Results 71 to 80 of about 430 (123)

The deep space quantum link: prospective fundamental physics experiments using long-baseline quantum optics. [PDF]

EPJ Quantum Technol, 2022
Mohageg M, Mazzarella L, Anastopoulos C, Gallicchio J, Hu BL, Jennewein T, Johnson S, Lin SY, Ling A, Marquardt C, Meister M, Newell R, Roura A, Schleich WP, Schubert C, Strekalov DV, Vallone G, Villoresi P, Wörner L, Yu N, Zhai A, Kwiat P.   +21 more
europepmc   +1 more source

Towards a post-inflationary composite axion model

Journal of High Energy Physics
Composite axions offer a scenario where the axion emerges as a pion-like state, avoiding fine-tuning of elementary scalars and ameliorating the axion quality problem. Despite these advantages, their post-inflationary cosmology remains largely unexplored,
Aleksandr Azatov, Mohamed Mahdi Khalil, Motoo Suzuki   +2 more
doaj   +1 more source

Cosmic millicharge background and reheating probes

Journal of High Energy Physics
We demonstrate that the searches for dark sector particles can provide probes of reheating scenarios, focusing on the cosmic millicharge background produced in the early universe.
Xucheng Gan, Yu-Dai Tsai
doaj   +1 more source

Absence of one-loop effects on large scales from small scales in non-slow-roll dynamics

Journal of High Energy Physics
We question the existence of one-loop corrections to the large-scale power spectrum from small-scale modes in non-slow-roll dynamics which are not volume suppressed by the ratio of the short to long distance scales. One-loop contributions proportional to
Jacopo Fumagalli
doaj   +1 more source

Building Beyond the Standard Model: Tools from Cosmology to Particle Theory

The current landscape of high-energy theory and cosmology suffers from an abundance of theoretical models coupled with a lack of immediate new data to constrain them. This thesis addresses several open questions in early-universe cosmology and beyond-the-
Bagherian, Hengameh
core  

Chaotic inflation RIDES again

Journal of High Energy Physics
Following the recent Atacama Cosmology Telescope (ACT) results, we revisit chaotic inflation based on a single complex scalar field with mass term M 2|Φ|2, which usually predicts a spectral index n s ≈ 0.96 but a too-large tensor to scalar ratio r ≈ 0.16.
Venus Keus, Stephen F. King
doaj   +1 more source

Cosmological stasis from field-dependent decay

Journal of High Energy Physics
Cosmological stasis is a new type of epoch in the cosmological timeline during which the cosmological abundances of different energy components — such as vacuum energy, matter, and radiation — remain constant despite the expansion of the universe ...
Fei Huang, V. Knapp-Pérez
doaj   +1 more source

Adaptive asymptotic solutions of inflationary models in the Hamilton-Jacobi formalism: application to T-models

Journal of High Energy Physics
We develop a method to compute the slow-roll expansion for the Hubble parameter in inflationary models in a flat Friedmann-Lemaître-Robertson-Walker spacetime that is applicable to a wide class of potentials including monomial, polynomial, or rational ...
Elena Medina, Gabriel Álvarez
doaj   +1 more source

Pre-thermalized gravitational waves

Journal of High Energy Physics
We investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating, where the energy density is dominated by non-thermalized inflaton decay products, dubbed reheatons. We consider
Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu, Yong Xu   +3 more
doaj   +1 more source

Thermal gravitational waves during reheating

Journal of High Energy Physics
In this work, we revisit the generation of stochastic gravitational waves (GWs) from interactions in the thermal plasma. We extend the existing literature by incorporating the reheating phase into the thermal history.
Nicolás Bernal, Yong Xu
doaj   +1 more source