Results 21 to 30 of about 17,761 (262)

KiDS-1000 Cosmology: Constraints beyond flat ΛCDM [PDF]

Astronomy & Astrophysics, 2021
We present constraints on extensions to the standard cosmological model of a spatially flat Universe governed by general relativity, a cosmological constant (Λ), and cold dark matter (CDM) by varying the spatial curvature ΩK, the sum of the neutrino masses ∑mν, the dark energy equation of state parameter w, and the Hu-Sawicki f(R) gravity fR0 parameter.
Tilman Tröster, Marika Asgari, Chris Blake, Matteo Cataneo, Catherine Heymans, Hendrik Hildebrandt, Benjamin Joachimi, Chieh-An Lin, Ariel G. Sánchez, Angus H. Wright, Maciej Bilicki, Benjamin Bose, Martin Crocce, Andrej Dvornik, Thomas Erben, Benjamin Giblin, Karl Glazebrook, Henk Hoekstra, Shahab Joudaki, Arun Kannawadi, Fabian Köhlinger, Konrad Kuijken, Chris Lidman, Lucas Lombriser, Alexander Mead, David Parkinson, HuanYuan Shan, Christian Wolf, Qianli Xia   +28 more
openaire   +7 more sources

Localized surface plasmon resonance in silver nanoparticles——sensing,molecular recognition and light-matter interaction enhancement

上海师范大学学报. 自然科学版, 2015
By assuming the cosmological “constant” is no longer a constant during the inflation epoch,it is found that the cosmological constant fine-tuning problem is solved.In the meanwhile,inflation models could predict a large tensor-to-scalar ratio,correct ...
CHEN Luyi, ZHAO Xiaojing, HAO Yinghua, LIU Feng   +3 more
doaj   +1 more source

Inflation and the cosmological constant

上海师范大学学报. 自然科学版, 2014
By assuming the cosmological “constant” is no longer a constant during the inflation epoch,it is found that the cosmological constant fine-tuning problem is solved.In the meanwhile,inflation models could predict a large tensor-to-scalar ratio,correct ...
FENG Chaojun, LI Xinzhou
doaj   +1 more source

Brane World Cosmologies with Varying Speed of Light [PDF]

, 2001
We study cosmologies in the Randall-Sundrum models, incorporating the possibility of time-varying speed of light and Newton's constant. The cosmologies with varying speed of light (VSL) were proposed by Moffat and by Albrecht and Magueijo as an ...
A. Albrecht, A. Albrecht, A. Balbi, A. D. Linde, A. H. Guth, C. Csaki, C. Csaki, D. Ida, D. J. Chung, Donam Youm, E. E. Flanagan, E. Kiritsis, G. Kalbermann, H. Ishihara, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. D. Bekenstein, J. K. Webb, J. Lykken, J. M. Cline, J. M. Cline, J. Magueijo, J. W. Moffat, L. Randall, L. Randall, M. A. Clayton, M. A. Clayton, N. Arkani-Hamed, P. Binetruy, P. Binetruy, P. de Bernardis, P. P. Avelino, S. H. Alexander, S. Hanany, S. Kachru, S. Mukohyama, S. Mukohyama, S. S. Stepanov, W. D. Goldberger, W. D. Goldberger, W. D. Goldberger   +42 more
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The Implementation, Interpretation, and Justification of Likelihoods in Cosmology [PDF]

, 2017
I discuss the formal implementation, interpretation, and justification of likelihood attributions in cosmology. I show that likelihood arguments in cosmology suffer from significant conceptual and formal problems that undermine their applicability in ...
Albert, Arms, Asselmeyer-Maluga, Beem, Beisbart, Beisbart, Bombelli, Butterfield, Butterfield, C.D. McCoy, Callender, Cornish, Cornish, Coule, Coule, Davidson, Demarest, Dingle, Donaldson, Earman, Earman, Earman, Earman, Earman, Ellis, Ellis, Ellis, Ellis, Ellis, Ellis, Evrard, Fischer, Fletcher, Freedman, Frigg, Frigg, Geroch, Gibbons, Gibbons, Harré, Hawking, Hawking, Hawking, Henneuax, Hollands, Isenberg, Kirchner, Lachièze-Rey, Laudan, Lebowitz, Lebowitz, Lerner, Loewer, Loewer, Luminet, Magnus, Manchak, Manchak, Maudlin, McCabe, McCoy, McCoy, McMullin, Munitz, North, Norton, Norton, Penrose, Penrose, Price, Schiffrin, Shackel, Smeenk, Sładkowski, Wald, Wallace, Wallace, Wolf   +77 more
core   +5 more sources

