Hoernisa Iminniyaz

Relic abundance of asymmetric Dark Matter

We investigate the relic abundance of asymmetric Dark Matter particles that were in thermal equilibrium in the early universe. The standard analytic calculation of the symmetric Dark Matter is generalized to the asymmetric case. We calculate the asymmetry required to explain the observed Dark Matter relic abundance as a function of the annihilation cross section. We show that introducing an asymmetry always reduces the indirect detection signal from WIMP annihilation, although it has a larger annihilation cross section than symmetric Dark Matter. This opens new possibilities for the construction of realistic models of MeV Dark Matter.

Proton Stability, Dark Matter and Light Color Octet Scalars in Adjoint SU(5) Unification

The unification of gauge interactions in the context of adjoint

Abundance of cosmological relics in low-temperature scenarios

SU(5)

Relic abundance of asymmetric Dark Matter in quintessence

and its phenomenological consequences are investigated. We show the allowed mass spectrum of the theory which is compatible with proton decay and discuss the possibility of having a cold dark matter candidate. Because of the upper bounds on the proton decay partial lifetimes,

Gauge mediated supersymmetry breaking via seesaw mechanisms

\ensuremath{\tau}(p\ensuremath{\rightarrow}{K}^{+}\overline{\ensuremath{\nu}})\ensuremath{\le}9.3\ifmmode\times\else\texttimes\fi{}{10}^{36}\text{ }\text{ }\mathrm{years}

Asymmetric dark matter and the scalar-tensor model

and

Abundance of Asymmetric Dark Matter in Brane World Cosmology

\ensuremath{\tau}(p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\overline{\ensuremath{\nu}})\ensuremath{\le}3.0\ifmmode\times\else\texttimes\fi{}{10}^{35}\text{ }\text{ }\mathrm{years}

Thermal abundance of non-relativistic relics with Sommerfeld enhancement

, the theory could be tested at future proton decay experiments. The theory predicts also light scalar color octets which could be produced at the Large Hadron Collider.

Asymmetric Dark Matter in the Shear--dominated Universe

We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in cosmological scenarios in which the temperature T is too low for \chi to achieve full chemical equilibrium. The case with a heavier particle decaying into \chi is also investigated. We derive approximate solutions for n_\chi(T) which accurately reproduce numerical results when full thermal equilibrium is not achieved. If full equilibrium is reached, our ansatz no longer reproduces the correct temperature dependence of the \chi number density. However, it does give the correct final relic density, to an accuracy of about 3% or better, for all cross sections and initial temperatures.

Exploring the dark matter inelastic frontier with 79.6 days of PandaX-II data

Abstract We investigate the relic abundance of asymmetric Dark Matter particles in quintessence model with a kination phase. The analytic calculation of the asymmetric Dark Matter in the standard cosmological scenario is extended to the nonstandard cosmological scenario where we specifically discuss the quintessence model with a kination phase. We found that the enhancement of Hubble rate changes the relic density of particles and anti-particles. We use the present day Dark Matter abundance to constrain the Hubble rate in quintessence model with a kination phase for asymmetric Dark Matter.