Results 101 to 110 of about 13,060 (254)

The alignment of galaxies at the Baryon Acoustic Oscillation scale

The Open Journal of Astrophysics, 2023
Massive elliptical galaxies align pointing their major axis towards each other in the structure of the Universe. Such alignments are well-described at large scales through a linear relation with respect to the tidal field of the large-scale structure. At
Dennis van Dompseler, Christos Georgiou, Nora Elisa Chisari   +2 more
doaj   +1 more source

Cosmological constraints on Neutrino - Dark Matter interactions

, 2006
I summarize the results of a recent analysis where the cosmological effects of interactions of neutrinos with cold Dark Matter (DM) is investigated. This interaction produces diffusion-damped oscillations in the matter power spectrum, analogous to the ...
Boehm, G. Mangano, Mangano, Schaeffer, Serpico, Tegmark   +5 more
core   +2 more sources

Probing a Steep EoS for Dark Energy with latest observations

, 2017
We present a parametrization for the Dark Energy Equation of State "EoS" which has a rich structure, performing a transition at pivotal redshift $z_T$ between the present day value $w_0$ to an early time $w_i=w_a+w_0\equiv w(z\gg0)$ with a steepness ...
de la Macorra, Axel, Jaber, Mariana
core   +1 more source

Isobaric Reconstruction of the Baryonic Acoustic Oscillation [PDF]

The Astrophysical Journal Letters, 2017
Abstract In this Letter, we report a significant recovery of the linear baryonic acoustic oscillation (BAO) signature by applying the isobaric reconstruction algorithm to the nonlinear matter density field. Assuming only the longitudinal component of the displacement being cosmologically relevant, this algorithm iteratively solves the ...
Xin Wang, Hao-Ran Yu, Hong-Ming Zhu, Yu Yu, Qiaoyin Pan, Ue-Li Pen   +5 more
openaire   +2 more sources

Assessing observational constraints on dark energy

Physics Letters B
Observational constraints on time-varying dark energy (e.g., quintessence) are commonly presented on a w0-wa plot that assumes the equation of state of dark energy strictly satisfies w(z)=w0+waz/(1+z) as a function of the redshift z.
David Shlivko, Paul J. Steinhardt
doaj   +1 more source

Predictions for BAO distance estimates from the cross-correlation of the Lyman-alpha forest and redshifted 21-cm emission

, 2013
We investigate the possibility of using the cross-correlation of the Lyman-alpha forest and redshifted 21-cm emission to detect the baryon acoustic oscillation (BAO).
Bharadwaj, Somnath, Sarkar, Tapomoy Guha
core   +1 more source

Newest Measurements of Cosmic Curvature with BOSS/eBOSS and DESI DR1 Baryon Acoustic Oscillation Observations

The Astrophysical Journal Letters
Determining the cosmic curvature (Ω _K ) independent of cosmological models plays a key role in revealing the background physics of our Universe. In this Letter, we propose an improved method to measure the cosmic curvature using the observations of ...
Tonghua Liu, Shengjia Wang, Hengyu Wu, Shuo Cao, Jieci Wang   +4 more
doaj   +1 more source

Cosmological extrapolation of MOND

, 2011
Regime of MOND, which is used in astronomy to describe the gravitating systems of island type without the need to postulate the existence of a hypothetical dark matter, is generalized to the case of homogeneous distribution of usual matter by introducing
Amanullah R, Bond J R, Chang Z Li M H Li X, Eisenstein D J, Hu W, Komatsu E, McGaugh S, McGaugh S, Milgrom M, Milgrom M, Milgrom M, Moffat J W, Moffat J W, Moffat J W Toth V T, Nakamura K, Riess A G, Riess A G, S A Timofeev, V V Kiselev, Verlinde E P, Visser M, Wood-Vasey W M   +21 more
core   +1 more source

Observational constraints for cubic gravity theory based on third order contractions of the Riemann tensor

European Physical Journal C: Particles and Fields
The paper studies different observational features in the case of a specific cubic gravity theory, based on third order contractions of the Riemann tensor.
Mihai Marciu, Dana Maria Ioan, Mihai Dragomir   +2 more
doaj   +1 more source

Low-redshift constraints on the Hubble constant from the baryon acoustic oscillation “standard rulers” and the gravitational wave “standard sirens”

European Physical Journal C: Particles and Fields, 2019
The multi-messenger observations of GW170817 indicated a new independent measurement of the Hubble constant ($$H_0$$ H0 ). We obtain the low-redshift cosmological constraints on $$H_0$$ H0 by combining this gravitational wave measurement with the ...
Zhe Chang, Qing-Guo Huang, Sai Wang, Zhi-Chao Zhao   +3 more
doaj   +1 more source