Exploring alternative cosmologies with the LSST: Simulated forecasts and current observational constraints

Kumar D. Mitra A. Adil S.A. Sen A.A.
15 February 2025 American Physical Society

Physical Review D
2025 #111 Issue 4

The Lambda cold dark matter (ΛCDM) model, while pivotal in cosmological studies, has faced significant challenges due to emerging observational and theoretical inconsistencies. In this work, we analyze constraints on dynamic dark energy models - Chevallier-Polarski-Linder (CPL), Barboza-Alcaniz (BA), Jassal-Bagla-Padmanabhan (JBP), Scaled CPL (SCPL), and Generalized Chaplygin Gas (GCG) - using current datasets, including PantheonPlus, Union, the Dark Energy Survey 5-Year (DESY5) supernova compilations, and baryon acoustic oscillation (BAO) measurements. Our findings reveal that, except for PantheonPlus, these datasets exhibit consistent deviations from the ΛCDM model, with significance exceeding 2σ across all considered dynamic dark energy models. We further forecast the constraining power of three years of simulated photometric Supernova Ia data from the Legacy Survey of Space and Time (LSST). Our analysis shows that LSSTs high-precision data can significantly tighten constraints on dark energy parameters, surpassing the precision of current datasets. Additionally, the inclusion of BAO measurements alongside LSST data further improves parameter constraints for all models. These results underscore the necessity of exploring dynamic dark energy frameworks as a potential resolution to the tensions within the ΛCDM paradigm and highlight LSSTs crucial role in advancing our understanding of alternative cosmologies.

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Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India
Center for AstroPhysical Surveys, National Center for Supercomputing Applications, University of Illinois Urbana-Champaign, Urbana, 61801, IL, United States
Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, 61801, IL, United States
Kazakh-British Technical University, 59 Tole Bi Street, Almaty, 050000, Kazakhstan
Instituto de Ciencias Físicas, UNAM, Cuernavaca, 62210, Mexico
Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, 110025, India

Malaviya National Institute of Technology Jaipur
Center for AstroPhysical Surveys
Department of Astronomy
Kazakh-British Technical University
Instituto de Ciencias Físicas
Centre for Theoretical Physics

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