Results 61 to 70 of about 430 (123)

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

Spacetime evolution during moduli stabilization in radiation dominated era beyond 4D effective theory

Journal of High Energy Physics, 2022
We investigate the time evolution of the background spacetime during the moduli stabilization process, which is assumed to occur in the radiation dominated era. The setup is basically the Salam-Sezgin model, but we add a potential term for the dilaton in
Hajime Otsuka, Yutaka Sakamura
doaj   +1 more source

Large spin-2 signals at the cosmological collider

Journal of High Energy Physics, 2022
We study the theory and phenomenology of massive spin-2 fields during the inflation with nonzero background chemical potential, and extend the cosmological collider physics to tensor modes.
Xi Tong, Zhong-Zhi Xianyu
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

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

Unveiling fundamental physics with high-resolution X-ray spectroscopy of Active Galactic Nuclei.

This doctoral thesis explores the use of high-resolution spectroscopy of active galactic nuclei (AGNs) to probe fundamental physics. It focuses on the study of axion-like particles (ALPs) and the spin of supermassive black holes (SMBHs).

core   +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

Collider and CMB complementarity of leptophilic dark matter with light Dirac neutrinos

Journal of High Energy Physics
We study the discovery prospects of leptophilic dark matter (DM) in future lepton colliders by considering the light neutrinos to be of Dirac type. Adopting an effective field theory (EFT) approach, we write down dimension six operators connecting the ...
Debasish Borah, Nayan Das, Sahabub Jahedi, Bhavya Thacker   +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