Relaxion dark matter
Nayara Fonseca,Enrico Morgante +1 more
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In this article, the authors highlight a connection between the Standard Model hierarchy problem and the dark matter sector and show that the relaxion is a phenomenologically viable dark matter candidate in the kilo-electron-volt mass range.Abstract:
We highlight a new connection between the Standard Model hierarchy problem and the dark matter sector. The key piece is the relaxion field, which besides scanning the Higgs mass and setting the electroweak scale also constitutes the observed dark matter abundance of the Universe. The relaxation mechanism is realized during inflation, and the necessary friction is provided by particle production. Using this framework, we show that the relaxion is a phenomenologically viable dark matter candidate in the kilo-electron-volt mass range.read more
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Coherent relaxion dark matter
TL;DR: In this paper, it was shown that the relaxion, which addresses the hierarchy problem, can account for the observed dark matter (DM) relic density, when the temperature is well above the electroweak scale, the backreaction potential disappears, and the relaxions is displaced from its vacuum.
Posted Content
Axion Fragmentation
TL;DR: In this article, the authors investigate the production of axion quanta during the early universe evolution of an axion-like field rolling down a wiggly potential and compute the growth of quantum fluctuations and their back-reaction on the homogeneous zero-mode.
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Collider searches of scalar singlets across lifetimes
TL;DR: In this paper, the generic scalar singlet and the relaxion of the scalar singlets are compared, and a matching as well as qualitative differences between them are derived.
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Relaxion fluctuations (self-stopping relaxion) and overview of relaxion stopping mechanisms
TL;DR: In this paper, the effect of quantum fluctuations of the homogeneous relaxion field has been considered, and it has been shown that the resulting production of relaxion particles can act as an efficient stopping mechanism for the relaxion.
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Collider searches for scalar singlets across lifetimes
TL;DR: In this paper, the authors investigate bounds from Higgs decays into a pair of singlets, considering signatures of invisible decays, displaced and delayed jets, and coupling fits of untagged decays.
References
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The Not So Harmless Axion
Michael Dine,Willy Fischler +1 more
TL;DR: In this paper, an upper bound on the axion decay constant of at most 1012 GeV is given, assuming that axions do not dominate the present energy density of the universe.
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TL;DR: In this paper, an analysis of the Lyman-$\ensuremath{\alpha}$ flux power spectrum measured from high-resolution spectra of 25 $zg4$ quasars obtained with the Keck High Resolution Echelle Spectrometer and the Magellan Inamori Kyocera Echeline spectrograph is presented.
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Coherent scalar-field oscillations in an expanding universe
TL;DR: In this article, the cosmological importance of coherent scalar field oscillations in the context of the invisible axion and the new inflationary-universe scenario was analyzed.
Journal ArticleDOI
Cosmological Relaxation of the Electroweak Scale
TL;DR: A new class of solutions to the electroweak hierarchy problem is presented that does not require either weak-scale dynamics or anthropics to be presented.