approach by convoluting the model PDFs sampled based on model parameters and the likelihood functions for the experimental data. Nineteen model parameters including level density, pair corrections, optical model and Kalbach matrix element parameter are stochastically sampled with the assumption of normal distributions to estimate the model uncertainty. The Cholesky factorization approach is applied to consider potential parameter correlations. Finally, the posterior covariance matrices are generated using the UMC-B generated weights. The new evaluated results are compared with the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, TENDL-2021 and JENDL-5 evaluations and differences are discussed.
2024, 48(7): 074102. doi: 10.1088/1674-1137/ad3d4b
Abstract:
In this paper, using the α particle preformation probabilities\begin{document}$ P_{\alpha} $\end{document} ![]()
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\begin{document}$ V_0=162.6 $\end{document} ![]()
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\begin{document}$ \sigma=0.322 $\end{document} ![]()
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\begin{document}$ d\sqrt{l(l+1)} $\end{document} ![]()
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\begin{document}$ d=0.381 $\end{document} ![]()
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\begin{document}$ Z = 117,118,119 $\end{document} ![]()
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In this paper, using the α particle preformation probabilities
2024, 48(7): 074103. doi: 10.1088/1674-1137/ad39cc
Abstract:
We explore the properties of 4110 nuclides from\begin{document}$ Z=5 $\end{document} ![]()
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\begin{document}$ Z=82 $\end{document} ![]()
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We explore the properties of 4110 nuclides from
2024, 48(7): 074104. doi: 10.1088/1674-1137/ad4269
Abstract:
The consistent three-body model reaction methodology (TBMRM) proposed by J. Lee et al. [ Phys. Rev. C 69, 064313 (2004); Phys. Rev. C 73, 044608 (2006); Phys. Rev. C 75, 064320 (2007)], which includes adopting the simple zero-range adiabatic wave approximation, constraining the single-particle potentials using modern Hartree–Fock calculations, and using global nucleon optical model potential (OMP) geometries, are widely applied in systematic studies of transfer reactions. In this study, we investigate the influence of different nucleon OMPs in extracting spectroscopic factors (SFs) from (\begin{document}$ p, d $\end{document} ![]()
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\begin{document}$ p, d $\end{document} ![]()
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\begin{document}$ p, d $\end{document} ![]()
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\begin{document}$ e, e'p $\end{document} ![]()
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The consistent three-body model reaction methodology (TBMRM) proposed by J. Lee et al. [ Phys. Rev. C 69, 064313 (2004); Phys. Rev. C 73, 044608 (2006); Phys. Rev. C 75, 064320 (2007)], which includes adopting the simple zero-range adiabatic wave approximation, constraining the single-particle potentials using modern Hartree–Fock calculations, and using global nucleon optical model potential (OMP) geometries, are widely applied in systematic studies of transfer reactions. In this study, we investigate the influence of different nucleon OMPs in extracting spectroscopic factors (SFs) from (
2024, 48(7): 074105. doi: 10.1088/1674-1137/ad3b9d
Abstract:
Accurate and reliable nuclear decay databases are essential for fundamental and applied nuclear research studies. However, decay data are not usually as accurate as expected and need improvement. Hence, a new Chinese nuclear decay database in the fission product mass region (A = 66−172) based on several major national evaluated data libraries has been developed under joint efforts in the CNDC working group. A total of 2358 nuclides have been included in this decay database. Two main data formats, namely ENSDF and ENDF, have been adopted. For the total mean β and γ energies, available data from total absorption gamma ray spectroscopy measurements have been adopted. For some nuclides without experimental measurements, theoretically calculated values have been added.
Accurate and reliable nuclear decay databases are essential for fundamental and applied nuclear research studies. However, decay data are not usually as accurate as expected and need improvement. Hence, a new Chinese nuclear decay database in the fission product mass region (A = 66−172) based on several major national evaluated data libraries has been developed under joint efforts in the CNDC working group. A total of 2358 nuclides have been included in this decay database. Two main data formats, namely ENSDF and ENDF, have been adopted. For the total mean β and γ energies, available data from total absorption gamma ray spectroscopy measurements have been adopted. For some nuclides without experimental measurements, theoretically calculated values have been added.
