200 citations · 2.2k across the 48 of their papers we have counts for
4 papers · 1 filter
Backreaction of axion-SU(2) dynamics during inflation
Oksana Iarygina, Evangelos I. Sfakianakis, Ramkishor Sharma +1
We consider the effects of backreaction on axion-SU(2) dynamics during inflation. We use the linear evolution equations for the gauge field modes and compute their backreaction on…
Gravitational Wave Symphony from Oscillating Spectator Scalar Fields
Yanou Cui, Pankaj Saha, Evangelos I. Sfakianakis
We investigate a generic source of stochastic gravitational wave background due to the parametric resonance of oscillating scalar fields in the early Universe. By systematically an…
Cosmic Birefringence from the Axiverse
Silvia Gasparotto, Evangelos I. Sfakianakis
We revisit the evidence for CMB birefringence in the context of a rich Axiverse. Using probability density functions (PDFs) for various axion parameters, such as the mass and axion…
Oscillon spectroscopy
Fabio van Dissel, Oriol Pujolas, Evangelos Sfakianakis
The sine-Gordon model in 3+1 dimensions is known to admit two oscillons of different energy and frequency but comparable lifetime. We show that the oscillon spectrum includes more…