MOND GR: Bridging the Gap Between Newtonian and General Relativity?

[quasar987]

I heard a general theory of relativity was constructed based on MOND rather than on Newton's law of gravitation. How well do the predictions of the MOND GR compare with the classical tests of GR (such as light bending)?

Basically, is it in better or worse agreement with experiment than Newtonian GR?

 

[arivero]

A related point is... can MOND adjust for the bullet cluster?

 

[ccdantas]

Bekenstein developed the GR version of MOND:

http://arxiv.org/abs/astro-ph/0403694

Can MOND take a bullet?

http://arxiv.org/abs/astro-ph/0606216

All about MOND:

http://arxiv.org/find/grp_cs,grp_ma...s,grp_q-bio,grp_stat/1/ti:+mond/0/1/0/all/0/1

 

[quasar987]

Awesome ccdantas :!)

 

[Chronos]

MOND is not dead, but does appear injured. The bullet cluster does pose a difficult [albeit not insurmountable] problem for the model. The links provided by Christina provide a broad picture of current status.

 

[arivero]

Are there other experimental counterexamples (falsations) besides the Bullet cluster?

 

[chrisina]

I am still inclined to believe that there must be something really profound behind the "empric" MOND factor a/(a^2 + a0^2)^1/2, especially taking into acount the "coincidence" that the best fit a0 (1.2*10-10 ms-2) is very close to c(lambda/3)^1/2

check :

"MOND as modified inertia" by Milgrom

http://arxiv.org/abs/astro-ph/0510117v1

really, really intriguing, don't you think so, another "numerical coincidence" ?

 

[Chronos]

It sounds suspiciously numerological to me chrisina, but, that is strictly my personal perspective - more hunch than reason. The standard model with 'dark' tweaks remains more attractive to me. Remember the atom - it's existence was postulated many centuries before is was cornered in a laboratory.

 

[chrisina]

I also prefer the "dark tweaks", (maybe I was influenced by Dark Vador too much when I was a kid... lol).
I am just very puzzled at how the curvature radius of a 4D de Sitter universe specified by the cosmological constant (3/lambda)^1/2 seems to play a very important role for the energy distribution profiles of the individual galaxies.
This requires an explanation.

 

[jgraber]

Below is a link to a recent paper about globular clusters discussing evidence favorable to MOND:

http://arxiv.org/ftp/arxiv/papers/0707/0707.2459.pdf

 

[arivero]

against mond.

http://arxiv.org/abs/0708.1080

 

[ccdantas]

The situation seems to get more and more complicated and interesting. See here:

http://egregium.wordpress.com/2007/08/23/galaxies-and-dark-matter-apart/

 

[jal]

Does this fit in with weird and interesting.
from https://www.physicsforums.com/showthread.php?t=181546
"Gaping hole found in universe"
http://arxiv.org/abs/0704.0908

 

[CarlB]

Does this fit in with weird and interesting.
from https://www.physicsforums.com/showthread.php?t=181546
"Gaping hole found in universe"
http://arxiv.org/abs/0704.0908

The MOND effect causes an increase in the gravitational strength at long distances. I suppose that an increase in the long distance gravitational strength could cause all matter to be concentrated in small regions. But I'm just guessing. This is way outside my realm of mediocrity.

 

[Chronos]

Garth is a very bright guy. He might be luring you into a serious discussion.