It is not σ8: constraining the non-linear matter power spectrum with the Dark Energy Survey Year-5 supernova sample

DES Collaboration; E. Gaztanaga

doi:10.1093/mnras/staf286

It is not σ₈: constraining the non-linear matter power spectrum with the Dark Energy Survey Year-5 supernova sample

DES Collaboration, E. Gaztanaga

Institute of Cosmology & Gravitation

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Abstract

The weak gravitational lensing magnification of Type Ia supernovae (SNe Ia) is sensitive to the matter power spectrum on scales k > 1h Mpc⁻¹, making it unwise to interpret SNe Ia lensing in terms of power on linear scales. We compute the probability density function of SNe Ia magnification as a function of standard cosmological parameters, plus an empirical parameter A_mod which describes the suppression or enhancement of matter power on non-linear scales compared to a cold dark matter only model. While baryons are expected to enhance power on the scales relevant to SN Ia lensing, other physics such as neutrino masses or non-standard dark matter may suppress power. Using the Dark Energy Survey Year-5 sample, we find A_mod = 0.77⁺₋₀⁰^.₄₀⁶⁹ (68 per cent credible interval around the median). Although the median is consistent with unity there are hints of power suppression, with A_mod < 1.09 at 68 per cent credibility.

Original language	English
Pages (from-to)	3814-3825
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	537
Issue number	4
Early online date	25 Feb 2025
DOIs	https://doi.org/10.1093/mnras/staf286
Publication status	Published - 1 Mar 2025

Keywords

cosmology: cosmological parameters
cosmology: dark matter
galaxies: haloes
gravitational lensing: weak
transients: supernovae
UKRI
STFC

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10.1093/mnras/staf286

constraining the non-linear matter power spectrum with the Dark Energy Survey Year-5 supernova sampleFinal published version, 1.24 MBLicence: CC BY

Cite this

@article{11c1c0efd4a0460cbcae40b7d99776da,

title = "It is not σ8: constraining the non-linear matter power spectrum with the Dark Energy Survey Year-5 supernova sample",

abstract = "The weak gravitational lensing magnification of Type Ia supernovae (SNe Ia) is sensitive to the matter power spectrum on scales k > 1h Mpc−1, making it unwise to interpret SNe Ia lensing in terms of power on linear scales. We compute the probability density function of SNe Ia magnification as a function of standard cosmological parameters, plus an empirical parameter Amod which describes the suppression or enhancement of matter power on non-linear scales compared to a cold dark matter only model. While baryons are expected to enhance power on the scales relevant to SN Ia lensing, other physics such as neutrino masses or non-standard dark matter may suppress power. Using the Dark Energy Survey Year-5 sample, we find Amod = 0.77+−00.4069 (68 per cent credible interval around the median). Although the median is consistent with unity there are hints of power suppression, with Amod < 1.09 at 68 per cent credibility.",

keywords = "cosmology: cosmological parameters, cosmology: dark matter, galaxies: haloes, gravitational lensing: weak, transients: supernovae, UKRI, STFC",

author = "\{DES Collaboration\} and P. Shah and Davis, \{T. M.\} and M. Vincenzi and P. Armstrong and D. Brout and R. Camilleri and L. Galbany and Gill, \{M. S.S.\} and D. Huterer and N. Jeffrey and O. Lahav and J. Lee and C. Lidman and A. M{\"o}ller and M. Sullivan and L. Whiteway and P. Wiseman and S. Allam and M. Aguena and J. Annis and J. Blazek and D. Brooks and Rosell, \{A. Carnero\} and J. Carretero and C. Conselice and \{da Costa\}, \{L. N.\} and Pereira, \{M. E.S.\} and S. Desai and Diehl, \{H. T.\} and P. Doel and S. Everett and I. Ferrero and B. Flaugher and J. Frieman and J. Garc{\'i}a-Bellido and E. Gaztanaga and G. Giannini and D. Gruen and Gruendl, \{R. A.\} and G. Gutierrez and Hinton, \{S. R.\} and Hollowood, \{D. L.\} and K. Honscheid and James, \{D. J.\} and S. Lee and Marshall, \{J. L.\} and J. Mena-Fern{\'a}ndez and R. Miquel and A. Palmese and A. Pieres",

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doi = "10.1093/mnras/staf286",

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TY - JOUR

T1 - It is not σ8

T2 - constraining the non-linear matter power spectrum with the Dark Energy Survey Year-5 supernova sample

AU - DES Collaboration

AU - Shah, P.

