16,592 research outputs found
All spherically symmetric charged anisotropic solutions for compact star
In the present paper we develop an algorithm for all spherically symmetric
anisotropic charged fluid distribution. Considering a new source function
we find out a set of solutions which is physically well behaved and
represent compact stellar models. A detailed study specifically shows that the
models actually correspond to strange stars in terms of their mass and radius.
In this connection we investigate about several physical properties like energy
conditions, stability, mass-radius ratio, electric charge content, anisotropic
nature and surface redshift through graphical plots and mathematical
calculations. All the features from these studies are in excellent agreement
with the already available evidences in theory as well as observations.Comment: 28 pages, 15 figures, major changes in the text. arXiv admin note:
text overlap with arXiv:1408.5126 by other author
Anisotropic models for compact stars
In the present paper we obtain an anisotropic analogue of Durgapal-Fuloria
(1985) perfect fluid solution. The methodology consists of contraction of
anisotropic factor by the help of both metric potentials and
. Here we consider same as Durgapal-Fuloria (1985)
whereas is that given by Lake (2003). The field equations are solved
by the change of dependent variable method. The solutions set mathematically
thus obtained are compared with the physical properties of some of the compact
stars, strange star as well as white dwarf. It is observed that all the
expected physical features are available related to stellar fluid distribution
which clearly indicate validity of the model.Comment: 18 pages, 13 figures, 4 tables; Published in European Physical
Journal
Generalized model for anisotropic compact stars
In the present investigation an exact generalized model for anisotropic
compact stars of embedding class one is sought for under general relativistic
background. The generic solutions are verified by exploring different physical
aspects, viz. energy conditions, mass-radius relation, stability of the models,
in connection to their validity. It is observed that the model present here for
compact stars is compatible with all these physical tests and thus physically
acceptable as far as the compact star candidates ,
and are concerned.Comment: 19 pages, 12 figures, 3 table
A new model for spherically symmetric anisotropic compact star
In this article we obtain a new anisotropic solution for Einstein's field
equation of embedding class one metric. The solution is representing the
realistic objects such as and . We perform detailed
investigation of both objects by solving numerically the Einstein field
equations under with anisotropic pressure. The physical features of the
parameters depend on the anisotropic factor i.e. if anisotropy is zero
everywhere inside the star then the density and pressures will become zero and
metric turns out to be flat. We report our results and compare with the above
mentioned two compact objects on a number of key aspects: the central density,
the surface density onset and the critical scaling behavior, the effective mass
and radius ratio, the anisotropization with isotropic initial conditions,
adiabatic index and red shift. Along with this we have also made a comparison
between the classical limit and theoretical model treatment of the compact
objects. Finally we discuss the implications of our findings for the stability
condition in relativistic compact star.Comment: 13 pages, 9 figures, 2 table
Market Integration, Soccer, and the EU: Changes in the Game’s Core Territories
This paper uses soccer as a lens to look at governance structures and how they affect labor markets and economic outcomes in major European countries. It looks at three different models of soccer governance: “coordinated,” “liberal,” and “neutral,” found in the five major European soccer leagues (England, Germany, Spain, Italy, and France) and suggests that coordinated structures may have a comparative advantage over liberal structures
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Privacy-Preserving iVector-Based Speaker Verification
This paper introduces an efficient algorithm to develop a privacy-preserving voice verification based on iVector and linear discriminant analysis techniques. This research considers a scenario in which users enrol their voice biometric to access different services (i.e., banking). Once enrolment is completed, users can verify themselves using their voice print instead of alphanumeric passwords. Since a voice print is unique for everyone, storing it with a third-party server raises several privacy concerns. To address this challenge, this paper proposes a novel technique based on randomization to carry out voice authentication, which allows the user to enrol and verify their voice in the randomized domain. To achieve this, the iVector-based voice verification technique has been redesigned to work on the randomized domain. The proposed algorithm is validated using a well-known speech dataset. The proposed algorithm neither compromises the authentication accuracy nor adds additional complexity due to the randomization operations
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