Results 11 to 20 of about 95,729 (224)
Para-Sasaki-like Riemannian manifolds and new Einstein metrics [PDF]
Revista De La Real Academia De Ciencias Exactas, Fisicas Y Naturales - Serie A: Matematicas, 2021 We determine a new class of paracontact paracomplex Riemannian manifolds derived from certain cone construction, called para-Sasaki-like Riemannian manifolds, and give explicit examples.
Stefan Ivanov +2 more
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Mathematics, 2019 In the present paper, we study conformal mappings between a connected n-dimension pseudo-Riemannian Einstein manifolds. Let g be a pseudo-Riemannian Einstein metric of indefinite signature on a connected n-dimensional manifold M.
Josef Mikeš +2 more
doaj +2 more sources
Para-Ricci-Like Solitons on Riemannian Manifolds with Almost Paracontact Structure and Almost Paracomplex Structure [PDF]
Mathematics, 2021 We introduce and study a new type of soliton with a potential Reeb vector field on Riemannian manifolds with an almost paracontact structure corresponding to an almost paracomplex structure.
Hristo Manev, Mancho Manev
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Generalised radiating fields in Einstein–Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2020 A five-dimensional spherically symmetric generalised radiating field is studied in Einstein–Gauss–Bonnet gravity. We assume the matter distribution is an extended Vaidya-like source and the resulting Einstein–Gauss–Bonnet field equations are solved for ...
Byron P. Brassel, Sunil D. Maharaj
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Three-dimensional Einstein-like manifolds
Differential Geometry and its Applications, 1992 According to \textit{A. Gray} [Geom. Dedicata 7, 259-280 (1978; Zbl 0378.53018)] the natural action of the orthogonal group on \(\nabla\text{ric}\)-like tensors determines a decomposition of the covariant derivative \(\nabla\text{ric}\) of the Ricci tensor ric of a Riemannian manifold into, in general, three irreducible components.
Jürgen Berndt
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Static traversable wormholes in Lyra manifold [PDF]
, 2017 At first, considering the Einstein framework, we introduce some new static traversable wormholes, and study the effects of a dark energy-like source on them.
Jahromi, A. Sayahian, Moradpour, H.
core +2 more sources
Curvature Forms and Einstein-like Metrics on Sasakian Manifolds
, 1992 Let \((M,g)\) be a Riemannian manifold, \(\text{Ric}(g)\) is the Ricci tensor and \(\nabla\) the Levi-Civita connection of \(g\). The authors denote with \(\mathcal A\) and \(\mathcal B\) the classes of all Riemannian manifolds satisfying the following two conditions, respectively, \[ {\mathfrak G}_{XYZ} [\nabla_ X \text{Ric} (g)] (Y,Z) = 0 ...
Elsa Abbena, Sergio Garbiero
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AppliedMathThe main object of this work is to study the generalized B-curvature tensor in an n-dimensional Lorentzian para-Kenmotsu (briefly, (LPK)n) manifold along a semi-symmetric metric connection ∇¯.
Rajendra Prasad +3 more
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Einstein like (epsilon)-para Sasakian manifolds
, 2013 Einstein like (epsilon)-para Sasakian manifolds are introduced. For an (epsilon)-para Sasakian manifold to be Einstein like, a necessary and sufficient condition in terms of its curvature tensor is obtained. The scalar curvature of an Einstein like (epsilon)-para Sasakian manifold is obtained and it is shown that the scalar curvature in this case must ...
Sadık Keleş +3 more
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Higgs-Dilaton inflation in Einstein-Cartan gravity [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 We study the phenomenology of the Higgs-Dilaton model in the context of Einstein-Cartan gravity, focusing on the separate impact of the Holst and Nieh-Yan terms on the inflationary observables.
Matteo Piani, J. Rubio
semanticscholar +1 more source