| 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, p. 17-pg., 2017-06-20. |
| 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 Opportunities: | Research Projects - Thematic Grants |