Results 51 to 60 of about 87 (65)
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Rendiconti del Circolo Matematico di Palermo, 1988
Let (M,U,\(\xi\),\(\Omega\),\(\eta\),g) be a para-coKählerian manifold of dimension \(2m+1\). Here, g is a pseudo-Riemannian metric of signature \((m+1,m)\), \(\xi\) is the canonical vector field (which is supposed to be concircular), U is the paracomplex operator, \(\eta\) is the structure 1- form and \(\Omega\) the fundamental 2-form.
Buchner, K., Rosca, R.
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Let (M,U,\(\xi\),\(\Omega\),\(\eta\),g) be a para-coKählerian manifold of dimension \(2m+1\). Here, g is a pseudo-Riemannian metric of signature \((m+1,m)\), \(\xi\) is the canonical vector field (which is supposed to be concircular), U is the paracomplex operator, \(\eta\) is the structure 1- form and \(\Omega\) the fundamental 2-form.
Buchner, K., Rosca, R.
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On the concircular vector fields of spaces with affine connection
2017Summary: In this paper we study concircular vector fields of spaces with affine connection. We found the fundamental equation of these fields for the minimal requirements on the differentiability of the connection. The maximal numbers of linearly independent fields (with constant coefficients) is equal to \(n + 1\) and is realized only on projective at
Hinterleitner, Irena +3 more
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On concircular and torse-forming vector fields on compact manifolds
2010Summary: In this paper we modify the theorem by E. Hopf and found results and conditions, on which concircular, convergent and torse-forming vector fields exist on (pseudo-) Riemannian spaces. These results are applied for conformal, geodesic and holomorphically projective mappings of special compact spaces without boundary.
Mikes, Josef, Chodorová, Marie
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International Journal of Geometric Methods in Modern Physics
We obtained the solutions of Einstein’s Field Equations (EFEs) for locally rotationally symmetric (LRS) Bianchi type-I perfect fluid spacetimes through the concircular vector fields (CCVFs) in [Formula: see text] gravity. It is shown that such metrics admit CCVFs of 4, 5, 6, 7, 8 and 15 dimensions. We also calculated the energy density, fluid pressure,
Suhail Khan +3 more
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We obtained the solutions of Einstein’s Field Equations (EFEs) for locally rotationally symmetric (LRS) Bianchi type-I perfect fluid spacetimes through the concircular vector fields (CCVFs) in [Formula: see text] gravity. It is shown that such metrics admit CCVFs of 4, 5, 6, 7, 8 and 15 dimensions. We also calculated the energy density, fluid pressure,
Suhail Khan +3 more
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International Electronic Journal of Geometry
In this work we obtained solutions of field equations for perfect fluid spherically symmetric static spacetimes and found their concircular vector fields (CCVFs) in $f(R,T)$ gravity theory. It came out that special classes of these spacetimes possess either $4$-dimensional or $15$-dimensional CCVFs.
Sami Ul Haq +3 more
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In this work we obtained solutions of field equations for perfect fluid spherically symmetric static spacetimes and found their concircular vector fields (CCVFs) in $f(R,T)$ gravity theory. It came out that special classes of these spacetimes possess either $4$-dimensional or $15$-dimensional CCVFs.
Sami Ul Haq +3 more
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Concircular Vectors Field in (kappa; mu)-Contact Metric Manifolds
2017The aim of the present paper is to study (kappa,mu)-contact manifolds admitting a non-null concircularvector field and concurrent vector field. We prove that in both the cases the manifold becomes aSasakian manifold under certain restriction on kappa, mu.
MAJHİ, Pradip, GHOSH, Gopal
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Lightlike hypersurfaces in spaces with concircular fields
Arabian Journal of Mathematics, 2021Samuel Ssekajja
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Geodesic Mappings of Vn(K)-Spaces and Concircular Vector Fields
Mathematics, 2019Josef Mikes +2 more
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