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Probing Small-Scale Power Spectra with Pulsar Timing Arrays

Lee, Vincent S. H. and Mitridate, Andrea and Trickle, Tanner and Zurek, Kathryn M. (2020) Probing Small-Scale Power Spectra with Pulsar Timing Arrays. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210223-142239026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 (as well as every other probe proposed to detect DM small scale structure). 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.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2012.09857arXivDiscussion Paper
ORCID:
AuthorORCID
Mitridate, Andrea0000-0003-2898-5844
Trickle, Tanner0000-0003-1371-4988
Zurek, Kathryn M.0000-0002-2629-337X
Additional Information:Attribution 4.0 International (CC BY 4.0). We thank Phil Hopkins, Stephen Taylor, and Huangyu Xiao for helpful discussions. This work is supported by the Quantum Information Science Enabled Discovery (QuantISED) for High Energy Physics (KA2401032).
Group:Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Quantum Information Science Enabled Discovery for High Energy PhysicsKA2401032
Record Number:CaltechAUTHORS:20210223-142239026
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210223-142239026
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:24 Feb 2021 00:18

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