On the time delay between ultra-relativistic particles
The time delay between the receptions of ultra-relativistic particles emitted simultaneously is a useful observable for both fundamental physics and cosmology. The expression of the delay when the particles travel through an arbitrary spacetime has been derived recently by Fanizza et al., using a pa...
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2016-09-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316303513 |
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doaj-472b168366ba4127a5b89cd33f0d91072020-11-24T22:54:22ZengElsevierPhysics Letters B0370-26931873-24452016-09-01760C35035310.1016/j.physletb.2016.07.010On the time delay between ultra-relativistic particlesPierre Fleury0Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701, Cape Town, South AfricaThe time delay between the receptions of ultra-relativistic particles emitted simultaneously is a useful observable for both fundamental physics and cosmology. The expression of the delay when the particles travel through an arbitrary spacetime has been derived recently by Fanizza et al., using a particular coordinate system and self-consistent assumptions. The present article shows that this formula enjoys a simple physical interpretation: the relative velocity between two ultra-relativistic particles is constant. This result reveals an interesting kinematical property of general relativity, namely that the tidal forces experienced by ultra-relativistic particles in the direction of their motion are much smaller than those experienced orthogonally to their motion.http://www.sciencedirect.com/science/article/pii/S0370269316303513General relativityNeutrinosCosmic rays |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Pierre Fleury |
| spellingShingle |
Pierre Fleury On the time delay between ultra-relativistic particles Physics Letters B General relativity Neutrinos Cosmic rays |
| author_facet |
Pierre Fleury |
| author_sort |
Pierre Fleury |
| title |
On the time delay between ultra-relativistic particles |
| title_short |
On the time delay between ultra-relativistic particles |
| title_full |
On the time delay between ultra-relativistic particles |
| title_fullStr |
On the time delay between ultra-relativistic particles |
| title_full_unstemmed |
On the time delay between ultra-relativistic particles |
| title_sort |
on the time delay between ultra-relativistic particles |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 1873-2445 |
| publishDate |
2016-09-01 |
| description |
The time delay between the receptions of ultra-relativistic particles emitted simultaneously is a useful observable for both fundamental physics and cosmology. The expression of the delay when the particles travel through an arbitrary spacetime has been derived recently by Fanizza et al., using a particular coordinate system and self-consistent assumptions. The present article shows that this formula enjoys a simple physical interpretation: the relative velocity between two ultra-relativistic particles is constant. This result reveals an interesting kinematical property of general relativity, namely that the tidal forces experienced by ultra-relativistic particles in the direction of their motion are much smaller than those experienced orthogonally to their motion. |
| topic |
General relativity Neutrinos Cosmic rays |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269316303513 |
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AT pierrefleury onthetimedelaybetweenultrarelativisticparticles |
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