Thermal Tachyacoustic Cosmology

Understand

An intriguing possibility that can address pathologies in both early universe cosmology (i.e.

• the horizon problem) and quantum gravity (i.e.
• non-renormalizability), is that particles at very high energies and/or temperatures could propagate arbitrarily fast.
• A concrete realization of this possibility for the early universe is the Tachyacoustic (or Speedy Sound) cosmology, which could also produce a scale-invariant spectrum for scalar cosmological perturbations.