Accès ouvert
2026
article
OpenAlex
Nabeen Bhusal, Simone Blasi, Martina Cataldi, Aleksandr Chatrchyan et autres
We compute for the first time baryon number violation at zero temperature from Higgs bubble collisions and find that it can be of the same order as that from thermal sphalerons in the symmetric phase at electroweak temperatures. We study the dependence …
de, cn, se
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Cem Eröncel, Yann Gouttenoire, Ryosuke Sato, Géraldine Servant et autres
We discuss a novel mechanism for generating dark matter from a fast-rolling scalar field, relevant for both inflation and rotating axion models, and apply it specifically to the (QCD) axion. Dark matter comes from scalar field fluctuations generated by the product of …
tr, il, de, jp, cn, es, th
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Cem Eröncel, Ryosuke Sato, Géraldine Servant, Philip Sørensen
Abstract The axion kinetic misalignment mechanism (KMM) opens the possibility of explaining dark matter for almost any axion mass and decay constant that is not accessible by the standard misalignment mechanism, in particular at low values of the axion decay constant (i.e. …
tr, jp, de, ch, it
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Cem Eröncel, Yann Gouttenoire, Ryosuke Sato, Géraldine Servant et autres
We show that primordial adiabatic curvature fluctuations generate an instability of the scalar field sourcing a kination era. We demonstrate that the generated higher Fourier modes constitute a radiationlike component dominating over the kination background after about 11 e-folds of cosmic expansion. …
tr, il, de, jp, cn, es
(code pays fourni par la source)
Accès ouvert
2025
preprint
OpenAlex
Cem Eröncel, Yann Gouttenoire, Ryosuke Sato, Géraldine Servant et autres
We show that primordial adiabatic curvature fluctuations generate an instability of the scalar field sourcing a kination era. We demonstrate that the generated higher Fourier modes constitute a radiation-like component dominating over the kination background after about $11$ e-folds of cosmic expansion. …
de
(code pays fourni par la source)
Accès ouvert
2024
article
OpenAlex
Géraldine Servant, Peera Simakachorn
We investigate gravitational-wave backgrounds (GWBs) of primordial origin that would manifest only at ultrahigh frequencies, from kilohertz to 100 gigahertz, and leave no signal at LIGO, the Einstein Telescope, the Cosmic Explorer, LISA, or pulsar-timing arrays. We focus on GWBs produced by …
de, ch, es
(code pays fourni par la source)
Accès ouvert
2024
conference-paper
OpenAlex
Matthias Koschnitzke, Aleksandr Chatrchyan, Cem Eröncel, Géraldine Servant
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 large misalignment of the field from the minimum and make it possible for ALPs to match …
de, se, tr
(code pays fourni par la source)
Accès ouvert
2024
preprint
OpenAlex
Cem Eröncel, Ryosuke Sato, Géraldine Servant, Philip Sørensen
The axion kinetic misalignment mechanism (KMM) opens the possibility of explaining dark matter for almost any axion mass and decay constant that is not accessible by the standard misalignment mechanism, in particular at low values of the axion decay constant (i.e. large …
de
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Benedict von Harling, Oleksii Matsedonskyi, Géraldine Servant
Abstract Electroweak Baryogenesis (EWBG) paired with the Composite Higgs (CH) scenario provides a well-motivated and testable framework for addressing the questions of the origin of the matter-antimatter asymmetry and the naturalness of the electroweak scale. The appeal of both concepts however experiences …
es, gb, de
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Géraldine Servant, Peera Simakachorn
Models that produce axionlike particles (ALPs) after cosmological inflation due to spontaneous $U(1)$ symmetry breaking also produce cosmic-string networks. Those axionic strings lose energy through gravitational-wave emission during the whole cosmological history, generating a stochastic background of gravitational waves that spans many …
de, es
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Aleksandr Chatrchyan, Cem Eröncel, Matthias Koschnitzke, Géraldine Servant
Abstract 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 cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with non-periodic potentials, which …
de, tr
(code pays fourni par la source)
Accès ouvert
2023
article
OpenAlex
Pierre Auclair, David Bacon, Tessa Baker, Tiago Barreiro et autres
Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and particle physics, from the MeV to the …
fr, gb, pt, it, nl, us, il, es, be, ca, ch, fi, au, br, in, cn, gr, de, pl, no, ge, cz, ua
(code pays fourni par la source)