Results 1 to 10 of about 4,842 (140)

A Portalino to the Twin Sector

Journal of High Energy Physics, 2023
Extensions of the Standard Model are often highly constrained by cosmology. New states in the theory can dramatically alter observed properties of the universe by the presence of additional matter or entropy.
Di Liu, Neal Weiner
doaj   +1 more source

Dark photon dark matter from cosmic strings and gravitational wave background

Journal of High Energy Physics, 2023
Dark photon dark matter may be produced by the cosmic strings in association with the dark U(1) gauge symmetry breaking. We perform three-dimensional lattice simulations of the Abelian-Higgs model and follow the evolution of cosmic strings. In particular,
Naoya Kitajima, Kazunori Nakayama
doaj   +1 more source

Axion dark matter with thermal friction

Journal of High Energy Physics, 2023
Cosmological evolution of axion field in the early universe might be significantly affected by a thermal friction induced by the axion coupling to thermalized hidden sector.
Kiwoon Choi, Sang Hui Im, Hee Jung Kim, Hyeonseok Seong   +3 more
doaj   +1 more source

Multifield positivity bounds for inflation

Journal of High Energy Physics, 2023
Positivity bounds represent nontrivial limitations on effective field theories (EFTs) if those EFTs are to be completed into a Lorentz-invariant, causal, local, and unitary framework.
Marat Freytsis, Soubhik Kumar, Grant N. Remmen, Nicholas L. Rodd   +3 more
doaj   +1 more source

The hand-made tail: non-perturbative tails from multifield inflation

Journal of High Energy Physics, 2022
It is becoming increasingly clear that large but rare fluctuations of the primordial curvature field, controlled by the tail of its probability distribution, could have dramatic effects on the current structure of the universe — e.g. via primordial black-
Ana Achúcarro, Sebastián Céspedes, Anne-Christine Davis, Gonzalo A. Palma   +3 more
doaj   +1 more source

A novel solution to the gravitino problem

Journal of High Energy Physics, 2023
In a general phenomenological model with local supersymmetry, the amount of massive gravitinos produced in early universe tends to violate the known dark matter density bound by many orders of magnitude.
Yu-Cheng Qiu, S.-H. Henry Tye
doaj   +1 more source

Cosmological constraints on dark scalar

Journal of High Energy Physics, 2022
We discuss cosmological constraints on a dark scalar particle mixing with the Standard Model Higgs boson. We pay particular attention to the dark scalar production process when the reheating temperature of the Universe is very low, which allows us to ...
Masahiro Ibe, Shin Kobayashi, Yuhei Nakayama, Satoshi Shirai   +3 more
doaj   +1 more source

LHC / ILC / Cosmology Interplay [PDF]

, 2006
There is a strong and growing interplay between particle physics and cosmology. In this talk, I discuss some aspects of this interplay concerning dark matter candidates put forth by theories beyond the Standard Model.
A J Barr, A Pilaftsis, A Pilaftsis, B C Allanach, C L Bennett, D A Demir, D N Spergel, E W Kolb, G Belanger, G Bertone, G Jungman, H Goldberg, J R Ellis, K Desch, K Enqvist, M Dine, M Drees, M Tegmark, R Barate, Sabine Kraml, V Khotilovich   +20 more
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Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed

Journal of High Energy Physics, 2022
We investigate both the null energy condition (NEC) violating scenario and the c T -diminishing scenario for generating enhanced power spectrum of primordial gravitational waves (GWs) during inflation, where c T is the propagating speed of primordial GWs.
Yong Cai, Yun-Song Piao
doaj   +1 more source

New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders [PDF]

, 2017
Future electron-proton collider proposals like the LHeC or the FCC-eh can supply 1/ab of collisions with a center-of-mass energy in the TeV range, while maintaining a clean experimental environment more commonly associated with lepton colliders. We point
Curtin, David, Deshpande, Kaustubh, Fischer, Oliver, Zurita, Jose   +3 more
core   +3 more sources