SciPost Submission Page
Exponential Enhancement of Dark Matter Freezeout Abundance
by Bibhushan Shakya
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Bibhushan Shakya |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202212_00057v1 (pdf) |
| Date accepted: | 2023-04-24 |
| Date submitted: | 2022-12-20 16:35 |
| Submitted by: | Shakya, Bibhushan |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 14th International Conference on Identification of Dark Matter (IDM2022) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Phenomenological |
Abstract
A novel paradigm for thermal dark matter (DM), termed "bouncing dark matter", is presented. In canonical thermal DM scenarios, the DM abundance falls exponentially as the temperature drops below the mass of DM, until thermal freezeout occurs. This note explores a broader class of thermal DM models that are exceptions to this rule, where the DM abundance can deviate from the exponentially falling curve, and even rise exponentially, while in thermal equilibrium. Such scenarios can feature present day DM annihilation cross sections much larger than the canonical thermal target, improving the prospects for indirect detection of DM annihilation signals.
Author comments upon resubmission
List of changes
Added the following sentence at the end of the paragraph after Figure 1 on page 3: "Other processes that can disrupt the bounce, such as $\chi\phi_2\to\phi_1\phi_2$, tend to freeze out earlier than $\phi_2\phi_2\to \chi\phi_1$ due to the smaller number densities of $\chi$ before the bounce, but may recouple after the bounce and affect the final relic density. "
Published as SciPost Phys. Proc. 12, 070 (2023)