TY - JOUR
T1 - Gravitational blueshift from a collapsing object
AU - Kong, Lingyao
AU - Malafarina, Daniele
AU - Bambi, Cosimo
PY - 2015/2/4
Y1 - 2015/2/4
N2 - We discuss a counterintuitive phenomenon of classical general relativity, in which a significant fraction of the radiation emitted by a collapsing object and detected by a distant observer may be blueshifted rather than redshifted. The key-point is that when the radiation propagates inside the collapsing body, it is blueshifted, and this time interval may be sufficiently long for the effect to be larger than the later redshift due to the propagation in the vacuum exterior, from the surface of the body to the distant observer. Unfortunately, the phenomenon can unlikely have direct observational implications, but it is interesting by itself as a pure relativistic effect.
AB - We discuss a counterintuitive phenomenon of classical general relativity, in which a significant fraction of the radiation emitted by a collapsing object and detected by a distant observer may be blueshifted rather than redshifted. The key-point is that when the radiation propagates inside the collapsing body, it is blueshifted, and this time interval may be sufficiently long for the effect to be larger than the later redshift due to the propagation in the vacuum exterior, from the surface of the body to the distant observer. Unfortunately, the phenomenon can unlikely have direct observational implications, but it is interesting by itself as a pure relativistic effect.
UR - http://www.scopus.com/inward/record.url?scp=84919684217&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84919684217&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2014.12.022
DO - 10.1016/j.physletb.2014.12.022
M3 - Article
AN - SCOPUS:84919684217
VL - 741
SP - 82
EP - 86
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -