Results 11 to 20 of about 4,634,710 (292)

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 ...
PHILLIP HELBIG, Helbig, Phillip
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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

MEASUREMENT OF COSMOLOGICAL PARAMETERS

Science with the New Generation of High Energy Gamma-Ray Experiments, 2006
The study of the cosmic microwave background (CMB) has played a crucial role in establishing a new standard of precision in the determination of cosmological parameters. The full-sky, high-resolution maps of the CMB recently produced by the WMAP space mission, have reinforced the evidence in favor of a fiat universe, dominated by dark matter and dark ...
Balbi A., AMEDEO BALBI
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Cosmological Constraints on Mirror Matter Parameters [PDF]

Advances in High Energy Physics, 2014
Up-to-date estimates of the cosmological parameters are presented as a result of numerical simulations of cosmic microwave background and large scale structure, considering a flat Universe in which the dark matter is made entirely or partly of mirror ...
Paolo Ciarcelluti, Quentin Wallemacq
doaj   +3 more sources

Cosmic time for multi-component universe [PDF]

Serbian Astronomical Journal, 2020
We determined Weierstrass canonical form of cosmic time formula in the cases of four-component and some three-component universe, assuming the ΛCDM model. In all other cases, we discussed analytical solutions for the cosmic time formula.
Branković D.
doaj   +1 more source

Constraining Cosmological Parameters Using the Splashback Radius of Galaxy Clusters [PDF]

The Astrophysical Journal
Cosmological parameters such as Ω _M and σ _8 can be measured indirectly using various methods, including galaxy cluster abundance and cosmic shear. These measurements constrain the composite parameter S _8 , leading to degeneracy between Ω _M and σ _8 .
Roan Haggar, Yuba Amoura, Charlie T. Mpetha, James E. Taylor, Kris Walker, Chris Power   +5 more
doaj   +3 more sources

A Short Review on the Latest Neutrinos Mass and Number Constraints from Cosmological Observables

Universe, 2022
We review the neutrino science, focusing on its impact on cosmology along with the latest constraints on its mass and number of species. We also discuss its status as a possible solution to some of the recent cosmological tensions, such as the Hubble ...
Ziad Sakr
doaj   +1 more source

Designing an Optimal LSST Deep Drilling Program for Cosmology with Type Ia Supernovae

The Astrophysical Journal Supplement Series, 2023
The Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) is forecast to collect a large sample of Type Ia supernovae (SNe Ia) expected to be instrumental in unveiling the nature of dark energy.
Philippe Gris, Nicolas Regnault, Humna Awan, Isobel Hook, Saurabh W. Jha, Michelle Lochner, Bruno Sanchez, Dan Scolnic, Mark Sullivan, Peter Yoachim, The LSST Dark Energy Science Collaboration   +10 more
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Cosmological Parameters Are Dressed [PDF]

Physical Review Letters, 2003
In the context of the averaging problem in relativistic cosmology, we provide a key to the interpretation of cosmological parameters by taking into account the actual inhomogeneous geometry of the Universe. We discuss the relation between `bare' cosmological parameters determining the cosmological model, and the parameters interpreted by observers with
T. BUCHERT, CARFORA, MAURO
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Cosmological parameters [PDF]

Second international workshop on particle physics and the early universe (COSMO-98), 1999
The discussion of cosmological parameters used to be a source of embarrassment to cosmologists. Today, measurements of the cosmological parameters are leading the way into the era of precision cosmology. The CMB temperature is measured to four significant figures, T_0=2.7277+/-0.002 K; the Hubble constant is now determined with a reliable error ...
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