Re: How an electrostatic gravity is possible

franklinhu@xxxxxxxxx wrote:

I have been trying to figure out how to make a gravity force out of
the electrostatic force.
[snip crap]

You are an idiot - with or without your Kaluza-Klein jeans.

1. In electromagnetism like charges repel while opposite charges
attract. If you have three charges they cannot all attract each
other. (If charge 1 is positive and attracts charge 2, then charge 2
must be negative. Then what is charge 3?) The situation for gravity
is clearly different.

You can try to alter Maxwell's equations so that like charges attract.
To do so, though, you must change signs in such a way that the energy
of electromagnetic radiation comes out negative. This is a disaster
(and would be for gravity): it would allow a pair of charges or masses
to generate energy without limit by radiating away negative energy.

2. Even if you ignore the sign problem, radiation in a vector theory
is emitted at a much faster rate than in a tensor theory like general
relativity. For a pair of masses in GR, radiation depends on the rate
of change of the quadrupole moment. For a pair of charges in
Maxwell's theory, or a pair of masses in a vector theory of gravity,
the radiation rate depends on the rate of change of the (much larger)
dipole moment. This leads to predictions of gravitational radiation
that disagree severely with observed decays of binary pulsar orbits.

3. A general vector theory of gravitation involves three adjustable
parameters. These can be chosen, by hand, to predict the right
precession of Mercury's perihelion (though GR has the advantage that
no ad hoc choices are needed to get the right answer). But the
resulting vector theory predicts no bending of light in a
gravitational field, again disagreeing strongly with observation. See
Robertson and Noonan, _Relativity and Cosmology_, section 6.6.

4. In a vector theory of gravitation, the energy of the field itself
does not gravitate. (The electromagnetic analog is that the electric
field has no charge, and doesn't generate its own electric field.)
But we know from observation - by comparing the Earth's and the Moon's
motion toward the Sun - that gravitational binding energy *does*
contribute to the gravitational field.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
.

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