Results 41 to 50 of about 12,766 (215)

Accuracy of cosmological parameters using the baryon acoustic scale [PDF]

, 2014
Percent-level measurements of the comoving baryon acoustic scale standard ruler can be used to break degeneracies in parameter constraints from the CMB alone.
Lewis, Antony, Thepsuriya, Kiattisak
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, Renata Kallosh, Andrei Linde, Valeri Vardanyan   +3 more
wiley   +1 more source

Ho’oleilana: An Individual Baryon Acoustic Oscillation?

The Astrophysical Journal, 2023
Theory of the physics of the early hot universe leads to a prediction of baryon acoustic oscillations (BAOs) that has received confirmation from the pairwise separations of galaxies in samples of hundreds of thousands of objects.
R. Brent Tully, Cullan Howlett, Daniel Pomarède   +2 more
doaj   +1 more source

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, Simran Arora, Phongpichit Channuie, P. K. Sahoo   +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, Ayesha Ikram, Antonio J. Accioly   +2 more
wiley   +1 more source

Theoretical uncertainty in baryon oscillations

, 2004
We discuss the systematic uncertainties in the recovery of dark energy properties from the use of baryon acoustic oscillations as a standard ruler. We demonstrate that while unknown relativistic components in the universe prior to recombination would ...
D. J. Eisenstein, Daniel Eisenstein, E. Pierpaoli, Martin White, O. Elgaroy, S. Hannestad, S. Seager   +6 more
core   +1 more source

The Acoustic Peak in the Lyman Alpha Forest [PDF]

, 2009
We present the first simulation of the signature of baryonic acoustic oscillations (BAO) in Lyman alpha forest data containing 180,000 mock quasar sight-lines.
A.A. Meiksin, Anže Slosar, D.J. Eisenstein, D.J. Eisenstein, D.J. Eisenstein, L. Hui, M. Zaldarriaga, M.J. White, Martin White, N. Kaiser, P. McDonald, R.A.C. Croft, R.A.C. Croft, SDSS collaboration, Shirley Ho, T. Theuns ., T.T. Fang, Thibaut Louis, WMAP collaboration   +18 more
core   +1 more source

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

Baryon Acoustic Oscillations Analyses with Density-split Statistics

The Astrophysical Journal
Accurate modeling for the evolution of the baryon acoustic oscillation (BAO) is essential for using it as a standard ruler to probe cosmology. We explore the nonlinearity of the BAO in different environments using the density-split statistics and compare
Tengpeng Xu, Yan-Chuan Cai, Yun Chen, Mark Neyrinck, Liang Gao, Qiao Wang   +5 more
doaj   +1 more source