• [1]

    S. Furlanetto, S. P. Oh, and F. Briggs, Phys. Rept. 433, 181-301 (2006), arXiv:astroph/0608032[astro-ph

  • [2]

    M. F. Morales and J. S. B. Wyithe, Ann. Rev. Astron. Astrophys. 48, 127-171 (2010), arXiv:0910.3010 [astroph.CO

  • [3]

    J. R. Pritchard and A. Loeb, Rept. Prog. Phys. 75, 086901 (2012), arXiv:1109.6012[astroph.CO

  • [4]

    J. D. Bowman, A. E. E. Rogers, R. A. Monsalve et al., Nature 555(7694), 67-70 (2018), arXiv:1810.05912[astro-ph.CO

  • [5]

    A. Cohen, A. Fialkov, R. Barkana et al., Mon. Not. Roy. Astron. Soc. 472(2), 1915-1931 (2017), arXiv:1609.02312[astro-ph.CO

  • [6]

    C. Feng and G. Holder, Astrophys. J. Lett. 858(2), L17 (2018), arXiv:1802.07432[astro-ph.CO

  • [7]

    S. Fraser, A. Hektor, G. Hütsi et al., Phys. Lett. B 785, 159-164 (2018), arXiv:1803.03245[hep-ph

  • [8]

    T. Moroi, K. Nakayama, and Y. Tang, Phys. Lett. B 783, 301-305 (2018), arXiv:1804.10378[hep-ph

  • [9]

    E. D. Kovetz, I. Cholis, and D. E. Kaplan, Phys. Rev. D 99(12), 123511 (2019), arXiv:1809.01139[astro-ph.CO

  • [10]

    J. B. Muñoz and A. Loeb, Nature 557(7707), 684 (2018), arXiv:1802.10094[astro-ph.CO

  • [11]

    A. Fialkov, R. Barkana, and A. Cohen, Phys. Rev. Lett. 121, 011101 (2018), arXiv:1802.10577[astro-ph.CO

  • [12]

    A. Berlin, D. Hooper, G. Krnjaic et al., Phys. Rev. Lett. 121(1), 011102 (2018), arXiv:1803.02804[hep-ph

  • [13]

    R. Barkana, N. J. Outmezguine, D. Redigolo et al., Phys. Rev. D 98(10), 103005 (2018), arXiv:1803.03091[hep-ph

  • [14]

    R. Barkana, Nature 555(7694), 71-74 (2018), arXiv:1803.06698[astroph.CO

  • [15]

    T. R. Slatyer and C. Wu, Phys. Rev. D 98(2), 023013 (2018), arXiv:1803.09734[astro-ph.CO

  • [16]

    L. B. Jia, Eur. Phys. J. C 79(1), 80 (2019), arXiv:1804.07934[hep-ph

  • [17]

    N. Houston, C. Li, T. Li et al., Phys. Rev. Lett. 121(11), 111301 (2018), arXiv:1805.04426[hep-ph

  • [18]

    P. Sikivie, Phys. Dark Univ. 24, 100289 (2019), arXiv:1805.05577[astro-ph.CO

  • [19]

    E. D. Kovetz, V. Poulin, V. Gluscevic et al., Phys. Rev. D 98(10), 103529 (2018), arXiv:1807.11482[astro-ph.CO

  • [20]

    K. K. Boddy, V. Gluscevic, V. Poulin et al., Phys. Rev. D 98(12), 123506 (2018), arXiv:1808.00001[astro-ph.CO

  • [21]

    C. Creque-Sarbinowski, L. Ji, E. D. Kovetz et al., Phys. Rev. D 100(2), 023528 (2019), arXiv:1903.09154[astro-ph.CO

  • [22]

    H. Liu, N. J. Outmezguine, D. Redigolo et al., Phys. Rev. D 100(12), 123011 (2019), arXiv:1908.06986[hep-ph

  • [23]

    A. Aboubrahim, P. Nath, and Z. Y. Wang, EDGES data as a signal of the Stueckelberg mechanism in the early universe, arXiv: 2108.05819[hep-ph]

  • [24]

    S. Clark, B. Dutta, Y. Gao et al., Phys. Rev. D 98(4), 043006 (2018), arXiv:1803.09390[astro-ph.HE

  • [25]

    K. Cheung, J. L. Kuo, K. W. Ng et al., Phys. Lett. B 789, 137-144 (2019), arXiv:1803.09398[astro-ph.CO

  • [26]

    C. Li and Y. F. Cai, Phys. Lett. B 788, 70-75 (2019), arXiv:1804.04816[astro-ph.CO

  • [27]

    A. Halder, M. Pandey, D. Majumdar et al., JCAP 10, 033 (2021), arXiv:2105.14356[astro-ph.CO

  • [28]

    A. A. Prinz, R. Baggs, J. Ballam et al., Phys. Rev. Lett. 81, 1175-1178 (1998), arXiv:hep-ex/9804008[hep-ex

  • [29]

    S. Dubovsky, D. Gorbunov, and G. Rubtsov, JETP Lett. 79, 1-5 (2004), arXiv:hepph/0311189[hep-ph

  • [30]

    A. Dolgov, S. Dubovsky, G. Rubtsov et al., Phys. Rev. D 88(11), 117701 (2013), arXiv:1310.2376[hep-ph

  • [31]

    R. de Putter, O. Dor, J. Gleyzes et al., Phys. Rev. Lett. 122(4), 041301 (2019), arXiv:1805.11616[astro-ph.CO

  • [32]

    J. H. Chang, R. Essig, and S. D. McDermott, JHEP 09, 051 (2018), arXiv:1803.00993[hepph

  • [33]

