TY - JOUR
T1 - It is hard to learn how gravity and electromagnetism couple
AU - Chu, Yi Zen
AU - Jacobs, David M.
AU - Ng, Yifung
AU - Starkman, Glenn D.
PY - 2010/9/16
Y1 - 2010/9/16
N2 - We construct the most general effective Lagrangian coupling gravity and electromagnetism up to mass dimension 6 by enumerating all possible nonminimal coupling terms respecting both diffeomorphism and gauge invariance. In all, there are only two unique terms after field redefinitions: one is known to arise from loop effects in QED, while the other is a parity-violating term which may be generated by weak interactions within the standard model of particle physics. We show that neither the cosmological propagation of light nor, contrary to earlier claims, solar system tests of general relativity are useful probes of these terms. These nonminimal couplings of gravity and electromagnetism may remain a mystery for the foreseeable future.
AB - We construct the most general effective Lagrangian coupling gravity and electromagnetism up to mass dimension 6 by enumerating all possible nonminimal coupling terms respecting both diffeomorphism and gauge invariance. In all, there are only two unique terms after field redefinitions: one is known to arise from loop effects in QED, while the other is a parity-violating term which may be generated by weak interactions within the standard model of particle physics. We show that neither the cosmological propagation of light nor, contrary to earlier claims, solar system tests of general relativity are useful probes of these terms. These nonminimal couplings of gravity and electromagnetism may remain a mystery for the foreseeable future.
UR - http://www.scopus.com/inward/record.url?scp=78650967861&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.82.064022
DO - 10.1103/PhysRevD.82.064022
M3 - 期刊論文
AN - SCOPUS:78650967861
SN - 1550-7998
VL - 82
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 6
M1 - 064022
ER -