4 papers · 1 filter
Cosmic Strings Coupled With a Massless Scalar Field
Ozay Gurtug, Izzet Sakalli
A scalar field generalization of Xanthopoulos's cylindrically symmetric solutions of the vacuum Einstein equation is obtained. The obtained solution preserves the properties of the…
Null Singularity Formation by Scalar Fields in Colliding Waves and Black Holes
Ozay Gurtug, Mustafa Halilsoy
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…
Null Singularities in Colliding Waves
Ozay Gurtug, Mustafa Halilsoy
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 sta…
Horizon Instability in the Cross Polarized Bell-Szekeres Spacetime
Ozay Gurtug, Mustafa Halilsoy
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 Hel…