- 
								[1]
								P. Horava, Phys. Rev. D, 79: 084008 (2009), arXiv:0901.3775 [hep-th 
- 
								[2]
								P. Horava, JHEP, 0903: 020 (2009), arXiv:0812.4287 [hep-th 
- 
								[3]
								P. Horava, Phys. Lett. B, 694: 172 (2010), arXiv:0811.2217 [hep-th 
- 
								[4]
								P. Horava, Phys. Rev. Lett., 102: 161301 (2009), arXiv:0902.3657 [hep-th 
- 
								[5]
								A. Volovich and C. Wen, JHEP, 0905: 087 (2009), arXiv:0903.2455 [hep-th 
- 
								[6]
								A. Jenkins, Int. J. Mod. Phys. D, 18: 2249 (2009), arXiv:0904.0453 [gr-qc 
- 
								[7]
								E. Kiritsis and G. Kofinas, Nucl. Phys. B, 821: 467 (2009), arXiv:0904.1334 [hep-th 
- 
								[8]
								T. Takahashi and J. Soda, Phys. Rev. Lett., 102: 231301 (2009), arXiv:0904.0554 [hep-th 
- 
								[9]
								G. Calcagni, JHEP, 0909: 112 (2009), arXiv:0904.0829 [hep-th 
- 
								[10]
								S. Mukohyama, JCAP, 0906: 001 (2009), arXiv:0904.2190 [hep-th 
- 
								[11]
								R. Brandenberger, Phys. Rev. D, 80: 043516 (2009), arXiv:0904.2835 [hep-th 
- 
								[12]
								H. Lu, J. Mei, and C. Pope, Phys. Rev. Lett., 103: 091301 (2009), arXiv:0904.1595 [hep-th 
- 
								[13]
								Y.-S. Piao, Phys. Lett. B, 681: 1 (2009), arXiv:0904.4117 [hep-th 
- 
								[14]
								H. Nikolic, Mod. Phys. Lett. A, 25: 1595 (2010), arXiv:0904.3412 [hep-th 
- 
								[15]
								H. Nastase, (2009), arXiv: 0904.3604 [hep-th]. 
- 
								[16]
								R.-G. Cai, L.-M. Cao, and N. Ohta, Phys. Rev. D, 80: 024003 (2009), arXiv:0904.3670 [hep-th 
- 
								[17]
								R.-G. Cai, Y. Liu, and Y.-W. Sun, JHEP, 0906: 010 (2009), arXiv:0904.4104 [hep-th 
- 
								[18]
								B. Chen and Q.-G. Huang, Phys. Lett. B, 683: 108 (2010), arXiv:0904.4565 [hep-th 
- 
								[19]
								S. Mukohyama, Class. Quant. Grav., 27: 223101 (2010), arXiv:1007.5199 [hep-th 
- 
								[20]
								A. Wang, Int. J. Mod. Phys. D, 26: 1730014 (2017), arXiv:1701.06087 [gr-qc 
- 
								[21]
								N. Aghanim et al (Planck), (2018), arXiv: 1807.06209 [astro-ph.CO]. 
- 
								[22]
								Y. Huang and A. Wang, Phys. Rev. D, 86: 103523 (2012), arXiv:1209.1624 [hep-th 
- 
								[23]
								Y. Huang, A. Wang, and R. Yousefi et al, Phys. Rev. D, 88: 023523 (2013), arXiv:1304.1556 [hep-th 
- 
								[24]
								X. Gao, Phys. Rev. D, 90: 081501 (2014), arXiv:1406.0822 [gr-qc 
- 
								[25]
								X. Gao, Phys. Rev. D, 90: 104033 (2014), arXiv:1409.6708 [gr-qc 
- 
								[26]
								X. Gao and Z.-b. Yao, (2018), arXiv: 1806.02811 [gr-qc]. 
- 
								[27]
								J. M. Maldacena, JHEP, 0305: 013 (2003), arXiv:astro-ph/0210603 [astro-ph 
- 
								[28]
								N. Bartolo, E. Komatsu, and S. Matarrese et al, Phys.Rept., 402: 103 (2004), arXiv:astro-ph/0406398 [astro-ph 
- 
								[29]
								D. Seery and J. E. Lidsey, JCAP, 0506: 003 (2005), arXiv:astro-ph/0503692 [astro-ph 
- 
								[30]
								X. Chen, M.-x. Huang, and S. Kachru et al, JCAP, 0701: 002 (2007), arXiv:hep-th/0605045 [hep-th 
- 
								[31]
								X. Chen, M.-x. Huang, and G. Shiu, Phys. Rev. D, 74: 121301 (2006), arXiv:hep-th/0610235 [hep-th 
- 
								[32]
								F. Arroja and K. Koyama, Phys. Rev. D, 77: 083517 (2008), arXiv:0802.1167 [hep-th 
- 
								[33]
								D. Seery and J. E. Lidsey, JCAP, 0509: 011 (2005), arXiv:astro-ph/0506056 [astro-ph 
- 
								[34]
								D. Langlois, S. Renaux-Petel, and D. A. Steer et al, Phys. Rev. D, 78: 063523 (2008), arXiv:0806.0336 [hep-th 
- 
								[35]
								D. Langlois, S. Renaux-Petel, and D. A. Steer et al, Phys. Rev. Lett., 101: 061301 (2008), arXiv:0804.3139 [hep-th 
- 
								[36]
								F. Arroja, S. Mizuno, and K. Koyama, JCAP, 0808: 015 (2008), arXiv:0806.0619[astro-ph 
- 
								[37]
								X. Gao, JCAP, 0806: 029 (2008), arXiv:0804.1055 [astro-ph 
- 
								[38]
								X. Gao and B. Hu, JCAP, 0908: 012 (2009), arXiv:0903.1920 [astro-ph.CO 
- 
								[39]
								J. Martin and R. H. Brandenberger, Phys. Rev. D, 63: 123501 (2001), arXiv:hep-th/0005209 [hep-th 
- 
								[40]
								R. H. Brandenberger and J. Martin, Mod. Phys. Lett. A, 16: 999 (2001), arXiv:astro-ph/0005432 [astro-ph 
- 
								[41]
								A. A. Starobinsky, Pisma Zh. Eksp. Teor. Fiz., 73: 415 (2001), arXiv:astro-ph/0104043 [astro-ph 
- 
								[42]
								J. Martin and R. H. Brandenberger, Phys. Rev. D, 65: 103514 (2002), arXiv:hep-th/0201189 [hep-th 
- 
								[43]
								X. Gao, Phys. Lett. B, 702: 12 (2011), arXiv:0903.1412 [astro-ph.CO