Results 31 to 40 of about 748,900 (322)

Hidden Symmetries of Euclideanised Kerr-NUT-(A)dS Metrics in Certain Scaling Limits [PDF]

, 2012
The hidden symmetries of higher dimensional Kerr-NUT-(A)dS metrics are investigated. In certain scaling limits these metrics are related to the Einstein-Sasaki ones.
Vilcu, Gabriel Eduard, Visinescu, Mihai
core   +3 more sources

The Chevreton Tensor and Einstein-Maxwell Spacetimes Conformal to Einstein Spaces [PDF]

, 2007
In this paper we characterize the source-free Einstein-Maxwell spacetimes which have a trace-free Chevreton tensor. We show that this is equivalent to the Chevreton tensor being of pure-radiation type and that it restricts the spacetimes to Petrov types \
Balfagón A, Bel L, Bel L, Bergqvist G, Cahen M, Chevreton M, Collinson C D, Edgar S B, Eriksson I, Göran Bergqvist, Ingemar Eriksson, Merkulov S A, Nurowski P, Penrose R, Penrose R, Senovilla J M M, Senovilla J M M Aldaya V Cerveró J M, Stephani H   +17 more
core   +2 more sources

Sasaki-Einstein and paraSasaki-Einstein metrics from (\kappa,\mu)-structures [PDF]

, 2013
We prove that any non-Sasakian contact metric (\kappa,\mu)-space admits a canonical \eta-Einstein Sasakian or \eta-Einstein paraSasakian metric. An explicit expression for the curvature tensor fields of those metrics is given and we find the values of ...
Alegre, Alekseevsky, Alfonso Carriazo, Baum, Beniamino Cappelletti-Montano, Blair, Blair, Blair, Blair, Boeckx, Bohle, Boyer, Calderbank, Cappelletti-Montano, Cappelletti-Montano, Cappelletti-Montano, Cappelletti-Montano, Cappelletti-Montano, Cappelletti-Montano, Gosh, Ivanov, Kaneyuki, Libermann, Matzeu, Narita, Pang, Perrone, Tanno, Tanno, Tondeur, Vergara-Diaz, Verónica Martín-Molina, Zamkovoy, Zamkovoy   +33 more
core   +2 more sources

La Física al encuentro de la complejidad

Arbor: Ciencia, Pensamiento y Cultura, 2007
A propósito de la conmemoración del Año Mundial de la Física 2005 se presenta una visión panorámica de la física de los sistemas complejos, que constituye una nueva frontera de la Física cuyos orígenes se remontan a comienzos del siglo XX, pero cuyo ...
Miguel A. F. Sanjuán
doaj   +1 more source

Late-time behaviour of the Einstein-Vlasov system with Bianchi I symmetry

, 2010
The late-time behaviour of the Einstein-dust system is well understood for homogeneous spacetimes. For the case of Bianchi I we have been able to show that the late-time behaviour of the Einstein-Vlasov system is well approximated by the Einstein-dust ...
Calogero S, Damour T, Ernesto Nungesser, Heinzle J M, Nungesser E, Rendall A D, Rendall A D, Rendall A D, Sandin P   +8 more
core   +2 more sources

Quasi-Einstein metrics on hypersurface families [PDF]

, 2012
We construct quasi-Einstein metrics on some hypersurface families. The hypersurfaces are circle bundles over the product of Fano, K\"ahler-Einstein manifolds.
Hall, Stuart James
core   +2 more sources

Depiction of Space-Time Ontological Geometry Based on Mulla Sadra and Einstein’s Epistemological Bases [PDF]

Journal of Philosophical Investigations
The purpose of this article is to explain the quality of creation and examine the essence of space-time based on Sadra'i philosophy and its comparison with physical propositions. The present descriptive-analytical article explores two issues. One is from
Meysam Mozaka, Mahdi Dehbashi, Mohammad-Reza Shamshiri   +2 more
doaj   +1 more source

Einstein's grandchildren [PDF]

EMBO reports, 2010
The new German government has boldly promised to “lead Germany to first place in the world in education, science and research.” Howy Jacobs explores this promise and whether it will lure Einstein's grandchildren back across the pond.
openaire   +2 more sources

Einstein and $$\eta $$-Einstein Sasakian submanifolds in spheres [PDF]

Annali di Matematica Pura ed Applicata (1923 -), 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Cappelletti-Montano B., Loi A.
openaire   +1 more source

Beta-almost Ricci solitons on Sasakian 3-manifolds

Cubo, 2019
In this paper we characterize the Sasakian 3-manifolds admitting β-almost Ricci solitons whose potential vector field is a contact vector field. Among others we prove that a β-almost Ricci soliton whose potential vector field is a contact vector field on
Pradip Majhi, Debabrata Kar
doaj   +1 more source