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Another "dark" horse in the MOND race
I'm glad there are several competing alternatives to dark matter.
Bekenstein's TeVeS doesn't have the field to itself.
this appeared today:
http://arxiv.org/abs/astro-ph/0605322
Dark energy, MOND and sub-millimeter tests of gravity
I. Navarro, K. Van Acoleyen
6 pages, to appear in proceedings of the 51st Rencontres de Moriond
"We consider modifications of General Relativity obtained by adding the logarithm of some curvature invariants to the Einstein-Hilbert action. These non-linear actions can explain the late-time acceleration of the universe giving an expansion history that differs from that of a pure cosmological constant. We show that they also modify the Newtonian potential below a fixed acceleration scale given by the late-time Hubble constant times the speed of light. This is exactly what is required in MOND, a phenomenological modification of the Newtonian potential that is capable of explaining galactic rotation curves without the need to introduce dark matter. We show that this kind of modification also predicts short distance deviations of Newton's law at the sub-mm scale and an anomalous shift in the precession of the Moon's orbit around the Earth, both effects of a size that is less than an order of magnitude below current bounds."
Ignacio Navarro is at Cambridge----basically the same bunch as Daniele Oriti: the DAMPT
Navarro and van Acoleyen have a bid to
1. replace Lambda or dark energy
2. replace dark matter and get a better fit to the rotation curves
3. achieve rapid testability---falsification attainable with only a factor of 10 improvement in the accuracy of measurements that are already made
sounds good. the kind of thing it is nice when theorists come up with.
maybe it will be shot down. and maybe not. if it is not then I would guess that someone at
Perimeter will try ways to wangle those effects using a more fundamental model of spacetime
I'm glad there are several competing alternatives to dark matter.
Bekenstein's TeVeS doesn't have the field to itself.
this appeared today:
http://arxiv.org/abs/astro-ph/0605322
Dark energy, MOND and sub-millimeter tests of gravity
I. Navarro, K. Van Acoleyen
6 pages, to appear in proceedings of the 51st Rencontres de Moriond
"We consider modifications of General Relativity obtained by adding the logarithm of some curvature invariants to the Einstein-Hilbert action. These non-linear actions can explain the late-time acceleration of the universe giving an expansion history that differs from that of a pure cosmological constant. We show that they also modify the Newtonian potential below a fixed acceleration scale given by the late-time Hubble constant times the speed of light. This is exactly what is required in MOND, a phenomenological modification of the Newtonian potential that is capable of explaining galactic rotation curves without the need to introduce dark matter. We show that this kind of modification also predicts short distance deviations of Newton's law at the sub-mm scale and an anomalous shift in the precession of the Moon's orbit around the Earth, both effects of a size that is less than an order of magnitude below current bounds."
Ignacio Navarro is at Cambridge----basically the same bunch as Daniele Oriti: the DAMPT
Navarro and van Acoleyen have a bid to
1. replace Lambda or dark energy
2. replace dark matter and get a better fit to the rotation curves
3. achieve rapid testability---falsification attainable with only a factor of 10 improvement in the accuracy of measurements that are already made
sounds good. the kind of thing it is nice when theorists come up with.
maybe it will be shot down. and maybe not. if it is not then I would guess that someone at
Perimeter will try ways to wangle those effects using a more fundamental model of spacetime
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