Results 1 to 10 of about 21,268 (194)

Light dark photon dark matter from inflation [PDF]

open access: yesJournal 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
doaj   +2 more sources

Non-metric geometry as the origin of mass in gauge theories of scale invariance [PDF]

open access: yesThe European Physical Journal C, 2022
We discuss gauge theories of scale invariance beyond the Standard Model (SM) and Einstein gravity. A consequence of gauging this symmetry is that their underlying 4D geometry is non-metric ( $$\nabla _\mu g_{\alpha \beta }\!\not =\!0$$ ∇ μ g α β ≠ 0 ...
D. Ghilencea
semanticscholar   +1 more source

Axion-like particles as mediators for dark matter: beyond freeze-out [PDF]

open access: yesJournal of High Energy Physics, 2022
We consider an axion-like particle (ALP) coupled to Standard Model (SM) fermions as a mediator between the SM and a fermionic dark matter (DM) particle.
A. Bharucha, Nishita, Desai, S. Mutzel
semanticscholar   +1 more source

Can we explain cosmic birefringence without a new light field beyond Standard Model? [PDF]

open access: yesJournal of High Energy Physics, 2023
The recent analysis of the Planck 2018 polarization data shows a nonzero isotropic cosmic birefringence (ICB) that is not explained within the ΛCDM paradigm.
Yuichiro Nakai   +4 more
semanticscholar   +1 more source

Euclid preparation. XLIV. Modelling spectroscopic clustering on mildly nonlinear scales in beyond-LCDM models [PDF]

open access: yesAstronomy & Astrophysics, 2023
The space satellite mission will measure the large-scale clustering of galaxies at an unprecedented precision, providing a unique probe of modifications to the Lambda CDM model.
Euclid Collaboration B. Bose   +499 more
semanticscholar   +1 more source

Gravitational waves from dark Yang-Mills sectors

open access: yesJournal 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
doaj   +1 more source

Inflation in symmergent metric-Palatini gravity [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2023
In this paper, we study the cosmological inflation phenomenon in symmergent gravity theory. Symmergent gravity is a novel framework which merges gravity and the standard model (SM) so that the gravity emerges from the matter loops and restores the broken
N. Bostan, Canan Karahan, Ozan Sargın
semanticscholar   +1 more source

Avoided deconfinement in Randall-Sundrum models

open access: yesJournal 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
doaj   +1 more source

String fragmentation in supercooled confinement and implications for dark matter

open access: yesJournal 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
doaj   +1 more source

Resurrecting low-mass axion dark matter via a dynamical QCD scale

open access: yesJournal 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
doaj   +1 more source

Home - About - Disclaimer - Privacy