Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.26727

Cosmological implications of two mock TianQin standard siren catalogs generated under different background cosmological models

Jun-Xian Li·Shuang Wang·Liang-Gui Zhu
View original source ↗Read source document ↗Export metadata ↓

Abstract

Space-borne gravitational wave (GW) detectors such as TianQin are expected to detect GW standard sirens for cosmological parameter estimation. All previous studies of TianQin adopted the $Λ$CDM model to generate mock standard siren data. In this work, we quantitatively investigate how the choice of background cosmological model affects mock TianQin standard siren (TQSS) catalogs and the corresponding cosmological implications. Adopting the $Λ$CDM model and a redshift-binned dark energy (DE) reconstruction model (the wbin model), we consider the bright standard sirens from massive black hole binary mergers and generate two mock TQSS catalogs, i.e. TQSS1 and TQSS2, respectively. We investigate the difference of the catalogs and further explore their cosmological implications within the Chevallier-Polarski-Linder (CPL) model, both individually and in combination with DESI DR2 baryon acoustic oscillation (BAO) data, $\textit{Planck}$ 2018 cosmic microwave background (CMB) data, and DESY5 type Ia supernova (SN Ia) data. We find that there are only small differences between TQSS1 and TQSS2 catalogs, with a maximum relative difference of $1.48\%$ in the distance-redshift relation. In addition, either the TQSS1 or TQSS2 catalog alone gives cosmological constraints similar to those obtained from SN data, implying that these two catalogs can serve as a complement to mainstream cosmological observations. Most importantly, we find that both TQSS1+DESI DR2+CMB+DESY5 and TQSS2+DESI DR2+CMB+DESY5 are still expected to favor dynamical DE, with these two combinations showing a preference for dynamical DE at $2.3σ$ and $3.8σ$, respectively. Adopting different massive black hole seed models does not impact the cosmological implications of the mock TQSS catalogs. Our study indicates the importance of considering different cosmological models in the standard siren forecasts for DE.

Explore related subjects

astro-ph.COgr-qc

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Jun-Xian Li, Shuang Wang, Liang-Gui Zhu. 2026-10-19. Cosmological implications of two mock TianQin standard siren catalogs generated under different background cosmological models. https://arxiv.org/abs/2610.26727

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Dark Energy Survey Year 6 Results: improved mitigation of spatially varying observational systematics with masking for the MagLim++ lens sample

As photometric surveys reach unprecedented statistical precision, systematic uncertainties increasingly dominate large-scale structure probes relying on galaxy number density. Defining the final survey footprint is critical, as it excludes regions affected by artefacts or suboptimal observing conditions. For galaxy clustering, spatially varying observational systematics, such as seeing, are a leading source of bias. Template maps of contaminants are used to derive spatially dependent corrections, but extreme values may fall outside the applicability range of mitigation methods, compromising correction reliability. The complexity and accuracy of systematics modelling depend on footprint conservativeness, with aggressive masking enabling simpler, robust mitigation. We present a unified approach to define the DES Y6 JOINT footprint, integrating observational systematics templates and artefact indicators that degrade mitigation performance. This removes extreme values from an initial SEED footprint, leading to the final JOINT footprint. By evaluating the DES Y6 lens sample MagLim++ on this footprint, we enhance the Iterative Systematics Decontamination (ISD) method, detecting non-linear systematic contamination and improving correction accuracy. While the mask's impact on clustering is less significant than systematics decontamination, it remains non-negligible, comparable to statistical uncertainties in certain w(theta) scales and redshift bins. Supporting coherent analyses of galaxy clustering and cosmic shear, the final footprint spans 4,031.04 deg2, setting the basis for DES Y6 1x2pt, 2x2pt, and 3x2pt analyses. This work highlights how targeted masking strategies optimise the balance between statistical power and systematic control in Stage-III and -IV surveys.

astro-ph.CO↗
arXiv2026

Structure and evolution of cosmic voids within DESI DR1

Ongoing stage IV galaxy surveys such as DESI or Euclid offer an unprecedented amount of information to study the large-scale structure of the Universe by mapping tens of millions of galaxies. Within the context of cosmic voids, already released and future catalogues will help better understand the void structure and evolution as well as the cosmological model constraints derived from their statistics. With the recent DESI Data Release 1, our aim is to obtain a new void catalogue that allows us to study the properties of cosmic voids at different redshifts, hence providing insight not only on their structure but also on their evolution. We select the DESI BGS and LRG samples for this study. Before the void-finding process, the data goes through a preprocessing pipeline tackling redshift space distortions and reconstructing the mildly non-linear velocity field. After that, the new AVISM void finder is applied to the preprocessed data, obtaining two void catalogues in different redshift bins (0.1 < z < 0.3 and 0.4 < z < 0.8), both within a 1400^3 cMpc^3 cube. We successfully recover N_BGS = 1114 and N_LRG = 216 clean voids with sizes up to ~ 65 cMpc. The void size function, 3D shape variables, density profiles, and linear bias are obtained and analysed. Both the size function and the density profiles obtained are in agreement with previous theoretical studies. The expected mass depletion in void evolution is shown by the evolution of density profiles. We obtain a roughly constant linear bias inside r < Re with mean values of 1.31 +/- 0.02 and 2.14 +/- 0.04 for BGS and LRG, respectively. Both void catalogues are publicly released.

astro-ph.CO↗
arXiv2026

Consistently Reproducing Early Galaxy Observations and 21-cm Signal during the Epoch of Reionization

In the standard cosmological model, galaxies forming within dark matter haloes are the primary drivers of the Epoch of Reionization (EoR). The complex physics of galaxy formation introduces scatter in the relation between halo mass and star-formation activity, with implications for the production and escape of ionising photons. In this work, we implement a stochastic source model in our cosmological radiative transfer simulations. We calibrate our model against the high-redshift ultraviolet luminosity function observed by JWST and observational constraints on Lyman-continuum leakage to constrain the ionising escape fraction. We find that stochastic star formation redistributes ionising emissivity toward lower-mass haloes, producing a more fragmented ionisation topology and delaying the growth of the largest ionised regions relative to the deterministic, observationally calibrated model. However, when the two models match total ionising photon production, their global neutral fractions and 21-cm power spectrum remain nearly indistinguishable, despite small differences in the morphology of individual ionised regions. Additionally, we establish a unified framework that lets us apply source models derived from computationally expensive hydrodynamical simulations (SPICE, FIRE-2 and Thesan) and investigate their impact on large-volume reionisation simulations, extending their prescriptions to scales of >100 Mpc. We find that these prescriptions produce distinct ionisation topologies and 21-cm statistical signatures, even when their global reionisation histories are similar. Our results highlight the importance of combining physically motivated galaxy formation prescriptions from hydrodynamical simulations with large-volume radiative transfer simulations to interpret forthcoming 21-cm observations and constrain the sources of cosmic reionisation.

astro-ph.CO↗