3 papers
gr-qc2026
Closed Timelike Curves from a Vacuum Traveling Wave
Semin Xavier
We construct an exact vacuum spacetime that develops closed timelike curves from regular, asymptotically flat initial data respecting the weak, dominant, and strong energy conditio…
gr-qc2023
Infinitely degenerate slowly rotating solutions in gravity
Alan Sunny, Semin Xavier, S. Shankaranarayanan
This work tests the no-hair conjecture in gravity models. No-hair conjecture asserts that all black holes in General Relativity coupled to any matter must be Kerr-Newman typ…
gr-qc2020
Infinitely degenerate exact Ricci-flat solutions in f(R) gravity
Semin Xavier, Jose Mathew, S. Shankaranarayanan
We obtain an infinite number of exact static, Ricci-flat spherically symmetric vacuum solutions for a class of f(R) theories of gravity. We analytically derive two exact vacuum bla…