Geometrodynamics of Variable-Speed-of-Light Cosmologies [PDF]

, 2000
This paper is dedicated to the memory of Dennis Sciama. Variable-Speed-of-Light (VSL) cosmologies are currently attracting interest as an alternative to inflation.
A. Albrecht, A. E. Everett, A. E. Everett, A. Guth, A. H. Guth, A. Yates, B. A. Bassett, B. A. Bassett, B. Nodland, Bruce A. Bassett, C.-P. Ma, Carmen Molina-París, D. Colladay, D. Colladay, D. H. Coule, D. Kramer, E. Kiritsis, E. W. Kolb, E. Yablonovitch, F. Belgiorno, G. Amelino-Camelia, G. Barton, G. Barton, G. F. R. Ellis, G. Huey, G. M. Shore, H. B. Nielsen, H. B. Nielsen, H. van Elst, I. T. Drummond, J. C. D’Olivo, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. Ellis, J. F. Nieves, J. K. Webb, J. Lesgourgues, J. Levin, J. Levin, J. Robinson, J. W. Moffat, J. W. Moffat, K. Scharnhorst, K. Subramanian, L. Kofman, M. A. Clayton, M. A. Clayton, M. J. Drinkwater, M. Novello, M. Visser, M. Visser, M. Visser, Matt Visser, N. J. Turok, N. J. Turok, P. Jain, P. P. Avelino, P. Schnieder, R. Bluhm, R. Bluhm, R. D. Daniels, R. D. Daniels, R. D. Peccei, R. R. Caldwell, S. Carlip, S. Chadha, S. Coleman, S. Coleman, S. Liberati, S. M. Carroll, S. M. Carroll, S. M. Carroll, S. M. Carroll, Stefano Liberati, T. Damour, T. Jacobson, T. Jacobson, W. Dittrich, W. G. Unruh, W. G. Unruh, W. H. Zurek, Y. Hu, Y. Shtanov, Y. Su   +84 more
core   +2 more sources

Spatially flat quantum cosmology [PDF]

Classical and Quantum Gravity, 1991
The authors investigate the quantum cosmology of spatially locally homogeneous cosmological models with flat compact spatial surfaces in three and four spacetime dimensions. In (2+1) dimensions the only possible spatial surfaces are the 2-torus and the Klein bottle, whereas in (3+1) dimensions there are ten possible spatial surfaces.
J Louko, P J Ruback
openaire   +1 more source

CORRESPONDENCE BETWEEN DGP BRANE COSMOLOGY AND 5D RICCI-FLAT COSMOLOGY [PDF]

Modern Physics Letters A, 2008
We discuss the correspondence between the DGP brane cosmology and 5D Ricci-flat cosmology by letting their metrics equal each other. By this correspondence, a specific geometrical property of the arbitrary integral constant I in DGP metric is given and it is related to the curvature of 5D bulk.
Ping, Yongli, Xu, Lixin, Liu, Hongya
openaire   +2 more sources

Kinematic Cosmology in Conformally Flat Spacetime [PDF]

The Astrophysical Journal, 1998
In a recent series of papers Endean examines the properties of spatially homogeneous and isotropic (FLRW) cosmological models filled with dust in the ``conformally flat spacetime presentation of cosmology'' (CFS cosmology). This author claims it is possible to resolve a certain number of the difficulties the standard model exhibits when confronted to ...
openaire   +2 more sources

Flat Cosmology with Coupled Matter and Dark Energy [PDF]

The Astronomical Journal, 2007
Version to appear in The Astronomical Journal, with a modified name- Flat Cosmology with Coupled Matter and Dark Energies.
Abdel-Rahman, A. -M. M., Riad, Ihab F.
openaire   +2 more sources