2024, 48(7): 074106. doi: 10.1088/1674-1137/ad47aa
Abstract:
Neutron-rich P, Cl, and K isotopes, particularly those with neutron numbers of approximately\begin{document}$ N=28 $\end{document} ![]()
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\begin{document}$ 3/2_1^+ $\end{document} ![]()
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\begin{document}$ 1/2_1^+ $\end{document} ![]()
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\begin{document}$ \pi 0d_{3/2} $\end{document} ![]()
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\begin{document}$ \pi 1s_{1/2} $\end{document} ![]()
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\begin{document}$ Z=14 $\end{document} ![]()
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\begin{document}$ 16 $\end{document} ![]()
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\begin{document}$ Z=14 $\end{document} ![]()
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\begin{document}$ 16 $\end{document} ![]()
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Neutron-rich P, Cl, and K isotopes, particularly those with neutron numbers of approximately
2024, 48(7): 075101. doi: 10.1088/1674-1137/ad34c1
Abstract:
We investigate the dynamic and thermodynamic laws governing rotating regular black holes. By analyzing dynamic properties, i.e., the interaction between scalar particles and rotating regular black holes, we establish the criteria that determine whether such black holes satisfy the laws of thermodynamics. In addition, we provide the general form of conserved quantities related to rotating regular black holes, including the relevant flows associated with neutral scalar particles. Meanwhile, we reexamine the relationship between the third law of thermodynamics and weak cosmic censorship conjecture for rotating regular black holes. Based on the abovementioned criteria, we discuss the laws of thermodynamics for three models of rotating regular black holes: Rotating Hayward black holes, Kerr black-bounce solutions, and loop quantum gravity black holes. Our findings indicate that none of the three models satisfies the first law of thermodynamics. In particular, the first and third models fail to comply with the three laws of thermodynamics, whereas the second model satisfies only the second and third laws of thermodynamics. Finally, we attempt to rescue the laws of thermodynamics by modifying entropy or extending the phase space. However, the two scenarios cannot ensure the three laws of thermodynamics in the three models, which reveals an unusual property of rotating regular black holes.
We investigate the dynamic and thermodynamic laws governing rotating regular black holes. By analyzing dynamic properties, i.e., the interaction between scalar particles and rotating regular black holes, we establish the criteria that determine whether such black holes satisfy the laws of thermodynamics. In addition, we provide the general form of conserved quantities related to rotating regular black holes, including the relevant flows associated with neutral scalar particles. Meanwhile, we reexamine the relationship between the third law of thermodynamics and weak cosmic censorship conjecture for rotating regular black holes. Based on the abovementioned criteria, we discuss the laws of thermodynamics for three models of rotating regular black holes: Rotating Hayward black holes, Kerr black-bounce solutions, and loop quantum gravity black holes. Our findings indicate that none of the three models satisfies the first law of thermodynamics. In particular, the first and third models fail to comply with the three laws of thermodynamics, whereas the second model satisfies only the second and third laws of thermodynamics. Finally, we attempt to rescue the laws of thermodynamics by modifying entropy or extending the phase space. However, the two scenarios cannot ensure the three laws of thermodynamics in the three models, which reveals an unusual property of rotating regular black holes.
2024, 48(7): 075102. doi: 10.1088/1674-1137/ad3942
Abstract:
Fast radio bursts (FRBs) are useful cosmological probes with numerous applications in cosmology. The distribution of the dispersion measurement contribution from the intergalactic medium is a key issue. A quasi-Gaussian distribution has been used to replace the traditional Gaussian distribution, yielding promising results. However, this study suggests that there may be additional challenges in its application. We used 35 well-localized FRBs to constrain the Hubble constant\begin{document}$ H_0 $\end{document} ![]()
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\begin{document}$H_0=60.99^{+4.57}_{-4.90}\ {\rm{km\; s^{-1}}\; Mpc^{-1}}$\end{document} ![]()
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\begin{document}$ H_0 $\end{document} ![]()
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\begin{document}$ H_0 $\end{document} ![]()
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Fast radio bursts (FRBs) are useful cosmological probes with numerous applications in cosmology. The distribution of the dispersion measurement contribution from the intergalactic medium is a key issue. A quasi-Gaussian distribution has been used to replace the traditional Gaussian distribution, yielding promising results. However, this study suggests that there may be additional challenges in its application. We used 35 well-localized FRBs to constrain the Hubble constant
2024, 48(7): 075103. doi: 10.1088/1674-1137/ad3c2d
Abstract:
This paper investigates observable signatures of hot spots orbiting Reissner-Nordström (RN) black holes and naked singularities. For an RN black hole, we find two discernible lensing image tracks in time integrated images, capturing a complete orbit of hot spots and a image shadow within the critical curve where photons with a small impact parameter fall into the event horizon. Conversely, in RN singularities, additional image tracks can be found within the critical curve, originating from photons reflected by the infinitely high effective potential well. Moreover, we find incomplete and converging tracks from the time integrated images of hot spot orbiting RN singularities that have no photon sphere. The presence of these additional image tracks significantly influences temporal magnitudes at their local maxima, enabling us to differentiate between RN black holes and RN naked singularities.
