Colliding gravitational waves in general relativity.

Halil, Mustafa


Second-order scalar-tensor field theories
Şahin, Ertan Sinan; Sarıoğlu, Bahtiyar Özgür; Department of Physics (2017)
We review Horndeski’s scalar-tensor theory in this thesis. Partial differential equations that are satisfied by the Lagrangian limit its most general form. Demanding second-order field equations both for the metric and the scalar field, and choosing a four-dimensional spacetime also put restrictions on the most general form of the Lagrangian. Besides, by using similar techniques, in a four-dimensional spacetime, we find the most general form of the second-order Euler-Lagrange equations that are obtained fro...
Kerr-Schild geometry and string in general relativity.
Gürses, Metin; Gürsey, Feza; Department of Physics (1975)
Harmonic mappings of Riemannian manifolds and Einstein field equations of gravitation.
Eriş, Ahmet; Nutku, Yavuz; Department of Physics (1976)
Height Estimation for Ballistic Platforms using Differential Measurements
Vural, Aydin; Sengul, Orhan; Demir, Şimşek; Hizal, Altunkan (2013-10-01)
Use of radio waves is a very common choice for proximity fuzes. The stand-off distance for fuzes varies between a lower and an upper limit depending on the electromagnetic reflectivity of terrain (target). If the reflectivity of the terrain is comparably higher, the return power at the receiver reaches to the threshold level more quickly and the stand-off distance increases. The work presented here introduces an approach to estimate the height of airborne ballistic platforms more precisely compared with the...
Optimization of vibration characteristics of a radar antenna structure
Baran, İsmet; Özgen, Gökhan Osman; Ciğeroğlu, Ender; Department of Mechanical Engineering (2011)
Radar antenna structures especially array antennas which are integrated onto structures of aerial vehicles are subject to dynamic structural and aerodynamic loads. Due to occurrences of these dynamic loads there will be certain dynamic deformations which affect the antenna’s performance in an adverse manner. The influence of deformations and vibrations are important on array antenna structures, since they cause a change in orientation of elements of the phased array antenna which affects the gain of the ant...
Citation Formats
M. Halil, “Colliding gravitational waves in general relativity.,” Ph.D. - Doctoral Program, Middle East Technical University, 1977.