What question did this study set out to answer?

The aim is to evaluate future singularity dark energy models against late-time geometric data.

January 6, 2026Universe0 citationsOpen Access

Late-Time Constraints on Future Singularity Dark Energy Models from Geometry and Growth

TDTomasz DenkiewiczUniversity of Szczecin

Key Points

The aim is to evaluate future singularity dark energy models against late-time geometric data.
Utilized late-time geometric probes and redshift-space distortion growth data.
Computed observable growth by solving the linear perturbation system.
Analyzed data from Pantheon+SH0ES, H(z), DESI AP-only BAO, and fσ8.
Conducted parameter constraints via grid-based profiling over nuisance parameters.
Compared singularity scenarios' fit to the ΛCDM reference.
Identified the relationships between dark energy models and redshift-space distortion growth.
Established parameter constraints and identified nuisance parameters affecting model viability.
Found varying degrees of goodness of fit among singularity scenarios compared to ΛCDM.

Abstract

We confront two future-singularity dark-energy templates—sudden future singularities (SFSs) and finite scale factor singularities (FSFSs)—with late-time geometric probes and redshift-space distortion growth data. We compute the observable growth fσ8(z) by solving the full linear perturbation system (including the standard fiducial cosmology rescaling of RSD measurements) and build a joint χ2 from Pantheon+SH0ES SNe Ia, H(z), DESI AP-only BAO, and fσ8. Parameter constraints are obtained via grid-based profiling over nuisance parameters and the singularity time location parameter. We compare the viability and goodness of fit of the singularity scenarios to the ΛCDM reference.

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