Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Raymond T. Co"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 9, Pp 1-28 (2024)
Abstract We study the cosmological evolution of a light QCD axion and identify the parameter space to obtain the correct relic dark matter abundance. The axion potential is flattened at the origin, corresponding to the only minimum, while it is unsup
Externí odkaz:
https://doaj.org/article/34f27146b9604d20b9e6ee6348481695
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 7, Pp 1-32 (2023)
Abstract Generating axion dark matter through the kinetic misalignment mechanism implies the generation of large asymmetries for Standard Model fermions in the early universe. Even if these asymmetries are washed out at later times, they can trigger
Externí odkaz:
https://doaj.org/article/73f691ce347d4754949a32b18ba9ff52
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 5, Pp 1-46 (2023)
Abstract If the Peccei-Quinn field containing the QCD axion undergoes rotations in the early universe, the dimension-five operator responsible for neutrino masses can generate a lepton asymmetry that ultimately gives rise to the observed baryon asymm
Externí odkaz:
https://doaj.org/article/1b1d2401e10a4393930d78d2bfa8822b
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 2, Pp 1-27 (2023)
Abstract Heavy QCD axions are well-motivated extensions of the QCD axion that address the quality problem while still solving the strong CP problem. Owing to the gluon coupling, critical for solving the strong CP problem, these axions can be produced
Externí odkaz:
https://doaj.org/article/54d91e393bde42a3b83b0ca7f2358903
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 12, Pp 1-42 (2022)
Abstract We show that a minimal scenario, utilizing only the graviton as an intermediate messenger between the inflaton, the dark sector and the Standard Model (SM), is able to generate simultaneously the observed relic density of dark matter (DM), t
Externí odkaz:
https://doaj.org/article/42ef77e6c30d41acb70865dc14d270c2
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 10, Pp 1-32 (2022)
Abstract We demonstrate that the observed cosmological excess of matter over anti-matter may originate from a heavy QCD axion that solves the strong CP problem but has a mass much larger than that given by the Standard Model QCD strong dynamics. We i
Externí odkaz:
https://doaj.org/article/8a8ed82eb62045f38c733090cc436731
Autor:
Raymond T. Co, David Dunsky, Nicolas Fernandez, Akshay Ghalsasi, Lawrence J. Hall, Keisuke Harigaya, Jessie Shelton
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 9, Pp 1-55 (2022)
Abstract Rotations of an axion field in field space provide a natural origin for an era of kination domination, where the energy density is dominated by the kinetic term of the axion field, preceded by an early era of matter domination. Remarkably, n
Externí odkaz:
https://doaj.org/article/5d2940d8c2c84184bfe0d78b1c58d424
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 12, Pp 1-40 (2021)
Abstract An axion rotating in field space can produce dark photons in the early universe via tachyonic instability. This explosive particle production creates a background of stochastic gravitational waves that may be visible at pulsar timing arrays
Externí odkaz:
https://doaj.org/article/c5366d9bee644a4c819f48187e407944
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 11, Pp 1-40 (2021)
Abstract We show that the rotation of the QCD axion field, aided by B−L violation from supersymmetric R-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field
Externí odkaz:
https://doaj.org/article/60ab90b95e714d8095325d48d6991564
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 3, Pp 1-62 (2021)
Abstract We propose a baryogenenesis mechanism that uses a rotating condensate of a Peccei-Quinn (PQ) symmetry breaking field and the dimension-five operator that gives Majorana neutrino masses. The rotation induces charge asymmetries for the Higgs b
Externí odkaz:
https://doaj.org/article/fb3a895e79f6438884a7725c152c3c91