This paper investigates observable signatures of hot spots orbiting Reissner-Nordström (RN) black holes and naked singularities. For an RN black hole, we find two discernible lensing image tracks in time integrated images, capturing a complete orbit of hot spots and a image shadow within the critical curve where photons with a small impact parameter fall into the event horizon. Conversely, in RN singularities, additional image tracks can be found within the critical curve, originating from photons reflected by the infinitely high effective potential well. Moreover, we find incomplete and converging tracks from the time integrated images of hot spot orbiting RN singularities that have no photon sphere. The presence of these additional image tracks significantly influences temporal magnitudes at their local maxima, enabling us to differentiate between RN black holes and RN naked singularities.
2024, 48(7): 075104. doi: 10.1088/1674-1137/ad3b7e
Abstract:
Considering the nonminimal coupling of the dilaton field to the massive graviton field in Maxwell-dilaton-massive gravity, we obtain a class of analytical solutions of charged black holes, which are neither asymptotically flat nor (A)dS. The calculated thermodynamic quantities, such as mass, temperature, and entropy, verify the validity of the first law of black hole thermodynamics. Moreover, we further investigate the critical behaviors of these black holes in the grand canonical and canonical ensembles and find a novel critical phenomenon never before observed, known as the "reverse" reentrant phase transition with a tricritical point. It implies that the system undergoes a novel "SBH-LBH-SBH" phase transition process and is the reverse of the "LBH-SBH-LBH" process observed in reentrant phase transitions.
Considering the nonminimal coupling of the dilaton field to the massive graviton field in Maxwell-dilaton-massive gravity, we obtain a class of analytical solutions of charged black holes, which are neither asymptotically flat nor (A)dS. The calculated thermodynamic quantities, such as mass, temperature, and entropy, verify the validity of the first law of black hole thermodynamics. Moreover, we further investigate the critical behaviors of these black holes in the grand canonical and canonical ensembles and find a novel critical phenomenon never before observed, known as the "reverse" reentrant phase transition with a tricritical point. It implies that the system undergoes a novel "SBH-LBH-SBH" phase transition process and is the reverse of the "LBH-SBH-LBH" process observed in reentrant phase transitions.
