Results 61 to 70 of about 12,766 (215)

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

Scale-Dependent Bias of Galaxies from Baryonic Acoustic Oscillations [PDF]

, 2010
Baryonic acoustic oscillations (BAOs) modulate the density ratio of baryons to dark matter across large regions of the Universe. We show that the associated variation in the mass-to-light ratio of galaxies should generate an oscillatory, scale-dependent ...
Abraham Loeb, Bertone, Cole, Coles, Eisenstein, Kaiser, Kennicutt, Komatsu, Lahav, Lewis, Mo, Mo, Naoz, Naoz, Rennan Barkana, Schaye, Sheth, Somogyi, Tegmark   +18 more
core   +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

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

Primordial features from linear to nonlinear scales

Physical Review Research, 2019
Sharp features in the primordial power spectrum are a powerful window into the inflationary epoch. To date, the cosmic microwave background (CMB) has offered the most sensitive avenue to search for these signatures.
Florian Beutler, Matteo Biagetti, Daniel Green, Anže Slosar, Benjamin Wallisch   +4 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

Asymmetric Dark Matter and Dark Radiation [PDF]

, 2012
Asymmetric Dark Matter (ADM) models invoke a particle-antiparticle asymmetry, similar to the one observed in the Baryon sector, to account for the Dark Matter (DM) abundance.
A. Lewis, A. Smith ., A.G. Riess ., A.X. Gonzalez-Morales, B. von Harling, B.A. Reid, D. Cadamuro, D. Cadamuro, D. Larson ., E. Aver, E. Aver, E. Nardi, end Paolo Serra, Enrique Fernandez Martinez, G. Mangano, H. Iminniyaz, J. Dunkley ., J. Hamann, J. Hamann, J. Hamann, J. Hamann, J. Hamann, J. March-Russell, J. March-Russell, J.L. Feng, J.L. Feng, Javier Redondo, K. Agashe, K. Petraki, K.M. Nollett, L.J. Hall, M. Cirelli, M.H. Tytgat, Mattias Blennow, Olga Mena, P. Agrawal, Particle Data Group collaboration, Planck collaboration, R. Amanullah ., R. Keisler ., R. Kitano, S. Tulin, T. Banks, V. Page, WMAP collaboration, Y. Cai, Y. Izotov   +46 more
core   +2 more sources

Constraining super-critical string/brane cosmologies with astrophysical data [PDF]

, 2009
We discuss fits of unconventional dark energy models to the available data from high-redshift supernovae, distant galaxies and baryon oscillations. The models are based either on brane cosmologies or on Liouville strings in which a relaxation dark energy
Abdo A A [Fermi LAT, Brax P, Davis T M, Dunkley J [WMAP Collaboration], Eisenstein D J, Ellis J R, Jimenez R, Kolb E W, Kolb E W, Mavromatos N E, Mavromatos N E, Mavromatos N E, Mitsou V A, Riess A G, Vasiliki A Mitsou   +14 more
core   +2 more sources

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., Bjornsson G., Dodelson S., Doroshkevich A. G., Douglas Scott, Elena Pierpaoli, Hawking S. W., Hu W., Martin White, Seager S., Zeldovich Ya. B   +10 more
core   +3 more sources

Testing CCC+TL Cosmology with Observed Baryon Acoustic Oscillation Features

The Astrophysical Journal
The primary purpose of this paper is to see how well a recently proposed new model fits (a) the position of the baryon acoustic oscillation (BAO) features observed in the large-scale distribution of galaxies and (b) the angular size measured for the ...
Rajendra P. Gupta
doaj   +1 more source