# MOND : Help with fitting procedure!

1. Apr 30, 2014

### devd

I am looking for pedagogical guides to fitting rotation curves with MOdified Newtonian Gravity. I want to study how to fit the luminosity data as well as the kinematic data. I have studied some published papers on MOND fits(Sanders, Mcgaugh, blok etc). But, they are not sufficiently elaborate. Can somebody provide any links, resources that i might find useful? Thank you!

2. Apr 30, 2014

### Mordred

MOND isn't particularly supported here, simply due to our focus on main stay cosmology. In accordance to $\Lambda$CDM. You could try www.arxiv.com. I haven't looked at MOND in several years now. Not saying we only discuss LCDM, loop quantum cosmology is another popular model discussed often. MOND simply isn't too popular in forum discussions. The relativistic version of MOND theory (TeVeS), also isn't particulalry discussed. For that matter I can't recall the last discussion on (TeVeS).

Last edited: Apr 30, 2014
3. Apr 30, 2014

### devd

But, that's the scenario everywhere! that's why i've been unable to find any pedagogical material on MOND fits to rotation curves. I've surveyed the papers at arxiv.com, but they are too terse to understand sufficiently. :(

4. Apr 30, 2014

### Mordred

the only pedagogical material I usually see on it is usually comparisons between the two. Don't know what to tell you. The only help I can offer is to browse through the supportive references of the various MOND articles. MOND simply isn't in standard textbooks. So information on it is very limited. Its far easier to find materials to LQC and LCDM than MOND TeVeS etc.

here is one pedagogical view between the two, you might find supportive references from it. That's all I can recommend. MOND simply isn't popular and is falling out of favor, it was easier to find papers on it 5 to 10 years ago than it is now. Though I don't believe TeVeS ever gained much popularity. Its on the order of say Poplowskii's spin and torsion model, where he tried to do away with dark energy lol. I don't even think he's working on that model anymore

http://arxiv.org/pdf/1301.0623v2.pdf

I'll dig through my archives, I might still have one or two articles tucked away somewhere, it will take some time though I have over 100 gigs of PDF files

5. Apr 30, 2014

### Mordred

aha your in luck I did have one and found the article on arxiv for you.

The MOND Paradigm by Mordehai Milgrom

http://arxiv.org/abs/0801.3133

6. Apr 30, 2014

### Mordred

key note here, you cannot understand MOND unless you also understand the metrics used in
standard Cosmology. MOND, isn't its own set of metrics, it uses differential geometry, SR and GR just as the FRW and Einstein field equations do. It simply modifies them where needed. That's probably why you find MOND articles terse and have difficulty understanding them.

put another way you need to first understand LCDM, and all that goes with it

Last edited: Apr 30, 2014
7. Apr 30, 2014

### devd

Thanks for all the help! Much appreciated! :)

8. Apr 30, 2014

9. May 1, 2014

### Chronos

MOND is an effective theory - meaning it fits observational evidence to a limited extent. It has no substantive underlying theoretical support.

10. May 1, 2014

### Mordred

That I agree with, I always found it amusing though that some MOND metrics uses Dipolar dark matter. see the first article