Results 61 to 70 of about 465 (109)

Cosmic clues: DESI, dark energy, and the cosmological constant problem

Journal of High Energy Physics
Several attempts to solve the cosmological constant problem, which concerns the value of the cosmological constant being extremely smaller than the Standard Model mass scales, have introduced a scalar field with a very flat potential that can be ...
Wen Yin
doaj   +1 more source

BBN photodisintegration constraints on gravitationally produced vector bosons

Journal of High Energy Physics, 2022
Gravitational production of massive particles due to cosmic expansion can be significant during the inflationary and reheating period of the Universe. If the particle also has non-gravitational interactions that do not significantly affect its production,
Chee Sheng Fong, Moinul Hossain Rahat, Shaikh Saad   +2 more
doaj   +1 more source

The quality/cosmology tension for a post-inflation QCD axion

Journal of High Energy Physics
It is difficult to construct a post-inflation QCD axion model that solves the axion quality problem (and hence the Strong CP problem) without introducing a cosmological disaster. In a post-inflation axion model, the axion field value is randomized during
Qianshu Lu, Matthew Reece, Zhiquan Sun
doaj   +1 more source

Self consistent thermal resummation: a case study of the phase transition in 2HDM

Journal of High Energy Physics
An accurate description of the scalar potential at finite temperature is crucial for studying cosmological first-order phase transitions (FOPT) in the early Universe.
Pedro Bittar, Subhojit Roy, Carlos E. M. Wagner   +2 more
doaj   +1 more source

Global structure, non-invertible PQ symmetry, and the DFSZ domain wall problem

Journal of High Energy Physics
In recent years it has become increasingly clear that the previously overlooked “global structure” of symmetry groups can encode significant theoretical structure and, more importantly, have substantial phenomenological implications. With this in mind we
Gongjun Choi, Sungwoo Hong, Seth Koren
doaj   +1 more source

Early vs late string networks from a minimal QCD Axion

Journal of High Energy Physics
We propose a new regime of minimal QCD axion dark matter that lies between the pre- and post-inflationary scenarios, such that the Peccei-Quinn (PQ) symmetry is restored only on sufficiently large spatial scales.
Marco Gorghetto, Edward Hardy, Horia Nicolaescu, Alessio Notari, Michele Redi   +4 more
doaj   +1 more source

Dark Radiation Constraints on Heavy QCD Axions

Journal of High Energy Physics
The naturalness problem of PQ symmetry motivates study of the heavy QCD axion, with masses m a > 1 MeV generated at scales above the QCD scale, and low values of the PQ symmetry breaking scale, f a .
David I. Dunsky, Lawrence J. Hall, Keisuke Harigaya   +2 more
doaj   +1 more source

Bias with a timer: axion domain wall decay and dark matter

Journal of High Energy Physics
We explore the interplay of the post-inflationary QCD axion and a light scalar field for the axion domain wall decay and dark matter (DM). The scalar field possesses a nonzero vacuum expectation value (VEV) during inflation, so that its interaction with ...
Sally Yuxuan Hao, Shota Nakagawa, Yuichiro Nakai, Motoo Suzuki   +3 more
doaj   +1 more source

Detection of early-universe gravitational-wave signatures and fundamental physics. [PDF]

Gen Relativ Gravit, 2022
Caldwell R, Cui Y, Guo HK, Mandic V, Mariotti A, No JM, Ramsey-Musolf MJ, Sakellariadou M, Sinha K, Wang LT, White G, Zhao Y, An H, Bian L, Caprini C, Clesse S, Cline JM, Cusin G, Fornal B, Jinno R, Laurent B, Levi N, Lyu KF, Martinez M, Miller AL, Redigolo D, Scarlata C, Sevrin A, Haghi BSE, Shu J, Siemens X, Steer DA, Sundrum R, Tamarit C, Weir DJ, Xie KP, Yang FW, Zhou S.   +37 more
europepmc   +1 more source

Hybrid inflation, reheating and dark radiation in a IIB perturbative moduli stabilization scenario

Journal of High Energy Physics
We study the cosmological implications of an effective field theory model derived within a configuration of D7 brane stacks in the framework of type-IIB string theory.
Waqas Ahmed, Athanasios Karozas, George K. Leontaris, Ilias Tavellaris   +3 more
doaj   +1 more source