Prépublication
· 2026 arXiv
EN
Weak-lensing magnification complements cosmic shear through its effects on galaxy fluxes, sizes, and number counts. We derive the optimal magnification statistics from galaxy properties and show that the optimal measurement can be decomposed into an optimal me...
Kun Xu, Ravi K. Sheth
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Tomographic weak gravitational lensing probes cosmic structure growth and geometry, making it a powerful probe of dynamical dark energy. We forecast information beyond the lensing power spectrum from non-Gaussian statistics of tomographic galaxy and CMB lensin...
Shu-Fan Chen, J. Colin Hill et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
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...
Yuanmin Mao, Wen Zhao
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
Primordial tensor non-Gaussianity can probe massive particles present during inflation. We investigate this possibility in an effective field theory where the massless graviton mixes with the helicity-two mode of an additional massive spin-two field $σ_{ij}$ w...
Sukannya Bhattacharya, Matteo Fasiello et al.
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Prépublication
· 2026 arXiv
EN
The recent measurement of baryon acoustic oscillations by the Dark Energy Spectroscopic Instrument reveals a mild tension with observations of the cosmic microwave background (CMB) within the standard $Λ$CDM cosmological model. Another interesting hint beyond...
Salvatore Samuele Sirletti, Toshiya Namikawa et al.
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Prépublication
· 2026 arXiv
EN
We use the monopole and quadrupole power spectra of [\ion{O}{2}]-emitting galaxies in the HETDEX Public Data Release 1 to constrain the growth of cosmic structures at $z\le0.48$. We interpret the power spectra using a simulation-based model built from the Much...
Jeongin Moon, Eiichiro Komatsu et al.
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Prépublication
· 2026 arXiv
EN
We study the cosmology of self-interacting ultralight dark matter. The scalar field evolves from an early Hubble-frozen phase to a quartic-dominated radiation-like phase and finally to a quadratic matter-like phase. The intermediate phase increases the pre-rec...
Seokcheon Lee, Jae-Weon Lee
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We derive explicit expressions for the primordial scalar and tensor spectra at arbitrary finite order $p$ in the slow-roll expansion, valid both for canonical single-field inflation and $k$-inflation. At any order, the spectra are determined by known combinati...
William Giarè
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
In the Dark Ages, minihalos above the Jeans mass accrete gas from the intergalactic medium (IGM). The accreted gas would be heated to virial temperature and produces 21 cm signal in emission, while the majority of gas retained in the IGM is cold and has 21 cm...
Yan Dong, Bin Yue et al.
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Prépublication
· 2026 arXiv
EN
Cosmic filaments connect the nodes of the large-scale web and are thought to harbour a substantial fraction of the low-z baryon budget, yet a physically motivated framework for organising their diverse gas properties has been lacking. Here we show that the lin...
Daniela Galárraga-Espinosa, Daisuke Nagai et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
We revisit a late-time, model-independent distance-consistency framework that combines strong gravitational lensing systems (SGLS), ultraviolet/X-ray quasars (QSOs), and 38 Sunyaev--Zel'dovich/X-ray galaxy-cluster angular-diameter distances. The analysis focus...
Jian Hu, Yi Liu et al.
#astro-ph.CO
Prépublication
· 2026 arXiv
EN
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 quant...
Jun-Xian Li, Shuang Wang et al.
#astro-ph.CO