Results 1 to 10 of about 20,695 (167)
Light dark photon dark matter from inflation [PDF]
Journal of High Energy Physics, 2020 We discuss the possibility of producing a light dark photon dark matter through a coupling between the dark photon field and the inflaton. The dark photon with a large wavelength is efficiently produced due to the inflaton motion during inflation and ...
Yuichiro Nakai, Ryo Namba, Ziwei Wang
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Avoided deconfinement in Randall-Sundrum models
Journal of High Energy Physics, 2021 We study first order phase transitions in Randall-Sundrum models in the early universe dual to confinement in large-N gauge theories. The transition rate to the confined phase is suppressed by a factor exp(− N 2), and may not complete for N » 1, instead ...
Prateek Agrawal, Michael Nee
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String fragmentation in supercooled confinement and implications for dark matter
Journal of High Energy Physics, 2021 A strongly-coupled sector can feature a supercooled confinement transition in the early universe. We point out that, when fundamental quanta of the strong sector are swept into expanding bubbles of the confined phase, the distance between them is large ...
Iason Baldes +2 more
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Gravitational waves from dark Yang-Mills sectors
Journal of High Energy Physics, 2021 Dark Yang-Mills sectors, which are ubiquitous in the string landscape, may be reheated above their critical temperature and subsequently go through a confining first-order phase transition that produces stochastic gravitational waves in the early ...
James Halverson +4 more
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Resurrecting low-mass axion dark matter via a dynamical QCD scale
Journal of High Energy Physics, 2021 In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way.
Lucien Heurtier +2 more
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Black hole production of monopoles in the early universe
Journal of High Energy Physics, 2021 In the early universe, evaporating black holes heat up the surrounding plasma and create a temperature profile around the black hole that can be more important than the black hole itself.
Saurav Das, Anson Hook
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Dark moments for the Standard Model?
Journal of High Energy Physics, 2021 If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop ...
Thomas G. Rizzo
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Analytic study of dark photon and gravitational wave production from axion
Journal of High Energy Physics, 2021 Axion-like fields heavier than about 10 −27 eV are expected to oscillate in the radiation dominated epoch when the Hubble parameter drops below their mass.
Borna Salehian +3 more
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Journal of High Energy Physics, 2021 In traditional models only an order one fraction of energy is transferred from the inflaton to radiation through nonperturbative resonance production in preheating immediately after inflation, due to backreaction effects. We propose a particle production
JiJi Fan, Kaloian D. Lozanov, Qianshu Lu
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Thermal QCD Axions across Thresholds
Journal of High Energy Physics, 2021 Thermal axion production in the early universe goes through several mass thresholds, and the resulting rate may change dramatically across them. Focusing on the KSVZ and DFSZ frameworks for the invisible QCD axion, we perform a systematic analysis of ...
Francesco D’Eramo +2 more
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