    C. Boehm, M. J. Dolan, and C. McCabe, JCAP 08, 041 (2013), arXiv:1303.6270[hep-ph

  • [34]

    P. F. Depta, M. Hufnagel, K. Schmidt-Hoberg et al., JCAP 04, 029 (2019), arXiv:1901.06944[hep-ph

  • [35]

    B. Kors and P. Nath, JHEP 07, 069 (2005), arXiv:hep-ph/0503208[hep-ph

  • [36]

    D. Feldman, Z. Liu, and P. Nath, Phys. Rev. Lett. 97, 021801 (2006), arXiv:hep-ph/0603039[hep-ph

  • [37]

    D. Feldman, Z. Liu, and P. Nath, JHEP 11, 007 (2006), arXiv:hep-ph/0606294[hep-ph

  • [38]

    D. Feldman, Z. Liu, and P. Nath, Phys. Rev. D 75, 115001 (2007), arXiv:hep-ph/0702123[hep-ph

  • [39]

    D. Feldman, Z. Liu, P. Nath et al., Phys. Rev. D 80, 075001 (2009), arXiv:0907.5392[hep-ph

  • [40]

    M. Du, Z. Liu, and V. Tran, JHEP 05, 055 (2020), arXiv:1912.00422[hep-ph

  • [41]

    P. Nath, Mod. Phys. Lett. A 25, 3003-3016 (2010), arXiv:0812.0958[hep-ph

  • [42]

    T. J. Allen, M. J. Bowick, and A. Lahiri, Mod. Phys. Lett. A 6, 559-572 (1991)

  • [43]

    A. E. Nelson and J. Scholtz, Phys. Rev. D 84, 103501 (2011), arXiv:1105.2812[hep-ph

  • [44]

    J. M. Cline, G. Dupuis, Z. Liu et al., JHEP 08, 131 (2014), arXiv:1405.7691[hep-ph

  • [45]

    E. W. Kolb and M. S. Turner, Front. Phys. 69, 1-547 (1990)

  • [46]

    P. Ade et al., Astron. Astrophys. 594, A13 (2016), arXiv:1502.01589[astro-ph.CO

  • [47]

    J. B. Muñoz, E. D. Kovetz, and Y. Ali-Haïmoud, Phys. Rev. D 92(8), 083528 (2015), arXiv:1509.00029[astro-ph.CO

  • [48]

    S. Seager, D. D. Sasselov, and D. Scott, Astrophys. J. Suppl. 128, 407-430 (2000), arXiv:astro-ph/9912182[astro-ph

  • [49]

    P. J. E. Peebles, Principles of physical cosmology

  • [50]

    Y. Ali-Haimoud and C. M. Hirata, Phys. Rev. D 83, 043513 (2011), arXiv:1011.3758[astro-ph.CO

  • [51]

    S. S. McGaugh, Phys. Rev. Lett. 121(8), 081305 (2018), arXiv:1808.02532[astro-ph.CO

  • [52]

    S. Chatrchyan et al., Phys. Rev. D 87(9), 092008 (2013), arXiv:1210.2311[hepex

  • [53]

    G. Magill, R. Plestid, M. Pospelov et al., Phys. Rev. Lett. 122(7), 071801 (2019), arXiv:1806.03310[hepph

  • [54]

    R. Acciarri et al., Phys. Rev. Lett. 124(13), 131801 (2020), arXiv:1911.07996[hep-ex

  • [55]

    A. Ball, G. Beauregard, J. Brooke et al., Phys. Rev. D 102(3), 032002 (2020), arXiv:2005.06518[hep-ex

  • [56]

    S. Davidson, S. Hannestad, and G. Raffelt, JHEP 05, 003 (2000), arXiv:hep-ph/0001179[hep-ph

  • [57]

    A. Badertscher, P. Crivelli, W. Fetscher et al., Phys. Rev. D 75, 032004 (2007), arXiv:hep-ex/0609059[hep-ex

  • [58]

    T. Emken, R. Essig, C. Kouvaris et al., JCAP 09, 070 (2019), arXiv:1905.06348[hep-ph

  • [59]

    M. S. Mahdawi and G. R. Farrar, JCAP 10, 007 (2018), arXiv:1804.03073[hep-ph

  • [60]

    M. Fabbrichesi, E. Gabrielli, and G. Lanfranchi, The Dark Photon, arXiv: 2005.01515[hep-ph]

  • [61]

    W. L. Xu, C. Dvorkin, and A. Chael, Phys. Rev. D 97(10), 103530 (2018), arXiv:1802.06788[astro-ph.CO

  • [62]

    T. R. Slatyer, N. Padmanabhan, and D. P. Finkbeiner, Phys. Rev. D 80, 043526 (2009), arXiv:0906.1197[astro-ph.CO

  • [63]

    T. R. Slatyer, Phys. Rev. D 87(12), 123513 (2013), arXiv:1211.0283[astro-ph.CO

  • [64]

    N. Aghanim et al. (Planck), Planck 2018 results. VI. Cosmological parameters, Astron. Astrophys. A 641, 6 (2020) [Erratum: Astron. Astrophys. C 652, 4 (2021)], arXiv: 1807.06209[astro-ph.CO]

  • [65]

    M. Kawasaki, K. Nakayama, and T. Sekiguchi, Phys. Lett. B 756, 212-215 (2016), arXiv:1512.08015[astro-ph.CO

  • [66]

    W. C. Huang, J. L. Kuo, and Y. L. S. Tsai, JCAP 06, 025 (2021), arXiv:2101.10360[astro-ph.CO

  • [67]

    S. Dodelson, Modern Cosmology

  • [68]

    S. D. McDermott, H. Yu, and K. M. Zurek, Phys. Rev. D 83, 063509 (2011), arXiv:1011.2907[hep-ph