Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-01-13
Class.Quant.Grav.25:184008,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
4 Pages, no figures, Contributed to 12th Annual Gravitational Wave Data Analysis Workshop (GWDAW-12 2007): Connecting Gravitat
Scientific paper
10.1088/0264-9381/25/18/184008
We consider stable modified theories of gravity that reproduce galactic rotation curves and the observed amount of weak lensing without dark matter. In any such model gravity waves follow a different geodesic from that of other massless particles. For a specific class of models which we call "dark matter emulators," over cosmological distances this results in an easily detectable and difference between the arrival times of the pulse of gravity waves from some cosmic event and those of photons or neutrinos. For a repeat of SN 1987a (which took place in the Large Magellanic Cloud) the time lag is in the range of days. For the recent gamma ray burst, GRB 070201 (which seems to have taken place on the edge of the Andromeda galaxy) the time lag would be in the range of about two years.
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