Results 91 to 100 of about 385,645 (329)

Black hole shadow with a cosmological constant for cosmological observers

European Physical Journal C: Particles and Fields, 2019
We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological constant changes the angular size of the black hole shadow for static ...
Javad T. Firouzjaee, Alireza Allahyari
doaj   +1 more source

Global Vortex and Black Cosmic String

, 1997
We study global vortices coupled to (2+1) dimensional gravity with negative cosmological constant. We found nonsingular vortex solutions in $\phi^4$-theory with a broken U(1) symmetry, of which the spacetimes do not involve physical curvature singularity.
A. Staruszkiewicz, A. Vilenkin, A. Vilenkin, C. Farina, C. Kim, D. Cangemi, D. Harari, D. Harari, E. P. S. Shellard, E. Witten, G. Clement, G. W. Gibbons, J. D. Brown, J. Gott, J. Hong, J. S. F. Chan, K. Lee, K. Maeda, Kyoungtae Kimm, M. B. Hindmarsh, M. Bañados, M. Bañados, N. Kaloper, Nakwoo Kim, P. Breitenlohner, P. Valtancoli, R. A. Leese, R. Gregory, R. Jackiw, R. L. Davis, R. M. Burnett, S. Deser, S. Deser, Y. Kim, Y. Kim, Yoonbai Kim   +35 more
core   +1 more source

Superstring cosmology [PDF]

Physics Reports, 2000
Aspects of superstring cosmology are reviewed with an emphasis on the cosmological implications of duality symmetries in the theory. The string effective actions are summarized and toroidal compactification to four dimensions reviewed. Global symmetries that arise in the compactification are discussed and the duality relationships between the string ...
Lidsey, James E., Wands, David, Copeland, E. J.   +2 more
openaire   +2 more sources

Spiritual Cannibalism in HRD: How Workplace Spirituality Devours Sacred Traditions

Human Resource Development Quarterly, EarlyView.
ABSTRACT This paper interrogates how the discourse of workplace spirituality in human resource development (HRD) operates as a tool of colonization. Through a systematic review of 48 articles published between 1997 and March 2025, the study uncovers recurring patterns of spiritual appropriation in which non‐Western traditions are detached from their ...
Shoaib Ul‐Haq
wiley   +1 more source

Quasars: Standard Candles up to z = 7.5 with the Precision of Supernovae Ia

The Astrophysical Journal, 2023
Currently, the Λ cold dark matter model, which relies on the existence of cold dark matter and a cosmological constant Λ, best describes the universe. However, we lack information in the high-redshift ( z ) region between Type Ia supernovae (SNe Ia; up ...
M. G. Dainotti, G. Bargiacchi, A. Ł. Lenart, S. Nagataki, S. Capozziello   +4 more
doaj   +1 more source

Cosmological constant, violation of cosmological isotropy and CMB

, 2009
We suggest that the solution to the cosmological vacuum energy puzzle does not require any new field beyond the standard model, but rather can be explained as a result of the interaction of the infrared sector of the effective theory of gravity with ...
, A.A. Starobinsky, Ariel R Zhitnitsky, C.J. Copi, E.C. Thomas, F.K. Hansen, F.R. Klinkhamer, F.R. Urban, F.R. Urban, Federico R Urban, J. Bjorken, J.D. Bjorken, N.J. Cornish, Supernova Cosmology Project collaboration, Supernova Search Team collaboration, WMAP collaboration, Y.B. Zeldovich, Y.B. Zeldovich   +17 more
core   +1 more source

Scaling Cosmology [PDF]

General Relativity and Gravitation, 2003
We show that with the help of a suitable coupling between dark energy and cold dark matter it is possible to reproduce any scaling solution $ _{X}\propto _{M}a^ $, where $ _{X}$ and $ _{M}$ are the densities of dark energy and dark matter, respectively. We demonstrate how the case $ = 1$ alleviates the coincidence problem. Future observations of
Zimdahl, Winfried, Pavón, Diego
openaire   +3 more sources

“Not a Single Leaf Is Meant to be Taken With You”: Conservation Motivations and Belief Systems in a Khasi Sacred Landscape of Meghalaya, India “一片叶子都不许带走”:印度梅加拉亚邦卡西族神圣景观中的保护动机与信仰体系

