Thermal Tachyacoustic Cosmology

@article{Agarwal2014ThermalTC,
  title={Thermal Tachyacoustic Cosmology},
  author={Abhineet Agarwal and Niayesh Afshordi},
  journal={Physical Review D},
  year={2014},
  volume={90},
  pages={043528}
}
Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, ON, N2L 2Y5, Canada(Dated: June 5, 2014)An intriguing possibility that can address pathologies in both early universe cosmology (i.e. thehorizon problem) and quantum gravity (i.e. non-renormalizability), is that particles at very highenergies and/or temperatures could propagate arbitrarily fast. A concrete realization of this pos-sibility for the early universe is the Tachyacoustic (or Speedy Sound) cosmology, which… 

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References

SHOWING 1-10 OF 13 REFERENCES
I and J
A and V
and M
  • Sasaki,
  • 2014
and C
  • Vafa, Phys.Rev.Lett. 97, 021302
  • 2006
JCAP 1111
  • 049
  • 2011
JCAP 0312
  • 002
  • 2003
arXiv:1403.3985 [astro-ph.CO
  • (BICEP2 Collaboration),
  • 2014
and C
  • R. Contaldi, Class.Quant.Grav. 24, 3691
  • 2007
arXiv:1303.5076 [astro-ph.CO
  • (Planck Collaboration),
  • 2013
and R
  • H. Brandenberger, Phys.Rept. 215, 203
  • 1992
...
...