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Lorentz violating severely restricted: Mqg/Mplank > 1200

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MTd2
#199
Aug26-09, 02:20 PM
PF Gold
P: 1,963
Hi Micha, look at this:

http://backreaction.blogspot.com/200...grb090510.html

At 12:06 PM, August 25, 2009, Daniel de Franša MTd2 said...
You mean, the linear dispertion was not ruled out?

At 12:25 PM, August 25, 2009, Lee Smolin said...
Dear Daniel de Franša MTd2,

This is a key question which was covered in many places, for example my paper with Amelino-Camelia or my post above. See those for details.

The linear correction is parity odd in the case of Lorentz symmetry breaking and parity even in the case of DSR. The former is ruled out by several orders of magnitude because it leads to rotations of planes of polarization, see the reference by Gleiser and Kozemeh I mentioned above. The latter, DSR, parity even case is not ruled out, although further observations by Fermi may be able to do that.

The distinction between broken and deformed lorentz invariance is a key point in this whole discussion.

Thanks,

Lee

Thanks,

Lee
Micha
#200
Aug26-09, 02:26 PM
P: 145
Yes I read it.

When I read your discussion of the error function, I just thought, that I remind people of the Taylor expansion. It is a trivial point of course.


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