Results 71 to 80 of about 492,367 (339)

Light trajectory and shadow shape in the rotating naked singularity

European Physical Journal C: Particles and Fields, 2022
In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is derived using the Newman–Janis algorithm without complexification method.
Vishva Patel, Divya Tahelyani, Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi   +4 more
doaj   +1 more source

Cosmological Entanglement

International Journal of Theoretical Physics, 2010
We investigate the connection between the entanglement generated by expanding universe and the cosmological parameters. We show that the faster the universe expands and the larger the total volume results the higher degree of entanglement.
Moradi, Shahpoor, Rasouli, Mosleh
openaire   +3 more sources

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

The Dark Energy Survey: Cosmology Results with ∼1500 New High-redshift Type Ia Supernovae Using the Full 5 yr Data Set

Astrophysical Journal Letters
We present cosmological constraints from the sample of Type Ia supernovae (SNe Ia) discovered and measured during the full 5 yr of the Dark Energy Survey (DES) SN program.
D. C. T. Abbott, M. Acevedo, M. Aguena, A. Alarcon, S. Allam, O. Alves, A. Amon, F. Andrade-Oliveira, J. Annis, P. Armstrong, J. Asorey, S. Ávila, D. Bacon, B. Bassett, K. Bechtol, P. Bernardinelli, G. Bernstein, E. Bertin, J. Blazek, S. Bocquet, D. Brooks, D. Brout, E. Buckley-Geer, D. Burke, H. Camacho, R. Camilleri, A. Campos, A. Carnero Rosell, D. Carollo, A. Carr, J. Carretero, F. Castander, R. Cawthon, C. Chang, R. Chen, A. Choi, C. Conselice, M. Costanzi, L. D. da Costa, M. Crocce, T. Davis, D. DePoy, S. Desai, H. Diehl, M. Dixon, S. Dodelson, P. Doel, C. Doux, A. Drlica-Wagner, J. Elvin-Poole, S. Everett, I. Ferrero, A. Ferté, B. Flaugher, R. Foley, P. Fosalba, D. Friedel, J. Frieman, C. Frohmaier, L. Galbany, J. García-Bellido, M. Gatti, E. Gaztañaga, G. Giannini, K. Glazebrook, O. Graur, D. Gruen, R. Gruendl, G. Gutiérrez, W. Hartley, K. Herner, S. Hinton, D. Hollowood, K. Honscheid, D. Huterer, B. Jain, D. James, N. Jeffrey, E. Kasai, L. Kelsey, S. Kent, R. Kessler, A. Kim, R. P. Kirshner, E. Kovacs, K. Kuehn, O. Lahav, J. Lee, S. Lee, G. Lewis, T. Li, C. Lidman, H. Lin, U. Malik, J. Marshall, P. Martini, J. Mena-Fernández, F. Menanteau, R. Miquel, J. Mohr, J. Mould, J. Muir, A. Möller, E. Neilsen, R. Nichol, P. Nugent, R. Ogando, A. Palmese, Y.-C. Pan, M. Paterno, W. Percival, M. Pereira, A. Pieres, A. P. Plazas Malagón, B. Popovic, A. Porredon, J. Prat, H. Qu, M. Raveri, M. Rodriguez-Monroy, A. Romer, A. Roodman, B. Rose, M. Sako, E. Sanchez, D. Sanchez Cid, M. Schubnell, D. Scolnic, I. Sevilla-Noarbe, P. Shah, J. A. Smith, M. Smith, M. Soares-Santos, E. Suchyta, M. Sullivan, N. Suntzeff, M. Swanson, B. Sánchez, G. Tarlé, G. Taylor, D. Thomas, C. To, M. Toy, M. Troxel, B. E. Tucker, D. Tucker, S. Uddin, M. Vincenzi, A. Walker, N. Weaverdyck, R. H. Wechsler, J. Weller, W. Wester, P. Wiseman, M. Yamamoto, F. Yuan, B. Zhang, Y. Zhang   +157 more
semanticscholar   +1 more source

Quantum cosmology

Zeitschrift für Naturforschung A, 2022
AbstractWe give an introduction into quantum cosmology with emphasis on its conceptual parts. After a general motivation, we review the formalism of canonical quantum gravity on which discussions of quantum cosmology are usually based. We then present the minisuperspace Wheeler–DeWitt equation and elaborate on the problem of time, the imposition of ...
Kiefer, Claus, Sandhoefer, Barbara
openaire   +2 more sources

Linear Image Regridding and Coaddition with Oversampled Point Spread Functions: Lessons from 1D

The Astronomical Journal
Image regridding and coaddition have a wide range of applications in astronomical observations. Image Combination (I mcom) , an algorithm that provides control over point-spread function (PSF) and noise in coadded images, has been found to meet the ...
Kaili Cao, Roman HLIS Cosmology PIT
doaj   +1 more source

Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests [PDF]

, 2012
We review different dark energy cosmologies. In particular, we present the ΛCDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type I, II, III and IV finite-time future singularities and non-singular dark ...
K. Bamba, S. Capozziello, S. Nojiri, S. Odintsov   +3 more
semanticscholar   +1 more source

Dynamical systems applied to cosmology: Dark energy and modified gravity [PDF]

Physics reports, 2017
The Nobel Prize winning confirmation in 1998 of the accelerated expansion of our Universe put into sharp focus the need of a consistent theoretical model to explain the origin of this acceleration.
S. Bahamonde, C. Boehmer, S. Carloni, E. Copeland, W. Fang, Nicola Tamanini   +5 more
semanticscholar   +1 more source

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

Equivalence of Models in Loop Quantum Cosmology and Group Field Theory

Universe, 2019
The paradigmatic models often used to highlight cosmological features of loop quantum gravity and group field theory are shown to be equivalent, in the sense that they are different realizations of the same model given by harmonic cosmology.
Bekir Baytaş, Martin Bojowald, Sean Crowe   +2 more
doaj   +1 more source