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Mobile game development for children with down syndrome
(International Association of Online Engineering, 2021)Children with diagnosis of down syndrome has different kinds of personalities, mental states, and talents similar to other children. The key point is that every child needs proper support at the right time. There are ... 
Quantum probe of timelike naked singularities for electrically and magnetically charged black holes in a model of nonlinear electrodynamics
(World Scientific Connecting Great Minds, 2020)The timelike naked singularities of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov is investigated within the framework of quantum ... 
Gravitational lensing in rotating and twisting universes
(Elsevier, 2021)Gravitational lensing caused by the gravitational field of massive objects has been studied and acknowledged for a long period of time. In this paper, however, we propose a different mechanism where the bending of light ... 
Gravitational lensing in a model of nonlinear electrodynamics: the case for electrically and magnetically charged compact objects
(Wiley Online Library, 2020)This paper aims to investigate the astrophysical applicability of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov (Ann. Phys. Berlin ... 
Reductions of topologically massive gravity II. First order realizations of second order Lagrangians
(American Institute of Physics, 2020)Second order degenerate Clement and SaroluTekin Lagrangians are casted into forms of various first order Lagrangians. The structures of the iterated tangent bundle and acceleration bundle are presented as a suitable ... 
The effect of sources on the inner horizon of black holes
(APS Physics, 2001)Single pulse of null dust and colliding null dusts both transform a regular horizon into a spacelike singularity in the space of colliding waves. The local isometry between such spacetimes and black holes extrapolates ... 
Null singularity formation by scalar fields in colliding waves and black holes
(Cornell University, 2002)It was believed that when gravitational, electromagnetic and scalar waves interact, a spacelike curvature singularity or Cauchy horizon develops because of mutual focusing. We show with an exact solution that the collision ... 
Reflection of electromagnetic waves from mixtures of plane gravitational and scalar waves
(APS Physics, 2006)We consider colliding wave packets consisting of hybrid mixtures of electromagnetic, gravitational and scalar waves. Irrespective of the scalar field, the electromagnetic wave still reflects from the gravitational wave. ... 
Effect of NUT parameter on the analytic extension of the Cauchy horizon that develop in colliding wave spacetimes
(WorldScientific, 2009)The Cauchy horizon forming colliding wave solution due to Chandrasekhar and Xanthopoulos (CX) has been generalized by inclusion of the NUT ( Newman  Unti  Tamburino) parameter. This is done by transforming the part of ... 
Horizon instability in the cross polarized Bell  Szekeres spacetime
(Cornell University, 2000)The quasiregular singularities (horizons) that form in the collision of cross polarized electromagnetic waves are, as in the linear polarized case, unstable. The validity of the HelliwellKonkowski stability conjecture ... 
Null singularities in colliding waves
(Cornell University, 2001)Colliding Einstein  Maxwell  Scalar fields need not necessarily doomed to become in a spacelike singularity. Examples are given in which null singularities emerge as intermediate stages between a spacelike singularity ... 
Cosmic strings coupled with a massless scalar field
(Springerlink, 2003)A scalar field generalization of Xanthopoulos’s cylindrically symmetric solutions of the vacuum Einstein equations is obtained. The obtained solution preserves the properties of the Xanthopoulos solution, which are regular ... 
Failure of a stability conjecture in general relativity
(Springerlink, 2002)By employing an exact backreaction geometry, HelliwellKonkowski stability conjecture is shown to fail. This happens when a test null dust is inserted to the interaction region of crosspolarized BellSzekeres spacetime. 
New singular and nonsingular colliding wave solutions in EinsteinMaxwellScalar theory.
(Springerlink, 2003)A technique is given to generate coupled scalar field solutions in colliding EinsteinMaxwell (EM) waves. By employing the Bell  Szekeres solution as seed and depending on the chosen scalar field, it is possible to ... 
Search for gravitational waves through the electromagnetic faraday rotation
(APS Physics, 2007)A method is given which renders indirect detection of strong gravitational waves possible. This is based on the reflection (collision) of a linearly polarized electromagnetic shock wave from (with) a cross polarized ... 
Generating static spherically symmetric blackholes in lovelock gravity
(WorldScientific, 2009)Generalization of a known theorem to generate static, spherically symmetric blackhole solutions in higher dimensional Lovelock gravity is presented. Particular limits, such as GaussBonnet (GB) and/or EinsteinHilbert ... 
Quantum singularities in (2+1) dimensional matter coupled black hole spacetimes
(APS Physics, 2012)Quantum singularities considered in the 3 D BTZ spacetime by Pitelli and Letelier (Phys. Rev. D77: 124030, 2008) is extended to charged BTZ and 3D EinsteinMaxwelldilaton gravity spacetimes. The occurence of naked ... 
A new Einsteinnonlinear electrodynamics solution in 2+1dimensions
(Springerlink, 2013)We introduce a class of solutions in 2 + 1−dimensional EinsteinPowerMaxwell theory for circularly symmetric electric field. The electromagnetic field is considered with an angular component given by Fµν = E0δ t µδ θ ν ... 
Restricted class of colliding EinsteinYangMills plane waves
(WorldScientific, 2009)By gauging an Abelian electromagnetic (em) solution through a nonAbelian transformation and in accordance with a theorem proved long time ago, we construct a simple class of colliding EinsteinYangMills (EYM) plane ... 
Colliding wave solutions in a symmetric nonmetric theory
(Springerlink, 2008)A method is given to generate the nonlinear interaction (collision) of linearly polarized gravity coupled torsion waves in a nonmetric theory. Explicit examples are given in which strong mutual focussing of gravitational ...