The matterantimatter interpretation of Kerr spacetime
Abstract
Repulsive gravity is not very popular in physics. However, one comes across it in at least two main occurrences in general relativity: in the negative$r$ region of Kerr spacetime, and as the result of the gravitational interaction between matter and antimatter, when the latter is assumed to be CPTtransformed matter. Here we show how these two independent developments of general relativity are perfectly consistent in predicting gravitational repulsion and how the above Kerr negative$r$ region can be interpreted as the habitat of antimatter. As a consequence, matter particles traveling along vortical geodesics can pass through the throat of a rotating black hole and emerge as antimatter particles (and vice versa). An experimental definitive answer on the gravitational behavior of antimatter is awaited in the next few years.
 Publication:

Annalen der Physik
 Pub Date:
 August 2015
 DOI:
 10.1002/andp.201500154
 arXiv:
 arXiv:1403.4820
 Bibcode:
 2015AnP...527..507V
 Keywords:

 General Relativity and Quantum Cosmology;
 83C57
 EPrint:
 8 pages, 1 figure. Reference [28] added. This is the prepeer reviewed version of the article accepted for publication in Annalen der Physik