Results 71 to 80 of about 12,766 (215)
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 +2 more
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Unknowns and unknown unknowns: from dark sky to dark matter and dark energy
, 2010 Answering well-known fundamental questions is usually regarded as the major goal of science. Discovery of other unknown and fundamental questions is, however, even more important.
Suto, Yasushi
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Assessing observational constraints on dark energy
Physics Letters BObservational 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
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Cosmology with mirror dark matter II: Cosmic Microwave Background and Large Scale Structure
, 2004 This is the second paper of a series devoted to the study of the cosmological implications of the existence of mirror dark matter. The parallel hidden mirror world has the same microphysics as the observable one and couples the latter only ...
Berezhiani Z. +3 more
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The Astrophysical Journal LettersDetermining 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 +4 more
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European Physical Journal C: Particles and FieldsThe 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 +2 more
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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 +3 more
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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
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Cosmic void baryon acoustic oscillation measurement: Evaluation of sensitivity to selection effects [PDF]
, 2022 D. Forero-Sánchez +7 more
openalex +1 more source
Monopole Fluctuations in Galaxy Surveys
The Astrophysical Journal LettersGalaxy clustering provides a powerful way to probe cosmology. This requires understanding of the background mean density of galaxy samples, which is estimated from the survey itself by averaging the observed galaxy number density over the angular ...
Jaiyul Yoo, Daniel Eisenstein
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