Results 71 to 80 of about 465 (109)

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

Graviton production from inflaton condensate: Boltzmann vs Bogoliubov

Journal of High Energy Physics
We study graviton production from an oscillating inflaton condensate during reheating by systematically comparing Boltzmann and Bogoliubov descriptions for inflaton potentials of the form V(ϕ) ∝ ϕ n around the minimum. The Bogoliubov framework provides a
Chenhuan Wang, Yong Xu, Wenbin Zhao
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

Specially embedding a composite axion model

Journal of High Energy Physics
We present a novel framework of the post-inflationary composite axion to address the strong CP problem without the cosmological domain wall problem. Conventional composite axion models lead to the domain wall number greater than one, producing stable ...
Shihwen Hor, Yuichiro Nakai, Motoo Suzuki, Junxuan Xu   +3 more
doaj   +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

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

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

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

Gravitational production of heavy particles during and after inflation

Journal of High Energy Physics
We investigate the gravitational production of a scalar field χ with a mass exceeding the Hubble scale during inflation m χ ≳ H I , employing both analytical and numerical approaches.
Davide Racco, Sarunas Verner, Wei Xue
doaj   +1 more source

Ultra-high frequency gravitational waves from scattering, Bremsstrahlung and decay during reheating

Journal of High Energy Physics
We investigate ultra-high frequency gravitational waves (GWs) from gravitons generated during inflationary reheating. Specifically, we study inflaton scattering with its decay product, where the couplings involved in this 2 → 2 scattering are the same as
Yong Xu
doaj   +1 more source