Results 51 to 60 of about 170,764 (173)

Constraining dark energy with gamma-ray bursts [PDF]

, 2010
We use the measurement of gamma-ray burst (GRB) distances to constrain dark energy cosmological model parameters. We employ two methods for analyzing GRB data - fitting luminosity relation of GRBs in each cosmology and using distance measures computed ...
Alam, Arun, Bharat Ratra, Capozziello, Casarini, Chae, Chen, Chen, Daly, Dent, Dev, Di Girolamo, Dunkley, Eisenstein, Fernandez-Martinez, Francis, Friedman, Frieman, Ghirlanda, Gong, Grossi, Hicken, Jamil, Komatsu, Kowalski, Lado Samushia, Lamb, Lamb, Liang, Mosquera Cuesta, Mészáros, Mörtsell, Nemiroff, Page, Perivolaropoulos, Podariu, Podariu, Podariu, Primack, Sami, Samushia, Samushia, Samushia, Samushia, Samushia, Schaefer, Silvestri, Tsutsui, Xu   +48 more
core   +1 more source

Non-minimal coupling influence on the deviation from de Sitter cosmological expansion

, 2018
We investigate the models of cosmological inflation in generalized scalar-tensor gravity, which we consider as a source of deviation from de Sitter dynamics in the case of GR.
Chervon, Sergey V., Fomin, Igor V.
core   +1 more source

Non-Gaussian Error Contribution to Likelihood Analysis of the Matter Power Spectrum [PDF]

, 2010
We study the sample variance of the matter power spectrum for the standard Lambda Cold Dark Matter universe. We use a total of 5000 cosmological N-body simulations to study in detail the distribution of best-fit cosmological parameters and the baryon ...
Atsushi Taruya, Blake, Cooray, Dore, Eisenstein, Eisenstein, Eisenstein, Gaztanaga, Heitmann, Issha Kayo, Jeong, Jeong, Kazin, Kim, Komatsu, Lee, Lewis, Masahiro Takada, Matarrese, Matsubara, Naoki Yoshida, Naoshi Sugiyama, Neyrinck, Nishimichi, Nishimichi, Nomura, Okumura, Pietroni, Rassat, Ryuichi Takahashi, Sato, Scoccimarro, Seo, Seo, Seo, Seo, Shoji, Shun Saito, Smith, Spergel, Takahashi, Takahashi, Takahiko Matsubara, Takahiro Nishimichi, Taruya, Tegmark   +45 more
core   +3 more sources

Deformation of the quintom cosmological model and its consequences

, 2017
In this paper, we investigate the effects of non-commutative phase-space on the quintom cosmological model. In that case, we discuss $\Lambda_{1}$, $\Lambda_{2}$ and other cosmological parameters and show that they are associated to deformation ...
Nekouee, Z., Pourhassan, B., Sadeghi, J., Shokri, M.   +3 more
core   +1 more source

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

ΛCDM Tensions: Localising Missing Physics through Consistency Checks

Universe
ΛCDM tensions are by definition model-dependent; one sees anomalies through the prism of ΛCDM. Thus, progress towards tension resolution necessitates checking the consistency of the ΛCDM model to localise missing physics either in redshift or scale ...
Özgür Akarsu, Eoin Ó Colgáin, Anjan A. Sen, M. M. Sheikh-Jabbari   +3 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

Dependence of Inflationary Reconstruction upon Cosmological Parameters

, 1995
The inflationary potential and its derivatives determine the spectrum of scalar and tensor metric perturbations that arise from quantum fluctuations during inflation.
A. A. Starobinskii, A. A. Starobinskii, A. G. Doroshkevich, A. G. Doroshkevich, A. H. Guth, A. Kosowsky, A. R. Liddle, A. R. Liddle, A. R. Liddle, A. R. Liddle, D. H. Lyth, E. J. Copeland, E. J. Copeland, E. J. Copeland, E. J. Copeland, E. J. Copeland, F. Lucchin, G. Efstathiou, G. Efstathiou, J. M. Bardeen, J. P. Ostriker, J. Silk, J. Silk, L. F. Abbott, L. F. Abbott, L. Knox, L. Knox, L. Kofman, L. Krauss, M. Kamionkowski, M. S. Turner, M. S. Turner, M. S. Turner, M. S. Turner, M. S. Turner, M. S. Turner, M. S. Turner, M. White, M. White, Martin White, Michael S. Turner, N. Sugiyama, P. J. E. Peebles, P. J. E. Peebles, P. J. E. Peebles, R. Fabbri, R. K. Sachs, S. M. Carroll, S. W. Hawking, V. A. Rubakov   +49 more
core   +1 more source

Cosmological Constant of the $(p+1)$-Dimensional World, Embedded in the $d$-Dimensional Bulk Space [PDF]

, 2006
In this manuscript we study the cosmological constant of a $(p+1)$-dimensional world, which lives in the higher dimensional bulk space. We assume the extra dimensions are compact on tori.
A. Krause, A.D. Linde, C. Gomez, C.P. Burgess, Davoud Kamani, I. Antoniadis, L. Randall, L. Randall, M. Ito, N. Arkani-Hamed, N. Arkani-Hamed, R. Easther, S. Forste, S. Kachru, S. Weinberg, S. Weinberg, S.M. Carroll, S.P. Alwis de, T. Banks, T. Padmanabhan, T. Torii   +20 more
core   +4 more sources

COSMOLOGICAL PARAMETERS: FASHION AND FACTS [PDF]

New Worlds in Astroparticle Physics, 2003
We are at a specific period of modern cosmology, during which the large increase of the amount of data leads to the idea that the determination of cosmological parameters has been achieved with a rather good precision. There is a large consensus around the so-called concordance model.
openaire   +2 more sources