Lee, Vincent S. H. and Mitridate, Andrea and Trickle, Tanner and Zurek, Kathryn M. (2021) Probing small-scale power spectra with pulsar timing arrays. Journal of High Energy Physics, 2021 (6). Art. No. 28. ISSN 1126-6708. doi:10.1007/JHEP06(2021)028. https://resolver.caltech.edu/CaltechAUTHORS:20210223-142239026
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Abstract
Models of Dark Matter (DM) can leave unique imprints on the Universe’s small scale structure by boosting density perturbations on small scales. We study the capability of Pulsar Timing Arrays to search for, and constrain, subhalos from such models. The models of DM we consider are ordinary adiabatic perturbations in ΛCDM, QCD axion miniclusters, models with early matter domination, and vector DM produced during inflation. We show that ΛCDM, largely due to tidal stripping effects in the Milky Way, is out of reach for PTAs. Axion miniclusters may be within reach, although this depends crucially on whether the axion relic density is dominated by the misalignment or string contribution. Models where there is matter domination with a reheat temperature below 1 GeV may be observed with future PTAs. Lastly, vector DM produced during inflation can be detected if it is lighter than 10⁻¹⁶ GeV. We also make publicly available a Python Monte Carlo tool for generating the PTA time delay signal from any model of DM substructure.
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| Additional Information: | © 2021 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. Received: March 15, 2021; Revised: May 12, 2021; Accepted: May 22, 2021; Published: June 3, 2021. We thank Phil Hopkins, Stephen Taylor, Huangyu Xiao for useful discussion. This work is supported by the Quantum Information Science Enabled Discovery (QuantISED) for High Energy Physics (KA2401032). | |||||||||
| Group: | Walter Burke Institute for Theoretical Physics | |||||||||
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| Subject Keywords: | Cosmology of Theories beyond the SM, Beyond Standard Model | |||||||||
| Issue or Number: | 6 | |||||||||
| DOI: | 10.1007/JHEP06(2021)028 | |||||||||
| Record Number: | CaltechAUTHORS:20210223-142239026 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210223-142239026 | |||||||||
| Official Citation: | Lee, V.S.H., Mitridate, A., Trickle, T. et al. Probing small-scale power spectra with pulsar timing arrays. J. High Energ. Phys. 2021, 28 (2021). https://doi.org/10.1007/JHEP06(2021)028 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 108157 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 24 Feb 2021 00:18 | |||||||||
| Last Modified: | 07 Jun 2021 21:18 |
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