29 citations · 70 across the 8 of their papers we have counts for
7 papers · 1 filter
Amnesia in the Axion Misalignment Landscape
Kierthika Chathirathas, Cem Eröncel, Mathieu Kaltschmidt +2
Pre-inflationary axion cosmologies admit a broad range of initial velocities and angles that generate a landscape of misalignment histories, whose nonlinear fate and small-scale st…
Enhanced primordial gravitational waves from a stiff post-inflationary era due to an oscillating inflaton
Chao Chen, Konstantinos Dimopoulos, Cem Eröncel +1
We investigate two classes of inflationary models, which lead to a stiff period after inflation that boosts the signal of primordial gravitational waves (GWs). In both families of…
Gravitational signatures of ALP dark matter fragmentation
Aleksandr Chatrchyan, Cem Eröncel, Matthias Koschnitzke +1
The misalignment mechanism for axion-like particles (ALPs) is a leading explanation for dark matter. In this work we investigate ALPs with non-periodic potentials, which allow for…
New Horizons in the Holographic Conformal Phase Transition
Cem Eröncel, Jay Hubisz, Seung. J. Lee +2
We describe cosmological solutions of the holographic dilaton with the aim of exploring alternatives to the commonly studied thermal Randall-Sundrum phase transition. It is well kn…
ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures
Aleksandr Chatrchyan, Cem Eröncel, Matthias Koschnitzke +1
Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosi…
ALP Dark Matter Mini-Clusters from Kinetic Fragmentation
Cem Eröncel, Géraldine Servant
We show that very compact axion mini-clusters can form in models where axion-like-particle (ALP) dark matter is produced via the kinetic misalignment mechanism, which is well-motiv…
ALP Dark Matter from Kinetic Fragmentation: Opening up the Parameter Window
Cem Eröncel, Ryosuke Sato, Geraldine Servant +1
The main mechanism responsible for Axion-Like-Particle (ALP) production in the early universe is the so-called misalignment mechanism. Three regimes have been investigated in this…