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ftr
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It is said that GR in the weak field limit it produces Newtons familiar law, so why can't GR produce other formulas for "strong field" which I guess it means at short distances.
ftr said:It is said that GR in the weak field limit it produces Newtons familiar law, so why can't GR produce other formulas for "strong field" which I guess it means at short distances.
Drakkith said:What do you mean? Are you asking why you can't reduce the equations for very strong field strengths, such as near neutron stars and black holes, to simple formulas like Newton's Law of Universal Gravitation?
ftr said:why can't GR predict this
PeterDonis said:What makes you think it can't?
ftr said:It is said that GR in the weak field limit it produces Newtons familiar law, so why can't GR produce other formulas for "strong field" which I guess it means at short distances.
ftr said:it seems EQ 1 in the paper assumes the potential form, is it derivable from GR?
ftr said:it seems EQ 1 in the paper assumes the potential form, is it derivable from GR?
PeterDonis said:Standard GR is the classical limit of the field theory of a massless spin-2 gauge boson; so the potential in equation 1 in the paper would not be derivable from standard GR, but only from a variant of it that was the classical limit of the field theory of a massive spin-2 gauge boson.
ftr said:they are trying to look for things like extra dimensions and other quantum correction to classical results
ftr said:I don't know of any calculations for GR at those scales
The theory of general relativity, proposed by Albert Einstein in 1915, describes the force of gravity as a curvature of space and time caused by the presence of massive objects. It is a fundamental theory in modern physics and has been extensively tested and confirmed through various experiments and observations.
According to GR, mass causes space and time to curve, and the curvature of space and time determines how objects move in the presence of gravity. The more massive an object is, the more it will bend space and time, resulting in a stronger gravitational pull.
Yes, GR can predict the gravitational pull of any object, regardless of its mass or size. However, the strength of the gravitational pull will depend on the mass and distance of the object from the source of gravity.
GR has been proven to be extremely accurate in predicting the gravitational pull of objects. It has been tested and confirmed through various experiments and has been used to make precise calculations in fields such as astrophysics and cosmology.
While GR is a very accurate theory, it does have some limitations. It does not account for the effects of quantum mechanics, and it breaks down in extreme conditions such as at the center of a black hole. Scientists are currently working on developing a more comprehensive theory that combines GR with quantum mechanics to overcome these limitations.