For example, with independent scanning of f and, TeV-scale LSP DM and an axion solution to the strong CP problem are unlikely to coexist. In theories with independent scanning of multiple DM components, there is a high probability for DM to be dominated by a single component. low values of the PQ scale f for the QCD axion and low values of the superpartner mass scale for LSP thermal relics. This requires a probability distribution favoring low amounts of DM, i.e. The observed values of the cosmological constant and the abundance of Dark Matter (DM) can be successfully understood, using certain measures, by imposing the anthropic requirement that density perturbations go non-linear and virialize to form halos.
Our research is mainly on LSP and Neutrino models.ĭ'Eramo, Francesco Hall, Lawrence J. This function adequately treats both void size and redshift, and describes the scale radius and the central density of voids. We formulate a novel empirical function for the average density profile of cosmic voids, identified via the watershed technique in ΛCDM N-body simulations. Dark matter made from neutrinos is termed ``hot dark matter''. One advantage of the Neutrino Model is that they are known to exist. According to some researchers, these may be the explanation for the dark matter. Similar to the cosmic microwave background radiation left over from the Big Bang, there is a background of low-energy neutrinos in our Universe. The Lightest Supersymmetric Particle( LSP) of supersymmetric models is a dark matter candidate, and is classified as a Weakly Interacting Massive Particle (WIMP). Generally, the proposed candidates can be put in three categories: baryonic dark matter, hot dark matter, and cold dark matter.
Department of Energy's Lawrence Berkeley National Laboratory's (Berkeley Lab) National Energy Research Scientific Computing Center (NERSC) and Brown University's Center for Computation and Visualization (CCV), can potentially eliminate some particle models of dark matter. The Large Underground Xenon (LUX) improvements, aided by advanced computer simulations at the U.S. Since the generally-accepted view among astrophysicists is that the matter component of the universe is mostly dark matter, the search for dark matter particles continues unabated. McKeough, James Hira, Ajit Valdez, Alexandra Theoretical Comparison Between Candidates for Dark Matter On the other hand, the reheating temperature is linked to the PQ scale and should be higher than 104-105 GeV in the gravitino dark matter scenario.« less In the axion dark matter scenario, the initial misalignment angle is restricted to be Script O(1). We discuss the implications for the nature of dark matter in light of the axino baryogenesis mechanism, and find that both the axion and a metastable gravitinomore » can provide the correct dark matter density. This scenario predicts large R-parity violation for the stop, and an upper limit on the squark masses between 15 and 130 TeV, for different choices of the Peccei-Quinn scale and the soft Xt terms. As a specific example, we use a supersymmetric axion model with an axino LSP. We discuss a new mechanism for baryogenesis, in which the baryon asymmetry is generated by the lightest supersymmetric particle ( LSP) decay via baryonic R-parity-violating interactions.
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