Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-14
Astronomy and Astrophysics
Astrophysics
5 pages, no figures, RevTeX, submitted to ApJ Lett
Scientific paper
The recent passage of Jupiter by the quasar QSO J0842+1835 at a separation of 3.7 arcminutes on September 8, 2002, combined with recent advances in interferometric radio timing, has allowed for the first measurement of higher-order post-Newtonian terms in the Shapiro time delay which depend linearly on the velocity of the gravitating body. Claims have been made that these measurements also allow for the measurement of the propagation speed of the gravitational force. This conclusion disagrees with recent calculations done in the parameterized post-Newtonian (PPN) model, which find no dependence of the velocity-dependent terms in the time delay on the speed of gravity to the stated order. Here, to test out these claims and counterclaims, we calculate the time delay in the limit of an instantaneous gravitational force, and find that the velocity-dependent terms are in complete agreement with previous PPN calculations, with no dependence on the speed of gravity. We conclude that the speed of gravity cannot be determined by measuring these terms in the Shapiro time delay, and suggest a reason why other groups mistakenly came to the opposite conclusion.
No associations
LandOfFree
The speed of gravity has not been measured from time delays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The speed of gravity has not been measured from time delays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The speed of gravity has not been measured from time delays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-218037