Perturbative reheating in Sneutrino-Higgs cosmology

Abstract

The theory of perturbative reheating in the Sneutrino-Higgs cosmology of the B-L MSSM is presented. It is shown that following an epoch of inflation consistent with all Planck2015 data, the inflaton begins to oscillate around its minimum at zero and to reheat to various species of standard model and supersymmetric matter. The perturbative decay rates to this matter are computed, both analytically and numerically. Using these results, the Hubble parameter and the relative energy densities for each matter species, including that of the inflaton, are calculated numerically. The inflaton energy density is demonstrated to vanish at an energy scale of O(10 13 ) GeV, signaling the end of the period of reheating. The newly created matter background is shown to be in thermal equilibrium, with a reheating temperature of 1.13×10 13 GeV. To allow for a B-L breaking scale sufficiently smaller than the reheating scale, we extend the statistical method of determining the soft supersymmetry breaking parameters developed in previous work. The result is that one can determine a large number of phenomenologically realistic initial conditions for which the B-L breaking scale is an order of magnitude or more smaller than the reheating scale. 1

R-parity violating decays of Wino chargino and wino neutralino LSPs and NLSPs at the LHC

“…Finally, gauging the N = 1 supersymmetry couples the B − L MSSM directly to N = 1 supergravitation. This allows both theories of inflation [36][37][38][39] and "bouncing universe" cosmologies [40,41] to naturally arise within this context. We note in passing that for the B − L MSSM inflation theory to be consistent with the present cosmological data, its soft supersymmetry breaking scale must be raised to the order of 10 13 GeV.…”

Heterotic $M$-Theory Hidden Sectors with an Anomalous $U(1)$ Gauge Symmetry

“…The formalism presented in this paper will be used, in conjunction with heterotic M -theory cosmological theories, such as [52][53][54], to explore potentially new types of dark matter-composed of hidden sector moduli [55,56] and matter fields, both scalars and fermions. This work will be presented elsewhere.…”

Non-vanishing heterotic superpotentials on elliptic fibrations

“…Examples of such vacua include [3][4][5], [6,7] and [8][9][10][11][12][13]. Furthermore, these theories can lead to new inflationary scenarios for the early universe, as well as concrete mechanisms for alternative approaches to cosmology, such as "bouncing" cosmologies via heterotic five-branes, see [14][15][16][17] for recent results. Hence, it is imperative to move beyond the four-dimensional low energy limits of these theories and to address, and solve, the fundamental questions that arise from their compactification from higher-dimensions.…”