Abstract
The primordial inflation dilutes all matter except the quantum fluctuations which we see in the cosmic microwave background radiation. Therefore the last phases of inflation must be embedded within a beyond the Standard Model sector where the inflaton can directly excite the Standard Model quarks and leptons. In this paper we consider two inflaton candidates and whose decay can naturally excite all the relevant degrees of freedom besides thermalizing the lightest supersymmetric particle (LSP) during and after reheating. In particular, we present the regions of the parameter space which can yield successful inflation with the right temperature anisotropy in the cosmic microwave background, the observed relic density for the neutralino LSP, and the recent Higgs mass constraints from LHC within the minimal supersymmetric Standard Model with nonuniversal Higgs masses—referred to as the NUHM2 model. We found that in most scenarios the LSP seems strongly mass degenerated with the next to lightest LSP and the branching ratio very close to the present bound, thus leading to falsifiable predictions. Also the dark matter interactions with XENON nuclei would fall within the projected range for the XENON1T experiment. In the case of a positive signal of low-scale supersymmetry at the LHC, one would be able to potentially pin down the inflaton mass by using the associated values for the mass of the stau, the stop, and the neutralino.
9 More- Received 16 November 2012
DOI:https://doi.org/10.1103/PhysRevD.87.023529
© 2013 American Physical Society