Abstract
I discuss some (unconventional) aspects of String Cosmology of relevance to supersymmetric dark matter searches at the Large Hadron Collider (LHC) at CERN. In particular, I analyse the role of time-dependent dilaton fields in relaxing some of the stringent constraints that characterise minimal supersymmetric models in standard cos- mology. I also study briefly CPT-violating aspects of brane Universe models with space- time brane defects at early epochs and their potential relevance to the observed Baryon Asymmetry.
Highlights
Motivation and SummaryWe are already into the second decade of the 21st century, and for the past twelve years we have been witnessing extraordinary developments and discoveries, both at the technological and conceptual levels, in the fields of astro-particle physics and cosmology
One needs extra sources of CP violation, which can provide the necessary asymmetry in particle vs antiparticle decays in the early Universe, leading to the observed matter-antimatter asymmetry today, that is explaining why the Universe is mostly made of matter
This is a nice feature of our string model, which is not met in other CPT Violation (CPTV) cases, induced by the coupling of the fermion spin to local curvature in background space-times, that could characterise the early Universe [28], where the positive sign of Δn has to be fixed by hand
Summary
The recent LHC discovery of a Higgs-like state with mass around 126 GeV [1] can still accommodate such extensions [6] It is the cosmology, that imposes severe restrictions in the available parameter space of the constrained minimal supersymmetric standard model (otherwise known as minimal SuperGravity (mSUGRA)) [7] 1. The structure of the talk is as follows: 2 we concentrate on such a feature of string-inspired cosmological models, involving time-dependent cosmic dilaton fields, and argue how the thermal relic abundance of dark matter candidates of mSUGRA-like models, when embedded in this framework, is diluted, compared to standard cosmology with no (or constant) dilatons, to a point where the current LHC/WMAP constraints can be avoided. That the contents of this article reflect personal research interests of the speaker and they by no means constitute a comprehensive review of the subject of string cosmology
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