Long-lived Light Mediator to Dark Matter and Primordial Small Scale Spectrum
- Creators
- Zhang, Yue
Abstract
We calculate the early universe evolution of perturbations in the dark matter energy density in the context of simple dark sector models containing a GeV scale light mediator. We consider the case that the mediator is long lived, with lifetime up to a second, and before decaying it temporarily dominates the energy density of the universe. We show that for primordial perturbations that enter the horizon around this period, the interplay between linear growth during matter domination and collisional damping can generically lead to a sharp peak in the spectrum of dark matter density perturbation. As a result, the population of the smallest DM halos gets enhanced. Possible implications of this scenario are discussed.
Additional Information
© 2015 IOP Publishing. Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received March 11, 2015. Accepted April 15, 2015. Published May 6, 2015. We thank Sean Carroll, Clifford Cheung, Francis Yan Cyr-Racine, Hooman Davoudiasl, Jonathan Feng, Michael Graesser, Hong-Jian He, Goran Senjanovic, Tim Tait, Mark Wise, Hai-bo Yu for useful discussions and comments on the draft. This work is supported by the Gordon and Betty Moore Foundation through Grant #776 to the Caltech Moore Center for Theoretical Cosmology and Physics, and by the DOE Grant DE-FG02-92ER40701, and also by a DOE Early Career Award under Grant No. DE-SC0010255.Attached Files
Published - 1475-7516_2015_05_008.pdf
Submitted - zhang.pdf
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Additional details
- Eprint ID
- 56003
- Resolver ID
- CaltechAUTHORS:20150324-084840570
- Gordon and Betty Moore Foundation
- 776
- Department of Energy (DOE)
- DE-FG02-92ER40701
- Department of Energy (DOE)
- DE-SC0010255
- SCOAP3
- Created
-
2015-03-24Created from EPrint's datestamp field
- Updated
-
2022-07-12Created from EPrint's last_modified field
- Caltech groups
- Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
- Other Numbering System Name
- CALT-TH
- Other Numbering System Identifier
- 2015-008