A Caltech Library Service

Probing small-scale power spectra with pulsar timing arrays

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.

[img] PDF - Published Version
Creative Commons Attribution.

[img] PDF - Submitted Version
Creative Commons Attribution.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Mitridate, Andrea0000-0003-2898-5844
Trickle, Tanner0000-0003-1371-4988
Zurek, Kathryn M.0000-0002-2629-337X
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
Funding AgencyGrant Number
Quantum Information Science Enabled Discovery for High Energy PhysicsKA2401032
Subject Keywords:Cosmology of Theories beyond the SM, Beyond Standard Model
Issue or Number:6
Record Number:CaltechAUTHORS:20210223-142239026
Persistent URL:
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).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108157
Deposited By: Tony Diaz
Deposited On:24 Feb 2021 00:18
Last Modified:07 Jun 2021 21:18

Repository Staff Only: item control page