234 research outputs found
Search of wormholes in different dimensional non-commutative inspired space-time with lorentzian distribution
In this paper we are searching whether the wormhole solutions exists in
different dimensional non- commutative inspired spacetimes. It is well known
that the noncommutativity of the space is an outcome of string theory and it
replaced the usual point like object by a smeared object. Here we have chosen
Lorentzian distribution as the density function in the noncommutative inspired
space- time. We have observed that the wormhole solutions exist only in four
and five dimension, however, higher than fine dimension no wormhole exists. For
five dimensional spacetime, we get a wormhole for a restricted region. In usual
four dimensional spacetime, we get a stable wormhole which is asymptotically
flat.Comment: 13 pages,23 figures, Accepted in European Physical Journal
The Dark Energy Star and Stability analysis
We have proposed a new model of dark energy star consisting of five zones
namely, solid core of constant energy density, the thin shell between core and
interior, an inhomogeneous interior region with anisotropic pressures, thin
shell and the exterior vacuum region. We have discussed various physical
properties. The model satisfies all the physical requirements. The stability
condition under small linear perturbation has also been discussed.Comment: 11 pages,16 figures, Accepted in European Physical Journal
Višedimenzijski globalni monopol u Lyrinoj geometriji
We present an approximate solution around a global monopole resulting from a breaking of a global SO(3) symmetry in a five-dimensional space-time based on Lyra’s geometry in normal gauge, i.e., displacement vector φi = (0, 0, 0, 0, β0), where β0 is a constant. Acceleration due to the monopole has been evaluated by studying the geodesic equation. A comparison is made with the classical results.Dajemo približno rješenje oko globalnog monopola koje slijedi kršenje globalne SO(3) simetrije u peto-dimenzijskom prostoru-vremenu, zasnovano na Lyrinoj geometriji u normalnoj baždarnosti, tj., pomačni je vektor φi = (0, 0, 0, 0, β0), uz β0 = const. Ubrzanje zbog monopola odred–uje se promatranjem geodetske jednadžbe. Načinili smo usporedbu s klasičnim rezultatima
Višedimenzijski globalni monopol u Lyrinoj geometriji
We present an approximate solution around a global monopole resulting from a breaking of a global SO(3) symmetry in a five-dimensional space-time based on Lyra’s geometry in normal gauge, i.e., displacement vector φi = (0, 0, 0, 0, β0), where β0 is a constant. Acceleration due to the monopole has been evaluated by studying the geodesic equation. A comparison is made with the classical results.Dajemo približno rješenje oko globalnog monopola koje slijedi kršenje globalne SO(3) simetrije u peto-dimenzijskom prostoru-vremenu, zasnovano na Lyrinoj geometriji u normalnoj baždarnosti, tj., pomačni je vektor φi = (0, 0, 0, 0, β0), uz β0 = const. Ubrzanje zbog monopola odred–uje se promatranjem geodetske jednadžbe. Načinili smo usporedbu s klasičnim rezultatima
A class of interior solutions corresponding to a dimensional asymptotically anti-de Sitter spacetime
Lower dimensional gravity has the potential of providing non-trivial and
valuable insight into some of the conceptual issues arising in four dimensional
relativistic gravitational analysis. The asymptotically anti-de Sitter (2+1)
dimensional spacetime described by Baados, Teitelboim and Zanelli
(BTZ) which admits a black hole solution, has become a source of fascination
for theoretical physicists in recent years. By suitably choosing the form of
the mass function , we derive a new class of solutions for the interior
of an isotropic star corresponding to the exterior (2+1) asymptotically anti-de
Sitter BTZ spacetime. The solution obtained satisfies all the regularity
conditions and its simple analytical form helps us to study the physical
parameters of the configuration in a simple manner.Comment: 5 pages, 5 figures. Accepted for publication in Phys. Lett. B, some
typos are correcte
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