Results 61 to 70 of about 103 (82)
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On a recurrent finsler manifold with a concircular vector field
Acta Mathematica Hungarica, 1978Misra, R. B., Meher, F. M., Kishore, N.
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A recurrent Finsler manifold with a concircular vector field
Acta Mathematica Hungarica, 1980P N Pandey
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Concircular vector fields and the Ricci solitons for the LRS Bianchi type-V spacetimes
Modern Physics Letters A, 2020The purpose of this paper is to explore concircular vector fields (CVFs) of locally rotationally symmetric (LRS) Bianchi type-V spacetimes and to investigate whether these CVFs are Ricci soliton vector fields. We first obtained the concircular equations and then solved them by integrating directly.
Amjad Mahmood, Ahmad T. Ali, Suhail Khan
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Concircular vector fields on semi-Riemannian spaces
Journal of Mathematical Sciences, 2007In this paper, we construct an analogue of concircular fields for semi-Riemannian spaces (i.e., for manifolds with degenerate metrics). We find a tensor criterion of spaces admitting the maximal number of concircular fields or having no such fields. We detect a gap in the distribution of dimensions of the space of concircular fields, which, in contrast
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Concircular vector fields on lightlike submanifolds
Summary: Concircular vector fields on lightlike submanifolds are investigated. With the aid of this review, some relations on Ricci soliton lightlike submanifolds containing concircular vector fields are obtained.Gulbahar, Mehmet +3 more
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D-conformal changes in Riemannian manifolds admitting a concircular vector field
TRU Mathematics, 1984In previous papers [ibid. 19, 179-193 (1983; Zbl 0539.53035), and 20, 111-123 (1984; Zbl 0554.53033)], we treated the D-conformal curvature tensor \(B^ h_{kji}\), D-concircular curvature tensors \(U^ h_{kji}\) and \(Z^ h_{kji}\) in a special para-Sasakian manifold, which were introduced by the second author [Tensor, New Ser. 39, 117-123 (1982; Zbl 0517.
ADATI, TYUZI, CHÛNAN, GORÔ
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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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