Results 61 to 70 of about 13,060 (254)
Plasma Suppression of Large Scale Structure Formation in the Universe [PDF]
, 2007 We point out that during the reionization epoch of the cosmic history, the plasma collective effect among the ordinary matter would suppress the large scale structure formation.
Chen, Pisin, Lai, Kwang-Chang
core +2 more sources
The Landscape, the Swampland and the Era of Precision Cosmology
Fortschritte der Physik, Volume 67, Issue 1-2, January-February 2019., 2019 Abstract We review the advanced version of the KKLT construction and pure de Sitter supergravity, involving a nilpotent multiplet, with regard to various conjectures that de Sitter state cannot exist in string theory. We explain why we consider these conjectures problematic and not well motivated, and why the recently proposed alternative string theory
Yashar Akrami +3 more
wiley +1 more source
A hybrid model of viscous and Chaplygin gas to tackle the Universe acceleration
European Physical Journal C: Particles and Fields, 2021 Motivated by two seminal models proposed to explain the Universe acceleration, this paper is devoted to study a hybrid model which is constructed through a generalized Chaplygin gas with the addition of a bulk viscosity.
A. Hernández-Almada +3 more
doaj +1 more source
Skewness as a probe of baryon acoustic oscillations [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 In this study we show that the skewness S_3 of the cosmic density field contains a significant and potentially detectable and clean imprint of Baryonic Acoustic Oscillations. Although the BAO signal in the skewness has a lower amplitude than second order measures like the two-point correlation function and power spectrum, it has the advantage of a ...
Juszkiewicz, Roman +2 more
openaire +3 more sources
Cosmological Dynamics of Interacting Dark Energy and Dark Matter in f(Q)$f(Q)$ Gravity
Fortschritte der Physik, Volume 73, Issue 5, May 2025.Abstract In this work, the behavior of interacting dark energy (DE) and dark matter (DM) within a model of f(Q)$f(Q)$ gravity is explored, employing the standard framework of dynamical system analysis. The power‐law f(Q)$f(Q)$ model is considered, incorporating two different forms of interacting DE and DM: 3αHρm$3\alpha H\rho _m$ and α3HρmρDE$\frac ...
Gaurav N. Gadbail +3 more
wiley +1 more source
Cosmic Evolution of Holographic Dark Energy in f(G,T) Gravity
Advances in High Energy Physics, Volume 2019, Issue 1, 2019., 2019 The aim of this paper is to analyze the cosmological evolution of holographic dark energy in f(G,T) gravity (G and T represent the Gauss‐Bonnet invariant and trace of the energy‐momentum tensor, respectively). We reconstruct f(G,T) model through correspondence scheme using power‐law form of the scale factor.
M. Sharif +2 more
wiley +1 more source
Baryon Acoustic Oscillations from Galaxy Surveys
Brazilian Journal of PhysicsWe conducted a review of the fundamental aspects of describing and detecting the Baryon Acoustic Oscillation (BAO) feature in galaxy surveys, emphasizing the optimal tools for constraining this probe based on the type of observation. Additionally, we included new results with two spectroscopic datasets to determine the best-fit model for the power ...
Paula Ferreira, Ribamar R. R. Reis
openaire +2 more sources
Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter
Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley +1 more source
Tsallis Holographic Dark Energy with Granda‐Oliveros Scale in (n + 1)‐Dimensional FRW Universe
Advances in Astronomy, Volume 2019, Issue 1, 2019., 2019 Based on Tsallis holographic dark energy model recently proposed by using the general model of the Tsallis entropy expression, we reconstruct cosmographic parameters, q, j, κ, l, and we study their evolution in spatially flat (n + 1)‐dimensional Friedmann‐Robertson‐Walker universe using Granda‐Oliveros scale. Our results show that the universe is in an
Ayman A. Aly, Pedro H. R. S. Moraes
wiley +1 more source
Measuring the Speed of Light with Baryon Acoustic Oscillations [PDF]
Physical Review Letters, 2015 In this letter we describe a new method to use Baryon Acoustic Oscillations (BAO) to derive a constraint on the possible variation of the speed of light. The method relies on the fact that there is a simple relation between the angular diameter distance $(D_{A})$ maximum and the Hubble function $(H)$ evaluated at the same maximum-condition redshift ...
Salzano, Vincenzo +2 more
openaire +3 more sources