Can I read Constraining the Primordial Curvature Perturbation Using Dark Matter Substructure on EtoBox?

Constraining the Primordial Curvature Perturbation Using Dark Matter Substructure by Ando, Shin'ichiro; Hiroshima, Nagisa; Ishiwata, Koji is a scholarly article available to read on EtoBox.

What is Constraining the Primordial Curvature Perturbation Using Dark Matter Substructure about?

We investigate the primordial curvature perturbation by the observation of dark matter substructure. Assuming a bump in the spectrum of the curvature perturbation in the wavenumber of k>1 Mpc^{-1}, we track the evolution of the host halo and subhalos in a semi-analytic way. Taking into account possible uncertainties in the evaluation of the tidal stripping effect on the subhalo growth, we find a new robust bound on the curvature perturbation with a bump from the number of observed dwarf spheroidal galaxies in our Galaxy and the observations of the stellar stream. The upper limit on the amplitude of the bump is O(10^{-7}) for k~10^3 Mpc^{-1}. Furthermore we find the boost factor, which is crucial for the indirect detection of dark matter signals, is up to O(10^4) due to the bump that is allowed in the current observational bounds.

Author

Ando, Shin'ichiro; Hiroshima, Nagisa; Ishiwata, Koji

Published

2022

Language

EN