[293] U. H. Danielsson, Phys. Rev. D66 , 023511 (2002), hep-th/0203198. [294] N. Kaloper, M. Kleban, A. Lawrence, S. Shenker, and L. Susskind, JHEP 11 , 037 (2002), hep-th/0209231. [295] J. Martin and R. Brandenberger, Phys. Rev. D68 , 063513 (2003), hep-th/0305161. [296] H. Collins and R. Holman (2005), hep-th/0507081. [297] T. S. Bunch and P. C. W. Davies, Proc. Roy. Soc. Lond. A357 , 381 (1977). [298] C. P. Burgess, J. M. Cline, F. Lemieux, and R. Holman, JHEP 02 , 048 (2003), hep- th/0210233. [299] D. Boyanovsky, H. J. de Vega, and N. G. Sanchez, Phys. Rev. D72 , 103006 (2005), astro- ph/0507596. [300] D. Boyanovsky, H. J. de Vega, and N. G. Sanchez, Phys. Rev. D74 , 123006 (2006), astro- ph/0607508. [301] R. H. Brandenberger, R. Laflamme, and M. Mijic, Mod. Phys. Lett. A5 , 2311 (1990). [302] D. Polarski and A. A. Starobinsky, Class. Quant. Grav. 13 , 377 (1996), gr-qc/9504030. [303] J. Lesgourgues, D. Polarski, and A. A. Starobinsky, Nucl. Phys. B497 , 479 (1997), gr- qc/9611019. [304] C. Kiefer, D. Polarski, and A. A. Starobinsky, Int. J. Mod. Phys. D7 , 455 (1998), gr- qc/9802003. [305] P. Martineau, Class. Quant. Grav. 24 , 5817 (2007), astro-ph/0601134. [306] C. P. Burgess, R. Holman, and D. Hoover, Phys. Rev. D77 , 063534 (2008), astro-ph/0601646. [307] C. Kiefer and D. Polarski (2008), 0810.0087. [308] J. F. Koksma, T. Prokopec, and M. G. Schmidt (2009), 0910.5733. [309] J. R. Ellis, J. E. Kim, and D. V. Nanopoulos, Phys. Lett. B145 , 181 (1984). [310] T. Moroi, H. Murayama, and M. Yamaguchi, Phys. Lett. B303 , 289 (1993). [311] T. Moroi (1995), hep-ph/9503210. [312] M. Bolz, A. Brandenburg, and W. Buchmuller, Nucl. Phys. B606 , 518 (2001), hep- ph/0012052. [313] M. Kawasaki, K. Kohri, and T. Moroi, Phys. Lett. B625 , 7 (2005), astro-ph/0402490. [314] M. Kawasaki, K. Kohri, and T. Moroi, Phys. Rev. D71 , 083502 (2005), astro-ph/0408426. [315] K. Kohri, A. Mazumdar, and N. Sahu (2009), 0905.1625. [316] A. Mazumdar, R. N. Mohapatra, and A. Perez-Lorenzana, JCAP 0406 , 004 (2004), hep- 252