Results 21 to 30 of about 1,134 (172)

Search for Physics beyond the Standard Model in four- and three-top quark production [PDF]

open access: yesJournal of Subatomic Particles and Cosmology
A reinterpretation of four-top quark ($t\bar{t}t\bar{t}$) production is presented using the full Run 2 dataset recorded by the CMS experiment, corresponding to an integrated luminosity of 138 fb$^{-1}$.
M. Shooshtari   +1 more
semanticscholar   +1 more source

Limits from BBN on light electromagnetic decays

open access: yesJournal of High Energy Physics, 2019
Injection of electromagnetic energy — photons, electrons, or positrons — into the plasma of the early universe can destroy light elements created by primordial Big Bang Nucleosynthesis (BBN).
Lindsay Forestell   +2 more
doaj   +1 more source

Hidden dark matter from Starobinsky inflation

open access: yesJournal of High Energy Physics, 2021
The Starobinsky inflation model is one of the simplest inflation models that is consistent with the cosmic microwave background observations. In order to explain dark matter of the universe, we consider a minimal extension of the Starobinsky inflation ...
Qiang Li   +3 more
doaj   +1 more source

DAMPE electron-positron excess in leptophilic Z′ model

open access: yesJournal of High Energy Physics, 2018
Recently the DArk Matter Particle Explorer (DAMPE) has reported an excess in the electron-positron flux of the cosmic rays which is interpreted as a dark matter particle with the mass about 1.5 TeV.
Karim Ghorbani, Parsa Hossein Ghorbani
doaj   +1 more source

Euclid preparation. Simulations and non-linearities beyond Lambda cold dark matter. I. Numerical methods and validation [PDF]

open access: yesAstronomy & Astrophysics
To constrain cosmological models beyond Lambda CDM, the development of the analysis pipeline requires simulations that capture the non-linear phenomenology of such models.
Euclid Collaboration J. Adamek   +499 more
semanticscholar   +1 more source

Improved bounds on ℤ3 singlet dark matter

open access: yesJournal of High Energy Physics, 2019
We reconsider complex scalar singlet dark matter stabilised by a ℤ3 symmetry. We refine the stability bounds on the potential and use constraints from unitarity on scattering at finite energy to place a stronger lower limit on the direct detection cross ...
A. Hektor, A. Hryczuk, K. Kannike
doaj   +1 more source

Particle production from oscillating scalar field and consistency of Boltzmann equation

open access: yesJournal of High Energy Physics, 2021
Boltzmann equation plays important roles in particle cosmology in studying the evolution of distribution functions (also called as occupation numbers) of various particles.
Takeo Moroi, Wen Yin
doaj   +1 more source

Forbidden frozen-in dark matter

open access: yesJournal of High Energy Physics, 2019
We examine and point out the importance of a regime of dark matter pro- duction through the freeze-in mechanism that results from a large thermal correction to a decaying mediator particle mass from hot plasma in the early Universe. We show that mediator
L. Darmé   +3 more
doaj   +1 more source

Gravitational waves from supercool axions

open access: yesJournal of High Energy Physics, 2020
We study the dynamics of the Peccei-Quinn (PQ) phase transition for the QCD axion. In weakly coupled models the transition is typically second order except in the region of parameters where the PQ symmetry is broken through the Coleman-Weinberg mechanism.
Luigi Delle Rose   +3 more
doaj   +1 more source

Euclid preparation. LXIII. Simulations and non-linearities beyond Lambda cold dark matter. 2. Results from non-standard simulations [PDF]

open access: yesAstronomy & Astrophysics
The mission will measure cosmological parameters with unprecedented precision. To distinguish between cosmological models, it is essential to generate realistic mock observables from cosmological simulations that were run in both the standard Λ-cold-dark-
Euclid Collaboration G. R'acz   +499 more
semanticscholar   +1 more source

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