2014/03/31 by M. Villata · 1 citation
Physics and Astronomy · #gr-qc #msc:83C57
paper · pdf · doi:10.1002/andp.201500154
published as Ann. Phys. (Berlin) 527, No. 7-8, 507-512 (2015) · 8 pages, 1 figure. Reference [28] added. This is the pre-peer reviewed version of the article accepted for publication in Annalen der Physik
arxiv created 2015/05/12 · arxiv updated 2015/10/01
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 CPT-transformed 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.