5 papers
Frequency-domain calculation of the self force: the high-frequency problem and its resolution
Leor Barack, Amos Ori, Norichika Sago
The mode-sum method provides a practical means for calculating the self force acting on a small particle orbiting a larger black hole. In this method, one first computes the spheri…
Formation of closed timelike curves in a composite vacuum/dust asymptotically-flat spacetime
Amos Ori
We present a new asymptotically-flat time-machine model made solely of vacuum and dust. The spacetime evolves from a regular spacelike initial hypersurface S and subsequently devel…
A Simplified Mathematical Model for the Formation of Null Singularities Inside Black Holes I - Basic Formulation and a Conjecture
Amos Ori, Dan Gorbonos
Einstein's equations are known to lead to the formation of black holes and spacetime singularities. This appears to be a manifestation of the mathematical phenomenon of finite-time…
Calculating the self force in Schwarzschild spacetime by mode-sum regularization
Leor Barack, Amos Ori
We outline a method for calculating the self force (the "radiation reaction force") acting on a scalar particle in a strong field orbit in a Schwarzschild spacetime. In this method…
Remark on the strength of singularities with a C^0 metric
Amos Ori
Recently Nolan constructed a spherically-symmetric spacetime admitting a spacelike curvature singularity with a regular C^0 metric. We show here that this singularity is in fact we…