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Exact Solutions for Colliding Neutrino Waves and the Absence of Mutual Scattering for a Single Grassmann Mode
Yorgo Senikoglu
We study the head-on collision of two plane neutrino waves in the coupled Einstein-Weyl system, treating the massless Weyl spinor as an odd Grassmann valued field. We show that the…
Majorana Neutrinos in Sandwich Wave Spacetimes: Flavor Modulation and Helicity Transitions
Yorgo Senikoglu
We present the propagation of massive Majorana neutrinos crossing an exact gravitational sandwich wave background. By employing a Takagi factorization to decouple the matrix field…
An Explicit Kaluza-Klein Reduction of Einstein's Gravity in on
Tekin Dereli, Yorgo Senikoglu
We study a six-dimensional Kaluza-Klein theory with spacetime topology and analyze the gauge sector arising from dimensional reduction. Using normalized Killing ve…
Scattering of massive neutrino test fields from a gravitational pulse
Tekin Dereli, Yorgo Senikoglu
Linearized Einstein-Weyl equations are solved precisely in the context of sandwich gravitational waves. The neutrino's energy-momentum depends on the geometry and composition of th…
Colliding Gravitino Plane Waves in Simple Supergravity
Tekin Dereli, Yorgo Senikoglu
We give a family of exact solutions of supergravity field equations in dimensions that describe the collision of plane-fronted gravitino waves.
Weyl Neutrinos In Plane Symmetric Spacetimes
Tekin Dereli, Yorgo Senikoglu
We investigate complex quaternion-valued exterior differential forms over 4-dimensional Lorentzian spacetimes and explore Weyl spinor fields as minimal left ideals within the compl…
Scattering of complex gravitino test fields from a gravitational pulse
Yorgo Senikoglu
Gravitational pulse waves are defined as step functions at the boundaries. In this setting, linearized Rarita-Schwinger equations are precisely solved in Rosen coordinates. It is f…
Variational Field Equations of a Majorana Neutrino Coupled to Einstein's Theory of General Relativity
Tekin Dereli, Yorgo Senikoglu
A consistent variational derivation of the Majorana 4-spinor field equations coupled to Einstein's theory of gravitation is given. The equivalence of the first and the second order…
Simple Supergravity pp-Waves
Tekin Dereli, Yorgo Senikoglu
Non-gauge generated exact solutions of simple supergravity field equations that describe pp-waves in Rosen coordinates are presented in the language of complex quaternion valued ex…
Neutrino Fields in a Sandwich Gravitational Wave Background
Tekin Dereli, Ozay Gurtug, Mustafa Halilsoy +1
Sandwich gravitational waves are given globally in terms of step functions at the boundaries. Linearized Einstein-Weyl equations are solved exactly in this background in Rosen coor…
Non-Minimally Coupled Einstein-Yang-Mills Field Equations and Wu-Yang Monopoles in Bertotti-Robinson Spacetimes
Tekin Dereli, Yorgo Senikoglu
Bertotti-Robinson spacetimes are topologically and described by a conformally flat metric. Together with the Coulomb electric potential, they provide a class of…
Electric Charge Screening By Non-Minimal Couplings Of Electromagnetic Fields To Gravity
Tekin Dereli, Yorgo Senikoglu
A case of non-minimal couplings between gravity and electromagnetic fields is presented. The field equations are worked out in the language of exterior differential forms. An exact…
A non-minimally coupled, conformally extended Einstein-Maxwell theory of pp-waves
Tekin Dereli, Yorgo Senikoglu
A non-minimal coupling of Weyl curvatures to electromagnetic fields is considered in Brans-Dicke-Maxwell theory. The gravitational field equations are formulated in a Riemannian sp…
Dark range of in Brans-Dicke gravity
Tekin Dereli, Yorgo Senikoglu
The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are presented in a Riemannian and non-Riemannian setting in the language of exterior differential…
Gravitational Plane Waves in a Non-Riemannian Description of Brans-Dicke Gravity
Tekin Dereli, Yorgo Senikoglu
The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are given in a non-Riemannian setting in the language of exterior differential forms over 4-dimen…
Non-Riemannian Description of Robinson-Trautman Spacetimes in Brans-Dicke Theory Of Gravity
Muzaffer Adak, Tekin Dereli, Yorgo Senikoglu
The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are given in a non-Riemannian setting in the language of exterior differential forms over 4-dimen…
Cosmological isotropic matter-energy generalizations of Schwarzschild and Kerr metrics
Metin Arik, Yorgo Senikoglu
We present a time dependent isotropic fluid solution around a Schwarzschild black hole. We offer the solutions and discuss the effects on the field equations and the horizon. We de…
The Atmosphere of a Black Hole
Metin Arik, Yorgo Senikoglu
We present a static, isotropic fluid solution around a black hole and its effects on the field equations and the horizon. We offer the solutions, their descriptions and we comment…