Research output: Contribution to journal › Article › peer-review
Do photons travel faster than gravitons? / Ejlli, Damian.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 2, 035, 19.02.2018.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Do photons travel faster than gravitons?
AU - Ejlli, Damian
PY - 2018/2/19
Y1 - 2018/2/19
N2 - The vacuum polarization in an external gravitational field due to one loop electron-positron pair and one loop millicharged fermion-antifermion pair is studied. Considering the propagation of electromagnetic (EM) radiation and gravitational waves (GWs) in an expanding universe, it is shown that by taking into account QED effects in curved spacetime, the propagation velocity of photons is superluminal and can exceed that of gravitons. We apply these results to the case of the GW170817 event detected by LIGO. If the EM radiation and GWs are emitted either simultaneously or with a time difference from the same source, it is shown that the EM radiation while propagating with superluminal velocity, would be detected either in advance or in delay with respect to GW depending on the ratio of millicharged fermion relative charge to mass /m.
AB - The vacuum polarization in an external gravitational field due to one loop electron-positron pair and one loop millicharged fermion-antifermion pair is studied. Considering the propagation of electromagnetic (EM) radiation and gravitational waves (GWs) in an expanding universe, it is shown that by taking into account QED effects in curved spacetime, the propagation velocity of photons is superluminal and can exceed that of gravitons. We apply these results to the case of the GW170817 event detected by LIGO. If the EM radiation and GWs are emitted either simultaneously or with a time difference from the same source, it is shown that the EM radiation while propagating with superluminal velocity, would be detected either in advance or in delay with respect to GW depending on the ratio of millicharged fermion relative charge to mass /m.
KW - gravitational wave detectors
KW - gravitational waves / sources
KW - particle physics - cosmology connection
KW - quantum field theory on curved space
KW - VELOCITY
KW - GRAVITATIONAL-FIELD
UR - http://www.scopus.com/inward/record.url?scp=85043578341&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2018/02/035
DO - 10.1088/1475-7516/2018/02/035
M3 - Article
AN - SCOPUS:85043578341
VL - 2018
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 2
M1 - 035
ER -
ID: 12079604