Results 21 to 30 of about 375 (91)

Slow-roll inflation in Palatini F(R) gravity

Journal of High Energy Physics, 2022
We study single field slow-roll inflation in the presence of F(R) gravity in the Palatini formulation. In contrast to metric F(R), when rewritten in terms of an auxiliary field and moved to the Einstein frame, Palatini F(R) does not develop a new ...
Christian Dioguardi, Antonio Racioppi, Eemeli Tomberg   +2 more
doaj   +1 more source

Phase information in cosmological collider signals

Journal of High Energy Physics, 2022
Massive particles produced during the cosmic inflation can imprint in the primordial non-Gaussianities as characteristic oscillating functions of various momentum ratios, known as cosmological collider signals.
Zhehan Qin, Zhong-Zhi Xianyu
doaj   +1 more source

Dynamical prevention of topological defect formation

Journal of High Energy Physics
Topological defects can have significant cosmological consequences, so their production must be examined carefully. It is usually assumed that topological defects are produced if the temperature becomes sufficiently high, but in reality their formation ...
Junseok Lee, Kai Murai, Kazunori Nakayama, Fuminobu Takahashi   +3 more
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Axionlike particle-assisted supercooling chiral phase transition in QCD: identifying Coleman-Weinberg type-chiral phase transition in QCD-like scenarios

Journal of High Energy Physics
We propose a new scenario to realize the Coleman-Weinberg (CW) type chiral phase transition in the QCD thermal history. This scenario predicts a heavy axionlike particle (ALP) with mass ~ 5 MeV, consistently with the current experimental and cosmological
Zheng-liang Jiang, Yuepeng Guan, Mamiya Kawaguchi, Shinya Matsuzaki, Akio Tomiya, He-Xu Zhang   +5 more
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Non-linear stability of α′-corrected Friedmann equations

Journal of High Energy Physics, 2023
We study the non-linear stability of fixed-point solutions to the α′-exact equations from O(d, d) invariant cosmology, with and without matter perturbations.
Heliudson Bernardo, Jan Chojnacki, Vincent Comeau   +2 more
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

Cosmological phase transitions in composite Higgs models

Journal of High Energy Physics, 2023
We investigate cosmological phase transitions in various composite Higgs models consisting of four-dimensional asymptotically-free gauge field theories. Each model may lead to a confinement-deconfinement transition and a phase transition associated with ...
Kohei Fujikura, Yuichiro Nakai, Ryosuke Sato, Yaoduo Wang   +3 more
doaj   +1 more source

Ultra-relativistic bubbles from the simplest Higgs portal and their cosmological consequences

Journal of High Energy Physics, 2022
We analyze phase transitions in the minimal extension of the SM with a real singlet scalar field. The novelty of our study is that we identify and analyze in detail the region of parameter space where the first order phase transition can occur and in ...
Aleksandr Azatov, Giulio Barni, Sabyasachi Chakraborty, Miguel Vanvlasselaer, Wen Yin   +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

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