mond Definition and 71 Threads

The empirical MOND explanation of galactic rotation curves involves switching over in the low acceleration regime from the Newtonian acceleration Gm/r^2 to the MOND acceleration term sqrt(Gm a_0)/r. This is normally achieved using an "interpolation function" which effectively switches off one...

MOND has been one alternative to DM. It is based on modifying acceleration of F=MA. As another alternative, could the strength of the force of gravity be much weaker than expected or predicted by GR when density is low, and as strong as expected by GR when density is above a threshold?

So I was googling around and I happen to see several references to MOND theory, Modified Newtonian Dynamics. Anyway, it proposes that there is this other new constant a_{0} that is a very very very low acceleration that exists. Basically, as far as I can tell so far the whole idea is that...

http://www.nasa.gov/home/hqnews/2006/aug/HQ_M06128_dark_matter.html press conference Monday 21 August CHANDRA team has been watching the highspeed collision of two clusters of galaxies they can see the GAS of the clusters colliding and getting hot so it radiates Xrays they may have also seen...

I need some help with the formula from the MOND Theory. I just want to understand it and be able to do it myself without any help, but that just didn't happen. so i need some help from professionals. the formula is: F=mµ(a/a0)a I know that symbol in there is "Micro" (µ) but i don't know...

http://arxiv.org/abs/gr-qc/0606039 for something to gain visibility all it needs is people interested in proving or disproving it. It doesn't need people to BELIEVE it. Some PF members seem not to have heard of RELATIVISTIC MOND. Or else they may be positive that MOND does not do lensing...

Greetings, I've heard something to the effect that MOND can explain the rotation of galaxies, but the article was very fuzzy. Can someone please explain to me MOND... 1) How is MOND different from the inverse-square law? (math please) 2) What 'problems' in science does MOND...

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...

http://arxiv.org/abs/astro-ph/0601478 Modified Newtonian Dynamics, an Introductory Review Riccardo Scarpa To Appear in the proceeding of the "First crisis in cosmology" conference, published in the American Institute of Physiscs' proceedings series, Vol. 822. (includes 13 pages and 12...

there must be a lot of ways already proposed to do this. can anyone list those considered most promising? has this been the subject of a thread already today I saw this paper which claims to suggest a way to observationally distinguish MOND from DM-----to tell which is right. I think...

in case anyone is interested: http://arxiv.org/abs/astro-ph/0505017 I know Joe Silk slightly and respect him a lot. I don't know much at all about this subject (tests of MOND) but assume that this paper is of interest because Silk is so highly regarded

http://uk.arxiv.org/abs/astro-ph/0504051 But, in the other direction we have: http://uk.arxiv.org/abs/astro-ph/0503104 This involves the so called "dark galaxy" and contains the caveat that the measurements are not yet considered definitive. And, for all around MOND/TeVeS junkies...

http://arxiv.org/astro-ph/0503104 Does VIRGOHI21 Pose a Problem for MOND? Scott Funkhouser, Occidental College, Los Angeles March2005 "If the inferred parameters of the recently discovered dark galaxy VIRGOHI21 are verified then thedynamics of the body may represent a counter-example...

MOND (for modified Newtonian Dynamics) is a proposed alternative to the dark matter theory used to explain galatic dynamics that don't follow general relativity if only observed matter is taken into account. Jacob Bekenstein (whose recent paper is first listed here), in 2004, made a major...

http://xxx.lanl.gov/PS_cache/astro-ph/pdf/0404/0404117.pdf

I ran across this some time ago (probably in this forum, somewhere or other) - but I thought it was quite interesting at the time. It's one of the very few alternatives to GR that is actually inspired by considerations of actual observation. Basically, someone feels that they've discovered...

The gravitational force acting on a particle of mass m, on the surface of a sphere of radius 10^26 metres and with a mass of 10^52 kg is given by G x10^52 m / (10^26) ^ 2 The acceleration is given by G x10^52 / (10^26) ^ 2 = 10^ - 11 m/ s^2 This is the magnitude of accleration at which...

The gravitational force acting on a particle of mass m, on the surface of a sphere of radius 10^26 metres and with a mass of 10^52 kg is given by G x10^52 m / (10^26) ^ 2 The acceleration is given by G x10^52 / (10^26) ^ 2 = 10^ - 11 m/ s^2 This is the magnitude of accleration at which...

It’s interesting that MOND splits Newtonian gravity into two cases and the Modified version of Newtonain dynamics seems to happen in galaxies and clusters of galaxies with magnetic fields.What is the physical reason that MOND could be right? If we assume that there is another force interacting...

Space is filled with gravitons moving in every direction. These gravitons push masses together and cause "attraction". When gravitons approach a spiral galaxy parallel to its plane, they get pushed together and concentrated by the magnetic field lines of the galaxy. As they double their...

can someone please explain about this theory? (it's roots, what does it solve, why it's better description than the dark matter proposal). thanks in advance.