Testing Dynamical Dark-Energy Model with Standard Sirens
Abstract
Bright standard sirens from the Einstein Telescope (ET) provide an independent probe of cosmic expansion. In this article, we test whether future ET observations can constrain a dynamical dark-energy scenario inspired by DESI DR2. Using the best-fitting 29-bin dark-energy equation of state as the fiducial cosmology, we generate mock catalogs of 100, 500, 1000, and 3000 binary-neutron-star standard sirens with known host redshifts, and reconstruct the equation of state using both GW-only data and combined analyses with DESI DR2 BAO, BBN, and a compressed CMB constraint. The effective numbers of constrained modes are Neff∼ 4−5 (GW-only) and 5−6 (combined), with information concentrated in a few correlated modes. The GW3000 catalog yields a departure from ΛCDM exceeding 5σ, and combined analyses reach similar significance for O(103) events. Comparing flat ΛCDM with its Chevallier-Polarski-Linder extension using GW data alone gives significances of 3.3σ and 6.3σ for 1000 and 3000 events, rising to 7.7σ and 11.0σ with external data. These results indicate that a few thousand ET bright standard sirens could provide a sensitive test of departures from ΛCDM.
Related
- Testing ΛLTB as an alternative to dynamical dark energy
- Reconsidering the role of bright and dark gravitational-wave standard sirens for cosmology
- A gaussian-process reconstruction of gravitational-wave friction from dark standard sirens
- Testing ΛCDM versus Dynamical Dark Energy in 1 Yr: A DESI Spectroscopic Follow-up Program for Rubin Supernovae
- Cosmology beyond standard sirens: cross-correlation of gravitational waves and neutral hydrogen intensity mapping
BibTeX
@misc{mao2026testing,
title = {{Testing Dynamical Dark-Energy Model with Standard Sirens}},
author = {Yuanmin Mao and Wen Zhao},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29908},
eprint = {2610.29908},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29908},
}
RIS
TY - UNPB
TI - Testing Dynamical Dark-Energy Model with Standard Sirens
AU - Yuanmin Mao
AU - Wen Zhao
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29908
UR - https://arxiv.org/abs/2610.29908
AB - Bright standard sirens from the Einstein Telescope (ET) provide an independent probe of cosmic expansion. In this article, we test whether future ET observations can constrain a dynamical dark-energy scenario inspired by DESI DR2. Using the best-fitting 29-bin dark-energy equation of state as the fiducial cosmology, we generate mock catalogs of 100, 500, 1000, and 3000 binary-neutron-star standard sirens with known host redshifts, and reconstruct the equation of state using both GW-only data and combined analyses with DESI DR2 BAO, BBN, and a compressed CMB constraint. The effective numbers of constrained modes are N_eff∼ 4−5 (GW-only) and 5−6 (combined), with information concentrated in a few correlated modes. The GW3000 catalog yields a departure from ΛCDM exceeding 5σ, and combined analyses reach similar significance for O(10^3) events. Comparing flat ΛCDM with its Chevallier-Polarski-Linder extension using GW data alone gives significances of 3.3σ and 6.3σ for 1000 and 3000 events, rising to 7.7σ and 11.0σ with external data. These results indicate that a few thousand ET bright standard sirens could provide a sensitive test of departures from ΛCDM.
ER -