Results 31 to 40 of about 90,199 (336)

Average observational quantities in the timescape cosmology [PDF]

, 2009
We examine the properties of a recently proposed observationally viable alternative to homogeneous cosmology with smooth dark energy, the timescape cosmology.
A. Gabrielli, A. Shafieloo, D. L. Wiltshire, David L. Wiltshire, G. C. McVittie, G. F. R. Ellis, M. N. Célérier, M. N. Célérier, S. Räsänen, T. Buchert   +9 more
core   +3 more sources

Limitations of Observational Cosmology [PDF]

International Astronomical Union Colloquium, 1990
AbstractUnlike the usual situation with theoretical physics which is testable in the laboratory, in cosmological theories of the universe one faces the following problems: The observer is part of the system, the universe, and this system cannot be altered to test physical theory.
openaire   +2 more sources

“Observables” in causal set cosmology [PDF]

Physical Review D, 2003
LaTeX, 1+19 pages, 2 ...
R. S. Garcia, Rafael D. Sorkin, Joe Henson, Graham Brightwell, H. Fay Dowker   +4 more
openaire   +3 more sources

Observational cosmology using characteristic numerical relativity

, 2010
The characteristic formalism in numerical relativity, which has been developed to study gravitational waves, and the observer metric approach in observational cosmology both make use of coordinate systems based on null cones.
Bishop, N. T., van der Walt, P. J.
core   +1 more source

The Structure and Interpretation of Cosmology: Part I - General Relativistic Cosmology

, 2004
The purpose of this work is to review, clarify, and critically analyse modern mathematical cosmology. The emphasis is upon mathematical objects and structures, rather than numerical computations. This paper concentrates on general relativistic cosmology.
Arp, Beem, Besse, Blau, Boothby, Clark, Coles, Cornish, Dubrovin, Ellis, Friedman, Fulton, Gordon McCabe, Heller, Karttunen, Kolb, Layzer, Nicolson, O'Neill, Sachs, Scott, Sneed, Suppe, Suppes, Wolf   +24 more
core   +2 more sources

Cross-correlating Dark Sirens and Galaxies: Constraints on H 0 from GWTC-3 of LIGO–Virgo–KAGRA

The Astrophysical Journal
We apply the cross-correlation technique to infer the Hubble constant ( H _0 ) of the Universe using gravitational-wave (GW) sources without electromagnetic counterparts (dark sirens) from the third GW Transient Catalog (GWTC-3) and the photometric ...
Suvodip Mukherjee, Alex Krolewski, Benjamin D. Wandelt, Joseph Silk   +3 more
doaj   +1 more source

Generalized holographic cosmology: low-redshift observational constraint

Journal of High Energy Physics, 2021
Four-dimensional cosmological models are studied on a boundary of a five-dimensional Anti-de Sitter (AdS 5) black hole with AdS Reissner-Nordström and scalar charged Reissner-Nordström black hole solutions, where we call the former a “Hairless” black ...
Sunly Khimphun, Bum-Hoon Lee, Gansukh Tumurtushaa   +2 more
doaj   +1 more source

Statefinder diagnostic for cosmology with the abnormally weighting energy hypothesis

, 2007
In this paper, we apply the statefinder diagnostic to the cosmology with the Abnormally Weighting Energy hypothesis (AWE cosmology), in which dark energy in the observational (ordinary matter) frame results from the violation of weak equivalence ...
A. Füzfa, A. Füzfa, B. Chang, B. Chang, C. Deffayet, Dao-jun Liu, E. J. Copeland, G. Dvali, H. Wei, M. R. Setare, S. Weinberg, S. M. Carroll, T. Chiba, T. Padmanabhan, U. Alam, V. Sahni, V. Sahni, V. Sahni, W. Zimdahl, Wei-zhong Liu, X. Zhang, X. Zhang, Z.-L. Yi   +22 more
core   +1 more source

Is Computing with Light All You Need? A Perspective on Codesign for Optical Artificial Intelligence and Scientific Computing

Advanced Intelligent Systems, EarlyView.
This perspective article considers what computations optical computing can and should enable. Focusing upon free‐space optical computing, it argues that a codesign approach whereby materials, devices, architectures, and algorithms are simultaneously optimized is needed.
Prasad P. Iyer, Gaurang R. Bhatt, Saaketh Desai, Elliot J. Fuller, Corinne M. Teeter, François Léonard, Craig M. Vineyard   +6 more
wiley   +1 more source

Observational constraints on Horava-Lifshitz cosmology

, 2009
We use observational data from Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO), and Cosmic Microwave Background (CMB), along with requirements of Big Bang Nucleosynthesis (BBN), to constrain the cosmological scenarios governed by Horava ...
A. Castillo, A. Ghodsi, A. Ghodsi, A. Papazoglou, A. Wang, A. Wang, A. Wang, B. Chen, B. Chen, B. Chen, C. Appignani, C. Bogdanos, C. Charmousis, C. Clarkson, C. Germani, C. Pallis, C.G. Boehmer, C.M. Will, D. Blas, D. Capasso, D. Momeni, D. Orlando, D.J. Eisenstein, E. Kiritsis, E.L. Wright, E.N. Saridakis, E.O. Colgain, Emmanuel N Saridakis, F.-W. Shu, G. Barenboim, G. Calcagni, G. Leon, H. Nastase, H.W. Lee, I. Cho, J. Alexandre, J. Chen, J. Kluson, J. Kluson, J.M. Virey, K. Ichikawa, K. Ichikawa, K. Koyama, L. Iorio, L. Iorio, M. Botta-Cantcheff, M. Li, M. Minamitsuji, M.-I. Park, M.-I. Park, M.-I. Park, M.-I. Park, M.R. Setare, N. Varghese, P. Hořava, P. Hořava, P. Wu, R. Lazkoz, R.-G. Cai, R.-G. Cai, R.B. Mann, S. Carloni, S. Koh, S. Mukohyama, Sourish Dutta, Supernova Cosmology Project collaboration, T. Harko, T. Kobayashi, T. Nishioka, T. Suyama, T.P. Sotiriou, U.H. Danielsson, W. Hu, W.J. Percival ., WMAP collaboration, X. Gao, X. Gao, Y. Wang, Y.-F. Cai, Y.S. Myung, Y.S. Myung   +80 more
core   +1 more source