36 citations · 174 across the 8 of their papers we have counts for
8 papers
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…
Real-time dynamics of false vacuum decay
Laura Batini, Aleksandr Chatrchyan, Jürgen Berges
We investigate false vacuum decay of a relativistic scalar field initialized in the metastable minimum of an asymmetric double-well potential. The transition to the true ground sta…
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…
Relaxion Dark Matter from Stochastic Misalignment
Aleksandr Chatrchyan, Géraldine Servant
Cosmological relaxation of the electroweak scale via Higgs-axion interplay, named as relaxion mechanism, provides a dynamical solution to the Higgs mass hierarchy. In the original…
The Stochastic Relaxion
Aleksandr Chatrchyan, Géraldine Servant
We revisit the original proposal of cosmological relaxation of the electroweak scale by Graham, Kaplan and Rajendran in which the Higgs mass is scanned during inflation by an axion…
Analog cosmological reheating in an ultracold Bose gas
Aleksandr Chatrchyan, Kevin T. Geier, Markus K. Oberthaler +2
Cosmological reheating describes the transition of the post-inflationary universe to a hot and thermal state. In order to shed light on the underlying dynamics of this process, we…
Gravitational waves from the fragmentation of axion-like particle dark matter
Aleksandr Chatrchyan, Joerg Jaeckel
The misalignment mechanism allows for the efficient, and usually very cold, production of light scalar bosons, such as axion-like particles (ALPs), making them an appealing dark ma…
Foamy Dark Matter from Monodromies
Jürgen Berges, Aleksandr Chatrchyan, Joerg Jaeckel
We investigate the dynamics of axion-like particle (ALP) dark matter where the field range is enlarged by a monodromy. The monodromy potential allows sufficient production of dark…