Results 1 to 10 of about 4,402,515 (251)

CASCO: Cosmological and AStrophysical parameters from Cosmological simulations and Observations [PDF]

Astronomy & Astrophysics
Small-scale discrepancies in the standard Lamda cold dark matter paradigm have motivated the exploration of alternative dark matter (DM) models, such as warm dark matter (WDM).
Silvestrini M., Tortora C., Busillo V., Brooks Alyson M., Farahi A., Garcia A. M., Kallivayalil N., Napolitano N. R., Rose J. C., Torrey P., Villaescusa-Navarro F., Vogelsberger M.   +11 more
doaj   +2 more sources

Cosmic Chronometers, Pantheon+ Supernovae, and Quasars Favor Coasting Cosmologies over the Flat ΛCDM Model

The Astrophysical Journal
We test and compare coasting cosmological models with curvature parameters $k=\left\{-1,0,+1\right\}$ in ${H}_{0}^{2}{c}^{-2}$ units and the flat ΛCDM model by fitting them to cosmic chronometers (CCs), the Pantheon+ sample of Type Ia supernovae (SNe ...
Peter Raffai, Adrienn Pataki, Rebeka L. Böttger, Alexandra Karsai, Gergely Dálya   +4 more
doaj   +1 more source

Cosmological Parameters and Gravitational Lensing Statistics [PDF]

Annals of the New York Academy of Sciences, 1995
The general idea of determining cosmological parameters with gravitational lensing statistics is outlined, and then recent work---with an emphasis on applicability to all cosmological models, observational bias, better statistics and robustness testing through numerical simulations---is discussed with relevance to a scheme originally introduced by ...
openaire   +3 more sources

Cosmological parameters [PDF]

Nuclear Physics B - Proceedings Supplements, 2000
G. Theureau, G.A. Tammann
openaire   +2 more sources

Distinguishing ΛCDM from Evolving Dark Energy with Om Two-point Statistics: Implications from the Space-borne Gravitational-wave Detector

The Astrophysical Journal
The Omh ^2 ( z _i , z _j ) two-point diagnostics was proposed as a litmus test of the ΛCDM model, and measurements of the cosmic expansion rate H ( z ) have been extensively used to perform this test.
Yuting Liu, Shuo Cao, Xiaogang Zheng, Marek Biesiada, Jianyong Jiang, Tonghua Liu   +5 more
doaj   +1 more source

Cosmology with the angular cross-correlation of gravitational-wave and galaxy catalogs: Forecasts for next-generation interferometers and the Euclid survey

Astronomy & Astrophysics
Context. The spatial clustering of galaxies has long been a key probe of cosmology. Gravitational–wave (GW) sources, which provide direct luminosity–distance measurements, have recently emerged as a complementary tracer of large–scale structures.
Pedrotti Alessandro, Mancarella Michele, Bel Julien, Santoni Michele, Gerosa Davide   +4 more
doaj   +1 more source

Newest Measurements of Cosmic Curvature with BOSS/eBOSS and DESI DR1 Baryon Acoustic Oscillation Observations

The Astrophysical Journal Letters
Determining the cosmic curvature (Ω _K ) independent of cosmological models plays a key role in revealing the background physics of our Universe. In this Letter, we propose an improved method to measure the cosmic curvature using the observations of ...
Tonghua Liu, Shengjia Wang, Hengyu Wu, Shuo Cao, Jieci Wang   +4 more
doaj   +1 more source

The Local Distance Network: A community consensus report on the measurement of the Hubble constant at ∼1% precision

Astronomy & Astrophysics
Context. The direct empirical determination of the local value of the Hubble constant (H0) has markedly advanced thanks to improved instrumentation, measurement techniques, and distance estimators.
Casertano Stefano, Anand Gagandeep, Anderson Richard I., Beaton Rachael, Bhardwaj Anupam, Blakeslee John P., Boubel Paula, Breuval Louise, Brout Dillon, Cantiello Michele, Cruz Reyes Mauricio, Csörnyei Geza, de Jaeger Thomas, Dhawan Suhail, Di Valentino Eleonora, Galbany Lluís, Gil-Marín Héctor, Graczyk Dariusz, Huang Caroline, Jensen Joseph B., Kervella Pierre, Leibundgut Bruno, Lengen Bastian, Li Siyang, Macri Lucas, Özülker Emre, Pesce Dominic W., Riess Adam, Romaniello Martino, Said Khaled, Schöneberg Nils, Scolnic Dan, Sicignano Teresa, Skowron Dorota M., Uddin Syed A., Verde Licia, Nota Antonella   +36 more
doaj   +1 more source

Cosmological Parameters

, 2001
This article briefly summarizes the increasingly precise observational estimates of the cosmological parameters. After three years on the stump, the Lambda-CDM model is still the leading candidate. Although the Universe is expanding, our picture of it is coming together.
openaire   +2 more sources

New Tests of the Cosmic Distance Duality Relation with DESI 2024 Baryon Acoustic Oscillation Observations

The Astrophysical Journal
In this paper, we test the cosmic distance duality relation (CDDR), as required by the Etherington reciprocity theorem, which connects the angular diameter distance and the luminosity distance via the relation D _L ( z ) =  D _A ( z )(1 +  z ) ^2 .
Qiumin Wang, Shuo Cao, Jianyong Jiang, Kaituo Zhang, Xinyue Jiang, Tonghua Liu, Chengsheng Mu, Dadian Cheng   +7 more
doaj   +1 more source