- 
								[1]
								J. M. Bardeen, Phys. Rev. D, 22:1882(1980) 
- 
								[2]
								H. Kodama and M. Sasaki, Prog. Theor. Phys. Suppl., 78:1(1984) 
- 
								[3]
								V. F. Mukhanov, H. A. Feldman, and R. H. Brandenberger, Phys. Rept., 215:203(1992) 
- 
								[4]
								C. P. Ma and E. Bertschinger, Astrophys. J., 455:7(1995)[astro-ph/9506072]. 
- 
								[5]
								G. F. R. Ellis and M. Bruni, Phys. Rev. D, 40:1804(1989) 
- 
								[6]
								G. F. R. Ellis, J. Hwang, and M. Bruni, Phys. Rev. D, 40:1819(1989) 
- 
								[7]
								M. Bruni, P. K. S. Dunsby, and G. F. R. Ellis, Astrophys. J., 395:34(1992) 
- 
								[8]
								P. K. S. Dunsby, M. Bruni, and G. F. R. Ellis, Astrophys. J., 395:54(1992) 
- 
								[9]
								Ehlers, J. (1961). Abh. Mainz Akad. Wiss. u. Litt. Math. Nat. kl, 11 
- 
								[10]
								S. W. Hawking, Astrophys. J., 145:544(1966) 
- 
								[11]
								G. F. R. Ellis, Gen. Rel. Grav., 41:581(2009)[Proc. Int. Sch. Phys. Fermi, 47:104(1971)] 
- 
								[12]
								J. M. Stewart and M. Walker, Proc. Roy. Soc. Lond. A, 341:49(1974) 
- 
								[13]
								A. Challinor and A. Lasenby, Astrophys. J., 513:1(1999)[astro-ph/9804301] 
- 
								[14]
								W. Hu, astro-ph/0402060 
- 
								[15]
								S. D. P. Vitenti, F. T. Falciano, and N. Pinto-Neto, Phys. Rev. D, 89(10):103538(2014)[arXiv:1311.6730[astro-ph.CO]] 
- 
								[16]
								B. Osano, C. Pitrou, P. Dunsby, J. P. Uzan, and C. Clarkson, JCAP, 0704:003(2007)[gr-qc/0612108] 
- 
								[17]
								C. Brans and R. H. Dicke, Phys. Rev., 124:925(1961) 
- 
								[18]
								T. P. Sotiriou and V. Faraoni, Rev. Mod. Phys., 82:451(2010)[arXiv:0805.1726[gr-qc]] 
- 
								[19]
								S. Nojiri, S. D. Odintsov, and V. K. Oikonomou, Phys. Rept., 692:1(2017)[arXiv:1705.11098[gr-qc]] 
- 
								[20]
								A. Nicolis, R. Rattazzi, and E. Trincherini, Phys. Rev. D, 79:064036(2009)[arXiv:0811.2197[hep-th]] 
- 
								[21]
								C. Deffayet, G. Esposito-Farese, and A. Vikman, Phys. Rev. D, 79:084003(2009)[arXiv:0901.1314[hep-th]] 
- 
								[22]
								C. Deffayet, X. Gao, D. A. Steer, and G. Zahariade, Phys. Rev. D, 84:064039(2011)[arXiv:1103.3260[hep-th]] 
- 
								[23]
								R. Catena, M. Pietroni, and L. Scarabello, Phys. Rev. D, 76:084039(2007)[astro-ph/0604492] 
- 
								[24]
								T. Chiba and M. Yamaguchi, JCAP, 1310:040(2013)[arXiv:1308.1142[gr-qc]] 
- 
								[25]
								J. -O. Gong, J. -c. Hwang, W. -I. Park, M. Sasaki, and Y. -S. Song, JCAP, 1109:023(2011)[arXiv:1107.1840[gr-qc]] 
- 
								[26]
								T. Chiba and M. Yamaguchi, JCAP 0810 (2008) 021[arXiv:0807.4965[astro-ph]]. 
- 
								[27]
								T. Prokopec and J. Weenink, JCAP, 1309:027(2013)[arXiv:1304.6737[gr-qc]] 
- 
								[28]
								T. Kubota, N. Misumi, W. Naylor, and N. Okuda, JCAP, 1202:034(2012)[arXiv:1112.5233[gr-qc]] 
- 
								[29]
								J. M. Bardeen, P. J. Steinhardt, and M. S. Turner, Phys. Rev. D, 28:679(1983) 
- 
								[30]
								F. L. Bezrukov and M. Shaposhnikov, Phys. Lett. B, 659:703(2008)[arXiv:0710.3755[hep-th]] 
- 
								[31]
								M. Li, Phys. Lett. B, 736:488(2014)[arXiv:1405.0211[hep-th]] 
- 
								[32]
								Y. S. Piao, arXiv:1109.4266; arXiv:1112.3737 
- 
								[33]
								T. Qiu, JCAP, 1206:041(2012)[arXiv:1204.0189[hep-ph]] 
- 
								[34]
								G. Domnech and M. Sasaki, JCAP, 1504(04):022(2015)[arXiv:1501.07699[gr-qc]] 
- 
								[35]
								M. Postma and M. Volponi, Phys. Rev. D, 90(10):103516(2014)[arXiv:1407.6874[astro-ph.CO]] 
- 
								[36]
								L. Jrv, P. Kuusk, M. Saal, and O. Vilson, Phys. Rev. D, 91(2):024041(2015)[arXiv:1411.1947[gr-qc]] 
- 
								[37]
								G. Domnech and M. Sasaki, Int. J. Mod. Phys. D, 25(13):1645006(2016)[arXiv:1602.06332[gr-qc]] 
- 
								[38]
								Y. Cai and Y. S. Piao, JHEP, 1603:134(2016)[arXiv:1601.07031[hep-th]] 
- 
								[39]
								C. Wetterich, JCAP, 1605:041(2016)[arXiv:1511.03530[gr-qc]] 
- 
								[40]
								M. Li, Int. J. Mod. Phys. D, 26(01):1740005(2016) doi:10.1142/S0218271817400053 
- 
								[41]
								Y. Cai, Y. T. Wang, and Y. S. Piao, Phys. Rev. D, 93(6):063005(2016)[arXiv:1510.08716[astro-ph.CO]] 
- 
								[42]
								S. Bahamonde, S. D. Odintsov, V. K. Oikonomou, and P. V. Tretyakov, Phys. Lett. B, 766:225(2017)[arXiv:1701. 02381[gr-qc]] 
- 
								[43]
								S. Bahamonde, S. D. Odintsov, V. K. Oikonomou, and M. Wright, Annals Phys., 373:96(2016)[arXiv:1603.05113[gr-qc]] 
- 
								[44]
								M. Li and Y. Mou, JCAP, 1510(10):037(2015)[arXiv:1505.04074[gr-qc]] 
- 
								[45]
								D. Langlois and F. Vernizzi, Phys. Rev. Lett., 95:091303(2005)[astro-ph/0503416] 
- 
								[46]
								D. Langlois and F. Vernizzi, Phys. Rev. D, 72:103501(2005)[astro-ph/0509078] 
- 
								[47]
								C. Gordon, D. Wands, B. A. Bassett, and R. Maartens, Phys. Rev. D, 63:023506(2001)[astro-ph/0009131] 
- 
								[48]
								M. Li, Phys. Lett. B, 724:192(2013)[arXiv:1306.0191[hep-th]] 
- 
								[49]
								T. Qiu and J. Q. Xia, Phys. Lett. B, 744:273(2015)[arXiv:1406.5902[astro-ph.CO]]