22 citations · 25 across the 2 of their papers we have counts for
3 papers
gr-qc2016★ 22 cited
Fine-tuning challenges for the matter bounce scenario
Aaron M. Levy
A bouncing universe with a long period of contraction during which the average density is pressureless (the same equation of state as matter) as cosmologically observable scales ex…
gr-qc2016★ 3 cited
Warm Ekpyrosis
Aaron M. Levy, Gustavo Turiaci
We propose a mechanism to generate a nearly scale-invariant spectrum of adiabatic scalar perturbations about a stable, ekpyrotic background. The key ingredient is a coupling betwee…
astro-ph.CO2015
Scale-invariant perturbations in ekpyrotic cosmologies without fine-tuning of initial conditions
Aaron M. Levy, Anna Ijjas, Paul J. Steinhardt
Ekpyrotic bouncing cosmologies have been proposed as alternatives to inflation. In these scenarios, the universe is smoothed and flattened during a period of slow contraction prece…