The dark matter direct detection rates are highly correlated with the phase space distribution of dark matter particles in our galactic neighbourhood. In this paper we make a systematic study of the impact of astrophysical uncertainties on electron recoil events at the direct detection experiments with Xenon and semiconductor detectors. We find that within the standard halo model there can be up to $$ \sim 50\%$$ ∼ 50 % deviation from the fiducial choice in the exclusion bounds from these observational uncertainties. For non-standard halo models we report a similar deviation from the fiducial standard halo model when fitted with recent cosmological N-body simulations while even larger deviations are obtained in case of the observational uncertainties.

Self interaction of particulate dark matter may help thermalising the galactic center and driving core formation. The core radius is expectantly sensitive to the self interaction strength of dark matter. In this paper we study the feasibility of constraining dark matter self interaction from the distribution of the core radius in isolated haloes. We perform systematic N -body simulations of isolated galactic haloes in the mass range of 10 10 -10 15 M incorporating the impact of DM self interactions. Comparing the simulated profiles with observational data provides conservative upper limit on the self coupling cross-section σ/m DM < 9.8 cm 2 /gm at 95% confidence level. We report significant dependence of the derived bounds on the galactic density distribution models assumed in the analysis.

No abstract

No abstract

Self-interactions between dark matter particles can induce core formation in galaxies and lead to thermalization of their central regions. The strength of self-interactions between dark matter particles is correlated to the size of the thermalized regions. The possibility of placing a conservative limit on the self-interaction cross-section by analyzing the distribution of core radius in isolated galactic haloes is explored in this work. We systematically use dark matter only 𝑁-body simulations of spherically symmetric isolated haloes incorporating isotropic self-scattering. We report a conservative upper limit on the self-interaction cross-section, 𝜎/𝑚 < 9.8 cm 2 /gm at 95% confidence level by comparing the generated distributions with the observed data.