Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Alicia Di Prisco"'
Publikováno v:
Symmetry, Vol 16, Iss 11, p 1422 (2024)
Exact solutions are presented which describe, either the evolution of fluid distributions corresponding to a ghost star (vanishing total mass), or describing the evolution of fluid distributions which attain the ghost star status at some point of the
Externí odkaz:
https://doaj.org/article/7edb254443c84b2a9c0f5ca9a90b3656
Publikováno v:
Symmetry, Vol 16, Iss 5, p 562 (2024)
We explore an idea put forward many years ago by Zeldovich and Novikov concerning the existence of compact objects endowed with arbitrarily small mass. The energy density of such objects, which we call “ghost stars”, is negative in some regions o
Externí odkaz:
https://doaj.org/article/6ad64897ca8e4583a66a11761aa4c464
Publikováno v:
Symmetry, Vol 16, Iss 3, p 341 (2024)
A seminumerical approach proposed many years ago for describing gravitational collapse in the post-quasi-static approximation is modified in order to avoid the numerical integration of the basic differential equations the approach is based upon. For
Externí odkaz:
https://doaj.org/article/1a89e737217a4e4bb6e8476bf761cf5e
Publikováno v:
Entropy, Vol 25, Iss 9, p 1338 (2023)
We carry out a systematic study on the motion of test particles in the region inner to the naked singularity of a quasi-hyperbolically symmetric γ-metric. The geodesic equations are written and analyzed in detail. The obtained results are contrasted
Externí odkaz:
https://doaj.org/article/414145a1195c4db080ab5958ef77fd00
Publikováno v:
Symmetry, Vol 15, Iss 3, p 754 (2023)
We search for exact analytical solutions of spherically symmetric dissipative fluid distributions satisfying the vanishing expansion condition (vanishing expansion scalar Θ). To accomplish this, we shall impose additional restrictions allowing integ
Externí odkaz:
https://doaj.org/article/a150d8e554214eacab5094cd9bdc11bb
Publikováno v:
Universe, Vol 8, Iss 6, p 296 (2022)
We carry on a general study on non-static spherically symmetric fluids admitting a conformal Killing vector (CKV). Several families of exact analytical solutions are found for different choices of the CKV in both the dissipative and the adiabatic reg
Externí odkaz:
https://doaj.org/article/07a9bf2c3a524e2986c733642c19852f
Publikováno v:
Entropy, Vol 23, Iss 9, p 1219 (2021)
We study fluid distributions endowed with hyperbolic symmetry, which share many common features with Lemaitre–Tolman–Bondi (LTB) solutions (e.g., they are geodesic, shearing, and nonconformally flat, and the energy density is inhomogeneous). As s
Externí odkaz:
https://doaj.org/article/fbaeaddf39ae4f17b35b7c18d84672ab
Publikováno v:
Symmetry, Vol 13, Iss 9, p 1568 (2021)
We study the general properties of dissipative fluid distributions endowed with hyperbolical symmetry. Their physical properties are analyzed in detail. It is shown that the energy density is necessarily negative, and the central region cannot be att
Externí odkaz:
https://doaj.org/article/2b4ef8ffbe2f4bb9b8e5b604614a25f5
Autor:
L. Herrera, Alicia Di Prisco
Publikováno v:
Foundations of Physics Letters. 15:373-383
The Thomas precession is calculated using three different transformations to the rotating frame. It is shown that for sufficiently large values of v/c, important differences in the predicted angle of precession appear, depending on the transformation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eda01ffce88f4b16888a373d010ccae4
https://doi.org/10.1023/a:1021268628566
https://doi.org/10.1023/a:1021268628566
Publikováno v:
General Relativity and Gravitation. 32:2091-2097
We comment on recently proposed dissipative inflationary models. It is shown that the strength of the inflationary expansion is related to a specific combination of thermodynamic variables which is known to measure the instability of self-gravitating
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71ded51d20c7be0bd06a3f0197e321a4
https://doi.org/10.1023/a:1001990217528
https://doi.org/10.1023/a:1001990217528