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  • Probing Physics beyond the Standard Model through Combined Analyses of Next-generation Type Ia Supernova, Cosmic Microwave Background, and Baryon Acoustic Oscillation Surveys

This content will become publicly available on May 29, 2027

Title: Probing Physics beyond the Standard Model through Combined Analyses of Next-generation Type Ia Supernova, Cosmic Microwave Background, and Baryon Acoustic Oscillation Surveys
Abstract Observations of Type Ia supernovae (SNe Ia), which probe the late Universe, together with baryon acoustic oscillations (BAO) and the cosmic microwave background (CMB), which probe the intermediate and early epochs, provide complementary constraints on the expansion history of the Universe. In this work, we forecast constraints on dark energy and other extensions to the standard cosmological model by combining the SN Ia sample expected from the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST), data from current and forthcoming CMB surveys, and BAO measurements from the Dark Energy Spectroscopic Instrument (DESI). For the CMB, we use temperature, polarization, and lensing power spectra (TT/EE/TE/ϕϕ) from the South Pole Telescope, the planned Advanced Simons Observatory, and a CMB-S4–like experiment. We derive constraints on ΛCDM and its extensions involving the dark energy equation-of-state parameters (w0, wa) and the sum of neutrino masses ∑mνusing a Markov Chain Monte Carlo (MCMC) sampling framework. We find that the LSST Year 3 SN Ia sample can improve upon the DES Year 5 dark energy constraints by a factor of 2−2.5×, with the gains driven primarily by the significantly higher SN Ia density in the LSST sample. Similarly, DESI-DR3 shows up to a 1.8× improvement on dark energy parameters over DR2, driven largely by the substantial increase in the low-redshift sample. Combining CMB with LSST-Y3-SN Ia and DESI-DR3-BAO yieldsσ(w0) = 0.028 andσ(wa) = 0.11 forw0waCDM cosmology with the results being largely independent of the CMB dataset. The constraints weaken by 10%–30% when freeing ∑mνand spatial curvature. Moreover, the joint analysis of the three datasets can enable a 2σ–3σdetection of ∑mν.  more » « less
Award ID(s):
2239364
PAR ID:
10704797
Author(s) / Creator(s):
; ; ; ; ; ; ; ; ; ; ; ;
Corporate Creator(s):
Publisher / Repository:
ApJ
Date Published:
Journal Name:
The Astrophysical Journal
Volume:
1003
Issue:
2
ISSN:
0004-637X
Page Range / eLocation ID:
246
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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