Integrative Conservation, EarlyView.
This study examines the Mawphlang Sacred Forest in Meghalaya as a culturally embedded model of community‐led conservation. Drawing on qualitative fieldwork, it highlights how spiritual reverence, sacred taboos, and ancestral authority shape ecological stewardship, complementing formal governance systems.
Mrinal Saikia
wiley   +1 more source

Cosmological distance indicators

, 2018
We review three distance measurement techniques beyond the local universe: (1) gravitational lens time delays, (2) baryon acoustic oscillation (BAO), and (3) HI intensity mapping.
A. Agnello, A. Eigenbrod, A. Goobar, A. Hojjati, A. Hojjati, A. More, A. Oscoz, A.G. Riess, A.M. Martin, A.S. Tagore, B.J. Brewer, C. Alcock, C. Grillo, C. Hazard, C. McCully, C. Vanderriest, C. Vuissoz, C. Vuissoz, C.D. Fassnacht, C.D. Fassnacht, C.D. Fassnacht, C.E. Rusu, C.L. Bennett, C.S. Kochanek, C.S. Kochanek, C.W. Morgan, D. Paraficz, D. Sluse, D. Walsh, D.A. Goldstein, D.A. Goldstein, D.H. Weinberg, D.J. Eisenstein, D.J. Eisenstein, E. Eulaers, E. Giannini, E. Jullo, E.E. Falco, E.O. Ofek, E.R. Switzer, F. Courbin, F. Courbin, F. Courbin, F.B. Abdalla, G. Dobler, G. Dobler, G. Efstathiou, G. Golse, G.C.F. Chen, H. Lin, H.J. Seo, H.J. Seo, I. Burud, I. Burud, I. Burud, I. Jee, I. Momcheva, J. Fohlmeister, J. Fohlmeister, J. Hjorth, J. Huchra, J. Lehar, J.R. Shaw, J.R. Shaw, J.W. Nightingale, K. Bandura, K. Liao, K.C. Wong, K.S. Dawson, K.W. Masui, K.W. Masui, L. Amendola, L. Anderson, L. Oldham, L.B. Newburgh, L.J. Hainline, L.L.R. Williams, L.V.E. Koopmans, L.V.E. Koopmans, L.V.E. Koopmans, L.V.E. Koopmans, M. Barnabè, M. Barnabè, M. Cappellari, M. Jauzac, M. Oguri, M. Oguri, M. Oguri, M. Schmidt, M. Sereno, M. Takada, M. Tegmark, M. Tegmark, M. Tewes, M. Tewes, M.A. Zwaan, M.J. Drinkwater, N. Cantale, N. Kaiser, N.A. Grogin, O. Wucknitz, P. Bull, P. Jakobsson, P. Magain, P. Magain, P. Saha, P. Schneider, P. Schneider, P. Schneider, P. Schneider, P. Young, P.A.R. Ade, P.J. Marshall, P.J.E. Peebles, P.L. Kelly, P.L. Kelly, P.L. Kelly, P.L. Schechter, R. Adam, R. Barkana, R. Blandford, R. Blandford, R. Fadely, R. Gavazzi, R. Kawamata, R. Kormann, R.B. Wayth, S. Birrer, S. Cole, S. Dye, S. Hilbert, S. Rathna Kumar, S. Rathna Kumar, S. Refsdal, S. Vegetti, S. Wallington, S. Wyithe, S.A. Rodney, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.H. Suyu, S.J. Warren, S.S. Tie, T. Kundić, T. Matsubara, T. Okumura, T. Okumura, T. Treu, T.C. Chang, T.C. Chang, T.E. Collett, V. Bonvin, V. Bonvin, V.N. Shalyapin, W. Hu, W.L. Freedman, W.N. Colley, X. Fernández, Y. Xu, Y.W. Liao, Z.S. Greene, É. Aubourg   +166 more
core   +1 more source

Massive cosmologies

Physical Review D, 2011
We explore the cosmological solutions of a recently proposed extension of General Relativity with a Lorentz-invariant mass term. We show that the same constraint that removes the Boulware-Deser ghost in this theory also prohibits the existence of homogeneous and isotropic cosmological solutions.
D'Amico, G., De Rham, C., Dubovsky, S., Gabadadze, G., Pirtskhalava, D., Tolley, A. J.   +5 more
openaire   +4 more sources