2024, 48(7): 075105. doi: 10.1088/1674-1137/ad3f95
Abstract:
In this study, we constructed ten dark energy models to test whether they can reconcile the Hubble tension and how much it is affected by parameterization. To establish a fair test, the models are diverse, encompassing fractional, logarithmic, exponential, and inverse exponential forms as well as several non-parameterized models. The dataset we used includes the NPIPE pipeline of cosmic microwave background (CMB) power-spectrum data from Planck2020, Pantheon+ samples from Supernovae Type Ia, and baryon acoustic oscillations. The MCMC calculations imply dark energy transferring from\begin{document}$ w< -1 $\end{document} ![]()
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\begin{document}$ w > -1 $\end{document} ![]()
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\begin{document}$ w < -1 $\end{document} ![]()
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\begin{document}$ 0.1808\sigma $\end{document} ![]()
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\begin{document}$ {\rm d}w/{\rm d}a $\end{document} ![]()
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\begin{document}$ C^{TT} $\end{document} ![]()
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\begin{document}$ P(k) $\end{document} ![]()
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In this study, we constructed ten dark energy models to test whether they can reconcile the Hubble tension and how much it is affected by parameterization. To establish a fair test, the models are diverse, encompassing fractional, logarithmic, exponential, and inverse exponential forms as well as several non-parameterized models. The dataset we used includes the NPIPE pipeline of cosmic microwave background (CMB) power-spectrum data from Planck2020, Pantheon+ samples from Supernovae Type Ia, and baryon acoustic oscillations. The MCMC calculations imply dark energy transferring from
2024, 48(7): 075106. doi: 10.1088/1674-1137/ad3eff
Abstract:
Horndeski theory constitutes the most general model of scalar-tensor theories. It has attracted much attention in recent years in relation with black holes, celestial dynamics, stability analysis, etc. It is important to note that, for certain subclasses of Horndeski models, one can obtain analytic solutions for the background fields. This facilitates the investigation of the corresponding stability problems in detail. In particular, we aim to determine the constraints to the model or theory under which the stability conditions can be satisfied. In this study, we focused on a subclass of Horndeski theory and a set of analytic background solutions. In addition, the odd-parity gravitational perturbation and 2nd-order Lagrangian were investigated. Through careful analysis, the instability was identified within the neighborhood of the event horizon. This allows exclusion of a specific geometry for the model. Such an instability is implanted in the structure of the corresponding Lagrangian and is not erased by simply adding numerical constraints on the coupling parameters. As a starting point of our research, the current study provides insights for further exploration of the Horndeski theory.
Horndeski theory constitutes the most general model of scalar-tensor theories. It has attracted much attention in recent years in relation with black holes, celestial dynamics, stability analysis, etc. It is important to note that, for certain subclasses of Horndeski models, one can obtain analytic solutions for the background fields. This facilitates the investigation of the corresponding stability problems in detail. In particular, we aim to determine the constraints to the model or theory under which the stability conditions can be satisfied. In this study, we focused on a subclass of Horndeski theory and a set of analytic background solutions. In addition, the odd-parity gravitational perturbation and 2nd-order Lagrangian were investigated. Through careful analysis, the instability was identified within the neighborhood of the event horizon. This allows exclusion of a specific geometry for the model. Such an instability is implanted in the structure of the corresponding Lagrangian and is not erased by simply adding numerical constraints on the coupling parameters. As a starting point of our research, the current study provides insights for further exploration of the Horndeski theory.
2024, 48(7): 075107. doi: 10.1088/1674-1137/ad32bf
Abstract:
Here, we study the quantum coherence of N-partite Greenberger-Horne-Zeilinger (GHZ) and W states in the multiverse consisting of N causally disconnected de Sitter spaces. Interestingly, N-partite coherence increases monotonically with curvature, whereas the curvature effect destroys quantum entanglement and discord, indicating that the curvature effect is beneficial to quantum coherence and harmful to quantum correlations in the multiverse. We find that with an increase in n expanding de Sitter spaces, the N-partite coherence of the GHZ state increases monotonically for any curvature, whereas the quantum coherence of the W state decreases or increases monotonically depending on the curvature. We find a distribution relationship, which indicates that the correlated coherence of the N-partite W state is equal to the sum of all bipartite correlated coherence in the multiverse. Multipartite coherence exhibits unique properties in the multiverse, suggesting that it may provide some evidence for the existence of the multiverse.
Here, we study the quantum coherence of N-partite Greenberger-Horne-Zeilinger (GHZ) and W states in the multiverse consisting of N causally disconnected de Sitter spaces. Interestingly, N-partite coherence increases monotonically with curvature, whereas the curvature effect destroys quantum entanglement and discord, indicating that the curvature effect is beneficial to quantum coherence and harmful to quantum correlations in the multiverse. We find that with an increase in n expanding de Sitter spaces, the N-partite coherence of the GHZ state increases monotonically for any curvature, whereas the quantum coherence of the W state decreases or increases monotonically depending on the curvature. We find a distribution relationship, which indicates that the correlated coherence of the N-partite W state is equal to the sum of all bipartite correlated coherence in the multiverse. Multipartite coherence exhibits unique properties in the multiverse, suggesting that it may provide some evidence for the existence of the multiverse.
2024, 48(7): 075108. doi: 10.1088/1674-1137/ad3e67
Abstract:
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This paper investigates the physical properties and predicted radii of compact stars generated by the Tolman-IV complexity-free model within the background of modified gravity theory, particularly the
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