Gravitational blueshift from a collapsing object

Lingyao Kong; Daniele Malafarina; Cosimo Bambi

doi:10.1016/j.physletb.2014.12.022

Gravitational blueshift from a collapsing object

Lingyao Kong, Daniele Malafarina, Cosimo Bambi

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	82-86
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	741
DOIs	https://doi.org/10.1016/j.physletb.2014.12.022
Publication status	Published - Feb 4 2015
Externally published	Yes

Fingerprint

radiation

relativistic effects

relativity

intervals

vacuum

propagation

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

Kong, L., Malafarina, D., & Bambi, C. (2015). Gravitational blueshift from a collapsing object. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 741, 82-86. https://doi.org/10.1016/j.physletb.2014.12.022

Gravitational blueshift from a collapsing object. / Kong, Lingyao; Malafarina, Daniele; Bambi, Cosimo.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 741, 04.02.2015, p. 82-86.

Research output: Contribution to journal › Article

Kong, L, Malafarina, D & Bambi, C 2015, 'Gravitational blueshift from a collapsing object', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 741, pp. 82-86. https://doi.org/10.1016/j.physletb.2014.12.022

Kong L, Malafarina D, Bambi C. Gravitational blueshift from a collapsing object. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2015 Feb 4;741:82-86. https://doi.org/10.1016/j.physletb.2014.12.022

Kong, Lingyao ; Malafarina, Daniele ; Bambi, Cosimo. / Gravitational blueshift from a collapsing object. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2015 ; Vol. 741. pp. 82-86.

@article{4c287ab03afa4e36982470446287806d,

title = "Gravitational blueshift from a collapsing object",

abstract = "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.",

author = "Lingyao Kong and Daniele Malafarina and Cosimo Bambi",

year = "2015",

month = "2",

day = "4",

doi = "10.1016/j.physletb.2014.12.022",

language = "English",

volume = "741",

pages = "82--86",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

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

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 -

Access to Document

10.1016/j.physletb.2014.12.022