Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Chatrchyan, Aleksandr"'
Cold New Early Dark Energy (Cold NEDE) addresses the Hubble tension through a triggered vacuum phase transition in the dark sector. In this paper, we constrain a phenomenological fluid model using recent cosmic microwave background likelihoods based
Externí odkaz:
http://arxiv.org/abs/2408.14537
Publikováno v:
PoS - Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T03 Dark Matter
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
Externí odkaz:
http://arxiv.org/abs/2402.10313
Publikováno v:
Phys. Rev. D 109 (2024) 2, 023502
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 state is a well-defined initial-value problem in real time, which can be
Externí odkaz:
http://arxiv.org/abs/2310.04206
Publikováno v:
JCAP10(2023)068
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
Externí odkaz:
http://arxiv.org/abs/2305.03756
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 proposal by Graham, Kaplan and Rajendran, the relaxion abundance today
Externí odkaz:
http://arxiv.org/abs/2211.15694
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 field, the relaxion. We investigate the regime where the relaxion is
Externí odkaz:
http://arxiv.org/abs/2210.01148
Autor:
Chatrchyan, Aleksandr, Geier, Kevin T., Oberthaler, Markus K., Berges, Jürgen, Hauke, Philipp
Publikováno v:
Phys. Rev. A 104, 023302 (2021)
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 propose to quantum-simulate the reheating-like dynamics of a generic c
Externí odkaz:
http://arxiv.org/abs/2008.02290
Autor:
Chatrchyan, Aleksandr, Jaeckel, Joerg
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 matter candidate. However, in certain cases, such as in the presence of
Externí odkaz:
http://arxiv.org/abs/2004.07844
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 matter also at larger couplings to the Standard Model particles. The p
Externí odkaz:
http://arxiv.org/abs/1903.03116
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