Results 81 to 90 of about 13,060 (254)

Cosmology with photometric redshift surveys [PDF]

, 2004
We explore the utility of future photometric redshift imaging surveys for delineating the large-scale structure of the Universe, and assess the resulting constraints on the cosmological model.
Blake, Chris, Bridle, Sarah
core   +4 more sources

Baryon Acoustic Oscillation Intensity Mapping of Dark Energy [PDF]

Physical Review Letters, 2008
The expansion of the Universe appears to be accelerating, and the mysterious antigravity agent of this acceleration has been called "dark energy." To measure the dynamics of dark energy, baryon acoustic oscillations (BAO) can be used. Previous discussions of the BAO dark energy test have focused on direct measurements of redshifts of as many as 10(9 ...
Tzu-Ching, Chang, Ue-Li, Pen, Jeffrey B, Peterson, Patrick, McDonald   +3 more
openaire   +2 more sources

Systematic Dynamical Analysis in Palatini f(R) Gravity

Advances in Astronomy, Volume 2024, Issue 1, 2024.
This paper aims to explore the evolution of the universe in the background of Palatini f(R) gravity. Considering Amendola Gannouji Polarski Tsujikawa (AGPT) f(R) gravity model, we perform a dynamical system analysis within the FLRW universe in order to analyze the impacts of this gravity model on large‐scale structure and dynamics of universe. With the
Fizza Saeed, Sehrish Iftikhar, Rubab Manzoor, Zeeshan Yousaf   +3 more
wiley   +1 more source

5σ tension between Planck cosmic microwave background and eBOSS Lyman-alpha forest and constraints on physics beyond ΛCDM

Physical Review Research
We find that combined Planck cosmic microwave background, baryon acoustic oscillations, and supernovae data analyzed under Λ cold dark matter (ΛCDM) are in 4.9σ tension with the extended Baryon Oscillation Spectroscopic Survey (eBOSS) Lyα forest in ...
Keir K. Rogers, Vivian Poulin
doaj   +1 more source

A model of interacting dark fluids tested with supernovae and Baryon Acoustic Oscillations data

Nuclear Physics B, 2019
We compare supernovae and Baryon Acoustic Oscillations data to the predictions of a cosmological model of interacting dark matter and dark energy. This theoretical model can be derived from the effective field theory of Einstein–Cartan gravity with two ...
Damien Bégué, Clément Stahl, She-Sheng Xue   +2 more
doaj   +1 more source

Model-independent Calibration for Sound Horizon: Combining Observations of Supernovae and Baryon Acoustic Oscillation Measurements

The Astrophysical Journal
The sound horizon scale is a key theoretical prediction of the cosmological model that depends on the speed of sound in the baryon-photon fluid and the rate of expansion of the early Universe, before matter and radiation decoupled.
Tonghua Liu, Xinyi Zhong, Marek Biesiada, Jieci Wang   +3 more
doaj   +1 more source

Analyzing the H0 tension in F(R) gravity models

Nuclear Physics B, 2021
The Hubble constant tension problem is analyzed in the framework of a class of modified gravity, the so-called F(R) gravity. To do so, we explore two models: an exponential and a power-law F(R) gravities, which includes an early dark energy (EDE) term in
Sergei D. Odintsov, Diego Sáez-Chillón Gómez, German S. Sharov   +2 more
doaj   +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

Features of the Acoustic Mechanism of Core-Collapse Supernova Explosions [PDF]

, 2006
In the context of 2D, axisymmetric, multi-group, radiation/hydrodynamic simulations of core-collapse supernovae over the full 180$^{\circ}$ domain, we present an exploration of the progenitor dependence of the acoustic mechanism of explosion.
A. Burrows, C. D. Ott, E. Livne, Foglizzo T., J. Murphy, Janka H.-Th., L. Dessart, Moiseenko S. G.   +7 more
core   +2 more sources

Dynamical Dark Energy in the Crosshairs: A Joint Analysis with DESI, Type Ia Supernovae, and TDCOSMO Constraints

The Astrophysical Journal
In this work, we perform a comprehensive joint analysis of three representative dark energy models—ΛCDM, the Chevallier–Polarski–Linder (CPL) parameterization, and the Generalized Emergent Dark Energy (GEDE) model—using the latest observational data sets:
Tonghua Liu, Xiaolei Li, Jieci Wang
doaj   +1 more source