Results 121 to 130 of about 28,894 (211)

On a type of spacetime [PDF]

open access: yesMathematica Moravica, 2014
The object of the present paper is to study a special type of spacetime. It is proved that in a conformally flat (W RS)4 spacetime with non-zero scalar curvature the vector field p defined by ɡ(X, p) = E(X) is irrotational and the integral curves of the ...
Mallick Sahanous, Chand De Uday
doaj  

The Ricci curvature of half-flat manifolds [PDF]

open access: bronze, 2007
Tibra Ali, Gerald Cleaver
openalex   +1 more source

UEG Week 2025 Poster Presentations

open access: yes
United European Gastroenterology Journal, Volume 13, Issue S8, Page S803-S1476, October 2025.
wiley   +1 more source

Generalized teleparallel de Sitter geometries. [PDF]

open access: yesEur Phys J C Part Fields, 2023
Coley AA   +3 more
europepmc   +1 more source

Approximate Ricci-flat Metrics for Calabi-Yau Manifolds

open access: yes
We outline a method to determine analytic Kähler potentials with associated approximately Ricci-flat Kähler metrics on Calabi-Yau manifolds. Key ingredients are numerically calculating Ricci-flat Kähler potentials via machine learning techniques and fitting the numerical results to Donaldson's Ansatz. We apply this method to the Dwork family of quintic
Lee, Seung-Joo, Lukas, Andre
openaire   +2 more sources

Cocalibrated G_2-manifolds with Ricci flat characteristic connection

open access: yes, 2013
Any 7-dimensional cocalibrated G_2-manifold admits a unique connection $\nabla$ with skew symmetric torsion. We study these manifolds under the additional condition that the $\nabla$-Ricci tensor vanishes. In particular, we describe their geometry in case of a maximal number of $\nabla$-parallel vector fields.
openaire   +2 more sources

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