Results 71 to 80 of about 1,253 (179)
Submanifolds with parallel Ricci tensor [PDF]
Kodai Mathematical Journal, 1988 The author gives a classification of submanifolds of a Riemannian manifold of constant sectional curvature having parallel Ricci tensor, parallel mean curvature vector field and trivial normal connection. A corollary is the classification of 2-codimensional Einstein submanifolds of a Riemannian manifold of constant sectional curvature having parallel ...
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Deformations of unduloid with stationary Ricci tensor
Pracì Mìžnarodnogo Geometričnogo CentruIn this paper we consider first-order infinitesimal deformations of simply connected regular surfaces in three-dimensional Euclidean space with a stationary Ricci tensor.
Nina Vashpanova +2 more
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Nonassociative differential geometry and gravity with non-geometric fluxes
Journal of High Energy Physics, 2018 We systematically develop the metric aspects of nonassociative differential geometry tailored to the parabolic phase space model of constant locally non-geometric closed string vacua, and use it to construct preliminary steps towards a nonassociative ...
Paolo Aschieri +2 more
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The Revo‐Evo Debate in the History and Philosophy of Science
Natural Sciences, Volume 6, Issue 3, July 2026.The paper juxtaposes revolutionary and evolutionary positions in epistemology in general as well as the history of science. While it deems the evolutionary arguments more persuasive, it also stresses the dependence of our assessment of change on the language we choose to describe the theories and positions under consideration.
Yemima Ben‐Menahem
wiley +1 more source
A (CHR)3-flat trans-Sasakian manifold
Pracì Mìžnarodnogo Geometričnogo Centru, 2019 In [4] M. Prvanovic considered several curvaturelike tensors defined for Hermitian manifolds. Developing her ideas in [3], we defined in an almost contact Riemannian manifold another new curvaturelike tensor field, which is called a contact ...
Koji Matsumoto
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Mass-induced instability of SAdS black hole in Einstein–Ricci cubic gravity
European Physical Journal C: Particles and Fields, 2018 We perform the stability analysis of Schwarzschild-AdS (SAdS) black hole in the Einstein–Ricci cubic gravity. It shows that the Ricci tensor perturbations exhibit unstable modes for small black holes.
Yun Soo Myung
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New Way to Calculate Ricci Tensor and Ricci Scalar
Journal of High Energy Physics, Gravitation and Cosmology, 2019 In the theory of general relativity, the finding of the Einstein Field Equation happens in a complex mathematical operation, a process we don’t need any more. Through a new theory in vector analysis, we’ll see that we can calculate the components of the Ricci tensor, Ricci scalar, and Einstein Field Equation directly in an easy way without the need to ...
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∗−Conformal η−Ricci Solitons on α−Cosymplectic Manifolds
International Journal of Analysis and Applications, 2021 The object of this paper is to study ∗−conformal η−Ricci solitons on α−cosymplectic manifolds. First, α−cosymplectic manifolds admitting ∗−conformal η−Ricci solitons satisfying the conditions R(ξ, .) · S and S(ξ, .) · R = 0 are being studied.
Abdul Haseeb, D. G. Prakasha, H. Harish
doaj
Some Properties of Generalized Einstein Tensor for a Pseudo-Ricci Symmetric Manifold
Advances in Mathematical Physics, 2020 The object of the paper is to study some properties of the generalized Einstein tensor GX,Y which is recurrent and birecurrent on pseudo-Ricci symmetric manifolds PRSn. Considering the generalized Einstein tensor GX,Y as birecurrent but not recurrent, we
S. Aynur Uysal +1 more
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Geometric Perspective of Relativistic Bulk Viscous Fluid String Spacetime
AxiomsThe goal of the article is to examine the behavior of bulk viscous fluid string spacetime with a fluid density of the bulk viscous fluid string ρ and a tension of the bulk viscous fluid string λ.
Mohd Danish Siddiqi, Ibrahim Al-Dayel
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