Results 41 to 50 of about 3,248,739 (364)
Reionization and Cosmology with 21 cm Fluctuations [PDF]
, 2009 Measurement of the spatial distribution of neutral hydrogen via the redshifted 21 cm line promises to revolutionize our knowledge of the epoch of reionization and the first galaxies, and may provide a powerful new tool for observational cosmology from ...
J. Stuart B. Wyithe +4 more
core +1 more source
New observational constraints on f(T) cosmology from radio quasars [PDF]
, 2017 Using a new recently compiled milliarcsecond compact radio data set of 120 intermediate-luminosity quasars in the redshift range $$0.46< z
Jingzhao Qi +4 more
semanticscholar +1 more source
Neural network reconstruction of late-time cosmology and null tests [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 The prospect of nonparametric reconstructions of cosmological parameters from observational data sets has been a popular topic in the literature for a number of years.
K. Dialektopoulos +4 more
semanticscholar +1 more source
Observational constraints on undulant cosmologies [PDF]
Journal of Cosmology and Astroparticle Physics, 2006 19 pages, 12 figures in 19 files, uses iopart.cls, iopart10.clo; added ...
Barenboim, Gabriela +2 more
openaire +5 more sources
Space and observers in cosmology [PDF]
Astronomy & Astrophysics, 2001 I provide a prescription to define space, at a given moment, for an arbitrary observer in an arbitrary (sufficiently regular) curved space-time. This prescription, based on synchronicity (simultaneity) arguments, defines a foliation of space-time, which corresponds to a family of canonically associated observers.
openaire +3 more sources
Observational aspects of an inhomogeneous cosmology [PDF]
Proceedings of VIII International Workshop on the Dark Side of the Universe — PoS(DSU 2012), 2013 One of the biggest mysteries in cosmology is Dark Energy, which is required to explain the accelerated expansion of the universe within the standard model. But maybe one can explain the observations without introducing new physics, by simply taking one step back and re-examining one of the basic concepts of cosmology, homogeneity. In standard cosmology,
Christoph Saulder +2 more
openaire +4 more sources
Temporal and Spectral Variability of OJ 287 before the April–June 2020 Outburst
Galaxies, 2020 We present the results of a temporal and spectral study of the BL Lacertae object OJ 287 in optical, UV, and X-ray bands with observations performed by Swift satellite during September 2019–March 2020.
Nibedita Kalita +2 more
doaj +1 more source
Highly Accreting Supermassive Black Holes as Eddington Standard Candles
Physical Sciences Forum, 2023 Supermassive black holes accreting matter at very high, perhaps even super-Eddington rates appear in the sky as a special class of luminous active galactic nuclei.
Paola Marziani
doaj +1 more source
Inflationary spectra and observations in loop quantum cosmology [PDF]
J. Phys.: Conf. Ser. 360 (2012) 012027, 2011 We review some recent progress in the extraction of inflationary observables in loop quantum cosmology. Inverse-volume quantum corrections induce a growth of power in the large-scale cosmological spectra and are constrained by observations.
arxiv +1 more source
Dark Matter and Galaxy Formation: Challenges for the Next Decade [PDF]
, 2004 The origin of the galaxies represents an important focus of current cosmological research, both observational and theoretical. Its resolution involves a comprehensive understanding of star formation, galaxy dynamics, the cosmology of the very early ...
Silk, Joseph
core +3 more sources