AU - Davis, T. M.

AU - Vincenzi, M.

AU - Armstrong, P.

AU - Brout, D.

AU - Camilleri, R.

AU - Galbany, L.

AU - Gill, M. S.S.

AU - Huterer, D.

AU - Jeffrey, N.

AU - Lahav, O.

AU - Lee, J.

AU - Lidman, C.

AU - Möller, A.

AU - Sullivan, M.

AU - Whiteway, L.

AU - Wiseman, P.

AU - Allam, S.

AU - Aguena, M.

AU - Annis, J.

AU - Blazek, J.

AU - Brooks, D.

AU - Rosell, A. Carnero

AU - Carretero, J.

AU - Conselice, C.

AU - da Costa, L. N.

AU - Pereira, M. E.S.

AU - Desai, S.

AU - Diehl, H. T.

AU - Doel, P.

AU - Everett, S.

AU - Ferrero, I.

AU - Flaugher, B.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gaztanaga, E.

AU - Giannini, G.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gutierrez, G.

AU - Hinton, S. R.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - James, D. J.

AU - Lee, S.

AU - Marshall, J. L.

AU - Mena-Fernández, J.

AU - Miquel, R.

AU - Palmese, A.

AU - Pieres, A.

PY - 2025/3/1

Y1 - 2025/3/1

N2 - The weak gravitational lensing magnification of Type Ia supernovae (SNe Ia) is sensitive to the matter power spectrum on scales k > 1h Mpc−1, making it unwise to interpret SNe Ia lensing in terms of power on linear scales. We compute the probability density function of SNe Ia magnification as a function of standard cosmological parameters, plus an empirical parameter Amod which describes the suppression or enhancement of matter power on non-linear scales compared to a cold dark matter only model. While baryons are expected to enhance power on the scales relevant to SN Ia lensing, other physics such as neutrino masses or non-standard dark matter may suppress power. Using the Dark Energy Survey Year-5 sample, we find Amod = 0.77+−00.4069 (68 per cent credible interval around the median). Although the median is consistent with unity there are hints of power suppression, with Amod < 1.09 at 68 per cent credibility.

AB - The weak gravitational lensing magnification of Type Ia supernovae (SNe Ia) is sensitive to the matter power spectrum on scales k > 1h Mpc−1, making it unwise to interpret SNe Ia lensing in terms of power on linear scales. We compute the probability density function of SNe Ia magnification as a function of standard cosmological parameters, plus an empirical parameter Amod which describes the suppression or enhancement of matter power on non-linear scales compared to a cold dark matter only model. While baryons are expected to enhance power on the scales relevant to SN Ia lensing, other physics such as neutrino masses or non-standard dark matter may suppress power. Using the Dark Energy Survey Year-5 sample, we find Amod = 0.77+−00.4069 (68 per cent credible interval around the median). Although the median is consistent with unity there are hints of power suppression, with Amod < 1.09 at 68 per cent credibility.

KW - cosmology: cosmological parameters

KW - cosmology: dark matter

KW - galaxies: haloes

KW - gravitational lensing: weak

KW - transients: supernovae

KW - UKRI

KW - STFC

UR - https://www.scopus.com/pages/publications/85218928883

U2 - 10.1093/mnras/staf286

DO - 10.1093/mnras/staf286

M3 - Article

AN - SCOPUS:85218928883

SN - 0035-8711

VL - 537

SP - 3814

EP - 3825

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -