Table of Contents
What is external field effect?
The external field effect This means that a subsystem can be decoupled from the larger system in which it is embedded simply by referring the motion of its constituent particles to their centre of mass; in other words, the influence of the larger system is irrelevant for the internal dynamics of the subsystem.
Is MOND relativistic?
Here I briefly review MOND as well as its implementation as a nonrelativistic modified gravity theory, AQUAL. Gravitational lensing and cosmology call for a relativistic gravity theory different from general relativity if dark matter is to be avoided.
Who modified Newton’s laws under extreme circumstances?
Only in extreme circumstances do Newton’s laws break down, and this fact was not realized until the twentieth century, when Albert Einstein’s theories of relativity once again revolutionized our view of the universe (see Chapter 22).
Can Mond explain the bullet cluster?
A famous example is the Bullet Cluster, which consists of two such colliding clusters. Observations suggest that dark matter follows the stars in these events, which have a lower total mass than the gas cloud. MOND cannot explain why that is.
What does MOND mean?
MOND
| Acronym | Definition |
|---|---|
| MOND | Modified Newtonian Dynamics (missing dark matter theory) |
| MOND | Ministry of National Defence (various nations) |
What is the external field effect of MOND theory?
One curious aspect of MOND as a theory is the External Field Effect (EFE). The modified force law depends on an absolute acceleration scale, with motion being amplified over the Newtonian expectation when the force per unit mass falls below the critical acceleration scale a 0 = 1.2 x 10 -10 m/s/s.
What is MOND’s theory of motion?
In addition, MOND made a bold prediction: the internal motions of an object in the cosmos should not only depend on the mass of the object itself, but also the gravitational pull from all other masses in the universe—called “the external field effect” (EFE).
What is the effect of Mond on EFE?
The EFE in MOND is a much subtler effect: when near a host, there is an extra source of acceleration, so a dwarf satellite is not as deep in the MOND regime as the equivalent isolated dwarf. Consequently, there is less of a boost from MOND: stars move a little slower, and conventionally one would infer a bit less dark matter.
What is the mitmond theory?
MOND theory, a counter explanation introduced by physicist Mordehai Milgrom from Weizmann Institute (Israel) in the early 1980s, says this gravitational pull exists because the rules of gravity are slightly altered.