Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Simply split strongly interacting massive particles

Full text
Author(s):
Bernal, Nicolas ; Chu, Xiaoyong ; Pradler, Josef
Total Authors: 3
Document type: Journal article
Source: Physical Review D; v. 95, n. 11 JUN 20 2017.
Web of Science Citations: 19
Abstract

Dark matter which interacts strongly with itself, but only feebly with the Standard Model, is a possibility that has been entertained to solve apparent small-scale structure problems that are pertinent to the noninteracting cold dark matter paradigm. In this paper, we study the simple case in which the self-scattering rate today is regulated by kinematics and/or the abundance ratio, through the mass splitting of nearly degenerate pseudo-Dirac fermions chi(1) and chi(2) or real scalars phi(1) and phi(2). We calculate the relic density of these states in a scenario where self-scattering proceeds through off-diagonal couplings with a vector particle V (dark photon) and where the abundance is set through number-depleting 4-to-2 reactions in the hidden sector, or, alternatively, via freeze-in. We study the implications of the considered models and their prospect of solving astrophysical small-scale structure problems. We also show how the introduction of the (meta) stable heavier state may be probed in future dark matter searches. (AU)

FAPESP's process: 11/11973-4 - ICTP South American Institute for Fundamental Research: a regional center for theoretical physics
Grantee:Nathan Jacob Berkovits
Support type: Research Projects - Thematic Grants