Results 71 to 80 of about 13,060 (254)
Boomerang returns unexpectedly [PDF]
, 2000 Experimental study of the anisotropy in the cosmic microwave background (CMB) is gathering momentum. The eagerly awaited Boomerang results have lived up to expectations.
Bennett C. L. +10 more
core +3 more sources
Fortschritte der Physik, Volume 73, Issue 3, March 2025.Abstract Current observations show that a significant fraction of the Universe is composed of dark energy and dark matter. In this paper, the simultaneous effects of these dark sectors on the Euler–Heisenberg black hole are investigated, using the quintessence matter field and perfect fluid to model them. In particular, the black hole's thermodynamics,
Bilel Hamil, Bekir Can Lütfüoğlu
wiley +1 more source
Generalization of the Randall‐Sundrum Model Using Gravitational Model F(T, Θ)
Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018 In this letter, we explore a generalized model based on two scenarios including the Randall‐Sundrum model and gravity model F(T, Θ). We first study the standard Randall‐Sundrum gravitational model and then add a function containing two parameters as torsion and trace energy‐momentum tensor to the main action of the model.
S. Davood Sadatian +2 more
wiley +1 more source
The Astrophysical JournalThe standard cosmological model is in the midst of a stress test, thanks to the tension between supernova-based measurements of the Hubble constant H _0 and inferences of its values from cosmic microwave background (CMB) anisotropies.
Kazem Rezazadeh +2 more
doaj +1 more source
Detecting the Baryons in Matter Power Spectra
, 2002 We examine power spectra from the Abell/ACO rich cluster survey and the 2dF Galaxy Redshift Survey (2dfGRS) for observational evidence of features produced by the baryons. A non-negligible baryon fraction produces relatively sharp oscillatory features at
Benjamini Y. +3 more
core +1 more source
Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data [PDF]
, 2010 This paper is a review on the observational Hubble parameter data that have gained increasing attention in recent years for their illuminating power on the dark side of the universe --- the dark matter, dark energy, and the dark age. Currently, there are
Lan, Tian, Ma, Cong, Zhang, Tong-Jie
core +3 more sources
A GROUND-BASED 21 cm BARYON ACOUSTIC OSCILLATION SURVEY [PDF]
The Astrophysical Journal, 2010 Baryon acoustic oscillations (BAO) provide a robust standard ruler with which to measure the acceleration of the Universe. The BAO feature has so far been detected in optical galaxy surveys. Intensity mapping of neutral hydrogen emission with a ground-based radio telescope provides another promising window for measuring BAO at redshifts of order unity ...
Seo, Hee-Jong +6 more
openaire +2 more sources
On the Square Speed of Sound in High‐Energy Collisions: Range of Values and How to Understand It
Advances in High Energy Physics, Volume 2025, Issue 1, 2025.After reviewing the sound speeds in various forms and conditions of matter, we investigate the sound speed of hadronic matter that has decoupled from the hot and dense system formed during high‐energy collisions. We comprehensively consider factors such as energy loss of the incident beam, rapidity shift of leading nucleons, and the Landau hydrodynamic
Ting-Ting Duan +3 more
wiley +1 more source
Inflation in f(R, ϕ) Gravity with Exponential Model
Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018 We are taking action of f(R) gravity with a nonminimal coupling to a massive inflaton field. A f(R, ϕ) model is chosen which leads to the scalar-tensor theory which can be transformed to Einstein frame by conformal transformation. To avoid the vagueness of the frame dependence, we evaluate the exact analytical solutions for inflationary era in Jordan ...
Farzana Kousar +3 more
wiley +1 more source
Status on Bidimensional Dark Energy Parameterizations Using SNe Ia JLA and BAO Datasets
Galaxies, 2016 Using current observations of forecast type Ia supernovae (SNe Ia) Joint Lightcurve Analysis (JLA) and baryon acoustic oscillations (BAO), in this paper we investigate six bidimensional dark energy parameterizations in order to explore which has more ...
Celia Escamilla-Rivera
doaj +1 more source