Results 31 to 40 of about 2,716,965 (190)

First principles cosmology of the Standard Model epoch [PDF]

arXiv, 2022
This is a short summary of a project to construct a first principles cosmology of the Standard Model epoch, the period starting shortly before the electro-weak transition. The cosmology is derived from a simple initial state entirely within the SM and General Relativity.
arxiv  

Explanation for why the Early Universe was Stable and Dominated by the Standard Model [PDF]

JCAP 12 (2020) 025, 2019
The Standard Model (SM) possesses an instability at high scales that would be catastrophic during or just after inflation, and yet no new physics has been seen to alter this. Furthermore, modern developments in quantum gravity suggest that the SM degrees of freedom are not unique; that a typical low energy effective theory should include a large ...
arxiv   +1 more source

Standard Model in conformal geometry: local vs gauged scale invariance [PDF]

arXiv, 2023
We discuss comparatively local versus gauged Weyl symmetry beyond Standard Model (SM) and Einstein gravity and their geometric interpretation. The SM and Einstein gravity admit a natural embedding in Weyl integrable geometry which is a special limit of Weyl conformal (non-metric) geometry.
arxiv  

Particle Physics and Cosmology

, 2014
Today, both particle physics and cosmology are described by few parameter Standard Models, i.e. it is possible to deduce consequence of particle physics in cosmology and vice verse.
Pralavorio, P.
core   +1 more source

Non-minimal (self-)running inflation: metric vs. Palatini formulation

Journal of High Energy Physics, 2021
We consider a model of quartic inflation where the inflaton is coupled non-minimally to gravity and the self-induced radiative corrections to its effective potential are dominant.
Antonio Racioppi
doaj   +1 more source

Leading loop effects in pseudoscalar-Higgs portal dark matter

Journal of High Energy Physics, 2019
We examine a model with a fermionic dark matter candidate having pseudoscalar interaction with the standard model particles where its direct detection elastic scattering cross section at tree level is highly suppressed. We then calculate analytically the
Karim Ghorbani, Parsa Hossein Ghorbani
doaj   +1 more source

Some Aspects of String Cosmology and the LHC

, 2012
I discuss some (unconventional) aspects of String Cosmology of relevance to supersymmetric dark matter searches at the Large Hadron Collider (LHC) at CERN.
Mavromatos, Nick E.
core   +1 more source

Axion-like particles as mediators for dark matter: beyond freeze-out [PDF]

, 2022
We consider an axion-like particle (ALP) coupled to Standard Model (SM) fermions as a mediator between the SM and a fermionic dark matter (DM) particle. We explore the case where the ALP-SM and/or the ALP-DM couplings are too small to allow for DM generation via standard freeze-out.
arxiv   +1 more source

Gravity and axions from a random UV QFT

, 2014
It is postulated that the UV QFT is enormous and random. The coupling of the Standard Model to such QFT is analyzed. It is argued that massless 4d gravity and axions are general avatars of the postulate.
Kiritsis, Elias
core   +2 more sources

Is the Higgs Boson the Master of the Universe? [PDF]

arXiv, 2023
The discovery of the Higgs particle has yielded a specific value for the mass of the Higgs boson, which, depending on some technical details in the calculation of the $\overline{\mathrm{MS}}$ parameters (relevant for the high energy range) from the physical parameters (measured in low energy range), allows the Standard Model (SM) to hold up to the ...
arxiv