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Warped product Einstein metrics on homogeneous spaces and homogeneous Ricci solitons [PDF]

, 2013
In this paper we consider connections between Ricci solitons and Einstein metrics on homogeneous spaces. We show that a semi-algebraic Ricci soliton admits an Einstein one-dimensional extension if the soliton derivation can be chosen to be normal.
He, Chenxu, Petersen, Peter, Wylie, William   +2 more
core   +1 more source

Einstein’s boxes [PDF]

American Journal of Physics, 2005
At the 1927 Solvay conference, Albert Einstein presented a thought experiment intended to demonstrate the incompleteness of the quantum mechanical description of reality. In the following years, the experiment was modified by Einstein, de Broglie, and several other commentators into a simple scenario involving the splitting in half of the wave function
openaire   +3 more sources

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

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

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

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

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

Einstein e a teoria de caos quântico

Revista Brasileira de Ensino de Física
O trabalho de Einstein intitulado Sobre o teorema quântico de Sommerfeld e de Epstein [1,2], publicado em 1917, propõe uma generalização da regra de quantização de Bohr, Sommerfeld e Epstein para sistemas multidimensionais integráveis.
M.A.M. de Aguiar
doaj   +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

A New Generalized Pythagorean Fuzzy Information Aggregation Using Einstein Operations and Its Application to Decision Making

International Journal of Intelligent Systems, 2016
The objective of this article is to extend and present an idea related to weighted aggregated operators from fuzzy to Pythagorean fuzzy sets (PFSs). The main feature of the PFS is to relax the condition that the sum of the degree of membership functions ...
Harish Garg
semanticscholar   +1 more source