Results 1 to 10 of about 891,111 (373)

Boundary conditions for hyperbolic formulations of the Einstein equations [PDF]

, 2003
In regards to the initial-boundary value problem of the Einstein equations, we argue that the projection of the Einstein equations along the normal to the boundary yields necessary and appropriate boundary conditions for a wide class of equivalent ...
Abrahams A M, Anderson A, Arnowitt R, Baumgarte T W, Frittelli S, Frittelli S, Frittelli S, Gustaffson B, Kidder L E, Lehner L, Reula O A, Roberto G mez, Shibata M, Shinkai H, Simonetta Frittelli, Stewart J M, Szilágyi B, Weinberg S, York J W   +18 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

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

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

Variability of fundamental constants

, 2002
If the fine structure constant is not really constant, is this due to a variation of $e$, $\hbar$, or $c$? It is argued that the only reasonable conclusion is a variable speed of light.Comment: preliminary draft, comments ...
ASHER PERES, Einstein A., Einstein A., Einstein A., Schouten J. A.   +4 more
core   +1 more source

Doubly Special Relativity with a minimum speed and the Uncertainty Principle

, 2017
The present work aims to search for an implementation of a new symmetry in the space-time by introducing the idea of an invariant minimum speed scale ($V$).
CLÁUDIO NASSIF, Einstein A., Einstein A., Einstein A., Einstein A., Einstein A., Einstein A., FitzGerald G. F., Jordan P., Kaluza T., Licata I., Mach E., Magueijo J., Poincaré H., Schrödinger E.   +14 more
core   +1 more source

Lorentz group theory and polarization of the light

, 2011
Some facts of the theory of the Lorentz group are specified for looking at the problems of light polarization optics in the frames of vector Stokes-Mueller and spinor Jones formalism.
A. Einstein, A. Einstein, V. M. Red’kov   +2 more
core   +1 more source