Gravitational blueshift from a collapsing object
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 colla...
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2015-02-01
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Series: | Physics Letters B |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269314008934 |
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doaj-57791ddb8f9141b589eeaa8b6f2bc5d62020-11-24T21:59:58ZengElsevierPhysics Letters B0370-26932015-02-017418286Gravitational blueshift from a collapsing objectLingyao Kong0Daniele Malafarina1Cosimo Bambi2Center for Field Theory and Particle Physics & Department of Physics, Fudan University, 200433 Shanghai, ChinaCenter for Field Theory and Particle Physics & Department of Physics, Fudan University, 200433 Shanghai, ChinaCorresponding author.; Center for Field Theory and Particle Physics & Department of Physics, Fudan University, 200433 Shanghai, ChinaWe 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.http://www.sciencedirect.com/science/article/pii/S0370269314008934 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lingyao Kong Daniele Malafarina Cosimo Bambi |
spellingShingle |
Lingyao Kong Daniele Malafarina Cosimo Bambi Gravitational blueshift from a collapsing object Physics Letters B |
author_facet |
Lingyao Kong Daniele Malafarina Cosimo Bambi |
author_sort |
Lingyao Kong |
title |
Gravitational blueshift from a collapsing object |
title_short |
Gravitational blueshift from a collapsing object |
title_full |
Gravitational blueshift from a collapsing object |
title_fullStr |
Gravitational blueshift from a collapsing object |
title_full_unstemmed |
Gravitational blueshift from a collapsing object |
title_sort |
gravitational blueshift from a collapsing object |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 |
publishDate |
2015-02-01 |
description |
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. |
url |
http://www.sciencedirect.com/science/article/pii/S0370269314008934 |
work_keys_str_mv |
AT lingyaokong gravitationalblueshiftfromacollapsingobject AT danielemalafarina gravitationalblueshiftfromacollapsingobject AT cosimobambi gravitationalblueshiftfromacollapsingobject |
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1725846137754091520 |