The primordial matter power spectrum on sub-galactic scales

Author:

Gilman Daniel1ORCID,Benson Andrew2ORCID,Bovy Jo1ORCID,Birrer Simon34,Treu Tommaso5ORCID,Nierenberg Anna6

Affiliation:

1. Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada

2. Carnegie Observatories , 813 Santa Barbara Street, Pasadena, CA 91101, USA

3. Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University , Stanford, CA 94305, USA

4. SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA

5. Department of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA

6. Department of Physics, University of California Merced , 5200 North Lake Road Merced, CA 95343, USA

Abstract

ABSTRACT The primordial matter power spectrum quantifies fluctuations in the distribution of dark matter immediately following inflation. Over cosmic time, overdense regions of the primordial density field grow and collapse into dark matter haloes, whose abundance and density profiles retain memory of the initial conditions. By analysing the image magnifications in 11 strongly lensed and quadruply imaged quasars, we infer the abundance and concentrations of low-mass haloes, and cast the measurement in terms of the amplitude of the primordial matter power spectrum. We anchor the power spectrum on large scales, isolating the effect of small-scale deviations from the Lambda cold dark matter (ΛCDM) prediction. Assuming an analytic model for the power spectrum and accounting for several sources of potential systematic uncertainty, including three different models for the halo mass function, we obtain correlated inferences of $\log _{10}\left(P / P_{\Lambda \rm {CDM}}\right)$, the power spectrum amplitude relative to the predictions of the concordance cosmological model, of $0.0_{-0.4}^{+0.5}$, $0.1_{-0.6}^{+0.7}$, and $0.2_{-0.9}^{+1.0}$ at k = 10, 25, and 50 $\rm {Mpc^{-1}}$ at $68 {{\ \rm per\ cent}}$ confidence, consistent with CDM and single-field slow-roll inflation.

Funder

NSERC

NASA

NSF

Packard Foundation

Moore Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 12 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. An analytic surface density profile for ΛCDM haloes and gravitational lensing studies;Monthly Notices of the Royal Astronomical Society;2024-01-05

2. Nonthermal warm dark matter limits from small-scale structure;Physical Review D;2023-08-15

3. Primordial power spectrum in light of JWST observations of high redshift galaxies;Monthly Notices of the Royal Astronomical Society: Letters;2023-08-03

4. Strong lensing constraints on primordial black holes as a dark matter candidate;Monthly Notices of the Royal Astronomical Society;2023-05-04

5. Constraining resonant dark matter self-interactions with strong gravitational lenses;Physical Review D;2023-05-04

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