Zobrazeno 1 - 10
of 6 616
pro vyhledávání: '"Perfect fluid"'
Publikováno v:
AIMS Mathematics, Vol 9, Iss 10, Pp 28306-28319 (2024)
Given an immersed hypersurface $ M^{n} $ in the Euclidean space $ E^{n+1} $, the tangential component $\boldsymbol{\omega }$ of the position vector field of the hypersurface is called the basic vector field, and the smooth function of the normal comp
Externí odkaz:
https://doaj.org/article/268ae993bdb948fd8b4f01c11c3696d3
Autor:
Sakineh Hajiaghasi, Shahroud Azami
Publikováno v:
Journal of Mahani Mathematical Research, Vol 13, Iss 2, Pp 1-12 (2024)
The main purpose of the present paper is about characterizing the properties of the perfect fluid space-time that admits the gradient Ricci-Bourguignon soliton. This gives some results about the stability of the energy-momentum tensor and also under
Externí odkaz:
https://doaj.org/article/b82ad72d1a10472eb23e0d1d07b4f5d0
Autor:
Mohd. Danish Siddiqi, Fatemah Mofarreh
Publikováno v:
AIMS Mathematics, Vol 9, Iss 8, Pp 21628-21640 (2024)
In this research note, we investigated the characteristics of perfect fluid spacetime when coupled with the hyperbolic Ricci soliton. We additionally interacted with the perfect fluid spacetime, with a $ \varphi(\mathcal{Q}) $-vector field and a bi-c
Externí odkaz:
https://doaj.org/article/67dc610f71714eeface02239b71d0e26
Publikováno v:
AIMS Mathematics, Vol 9, Iss 7, Pp 18929-18943 (2024)
In the present paper, we investigate perfect fluid spacetimes and perfect fluid generalized Roberston-Walker spacetimes that contain a torse-forming vector field satisfying almost hyperbolic Ricci solitons. We show that the perfect fluid spacetimes t
Externí odkaz:
https://doaj.org/article/02ecf0ff6a6249b6a8a461fea000584e
Publikováno v:
East European Journal of Physics, Iss 1, Pp 102-111 (2024)
Bianchi Type-I cosmological models have been a subject of extensive research in cosmology due to their simplicity and relevance in understanding the dynamics of the early Universe. In this study, we investigate the dynamics of such models within the
Externí odkaz:
https://doaj.org/article/3b6c0d417e35474a8a67d1ef3a8b7d19
Autor:
Jafar Sadeghi, Saeed Noori Gashti
Publikováno v:
Physics Letters B, Vol 853, Iss , Pp 138651- (2024)
A possible violation of the weak gravity conjecture (WGC) by cosmic censorship is one of the major challenges in the field of general relativity. The cosmic censorship is a fundamental principle that ensures the consistency of the theory of gravity.
Externí odkaz:
https://doaj.org/article/b3603c4b65224b56b3c991505fb5d07f
Modified F(R,T2)-Gravity Coupled with Perfect Fluid Admitting Hyperbolic Ricci Soliton Type Symmetry
Autor:
Mohd Danish Siddiqi, Fatemah Mofarreh
Publikováno v:
Axioms, Vol 13, Iss 10, p 708 (2024)
In the present research note, we discuss the energy–momentum squared gravity model F(R,T2) coupled with perfect fluid. We obtain the equation of state for the perfect fluid in the F(R,T2)-gravity model. Furthermore, we deal with the energy–moment
Externí odkaz:
https://doaj.org/article/0477298eec954a019d9bde3978e3ce89
Akademický článek
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Akademický článek
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Publikováno v:
Mathematics, Vol 12, Iss 17, p 2628 (2024)
For a compact Riemannian m-manifold (Mm,g),m>1, endowed with a nontrivial conformal vector field ζ with a conformal factor σ, there is an associated skew-symmetric tensor φ called the associated tensor, and also, ζ admits the Hodge decomposition
Externí odkaz:
https://doaj.org/article/4ef26440172d478097cfc69dcfbc9f6e