# Gravity

(Redirected from Gravitational field)

The popular model of general relativity, as causing a flat surface like a rubber sheet to curve into a manifold is unhelpful to further progress in unifying quantum space with gravitation, since physical space fills volume, not surface area. This obvious fact is obfuscated by jargon in physics! Instead of 11 dimensional and multiple universe speculation (http://www.math.columbia.edu/~woit/blog/), consider what physics can do with experimentally-proved properties of space: real space is in physics as electric impedance (mc = 377 ohms for a vacuum, allowing radio transmission), electric permittivity, magnetic permeability (m), it forms a vacuum foam and causes particle-wave duality (Dirac space sea).

Fact 1: the big bang is receding galaxies with observable speed increasing linearly with time past, v/t = constant acceleration

Fact 2: by Newtons 2nd empirical law, F = ma, the mass of the galaxies times acceleration is outward force of the big bang

Fact 3: by Newtons 3rd empirical law, forces have equal and opposite reaction: so equal inward force is proved, thus gravity

This inward force is carried by the fabric of space around accelerating matter, so the inward pressure (force/area) gives rise to the inverse-square law of gravity (see illustrations), causing gravitation where shielded by mass (http://cdsweb.cern.ch/search.py?recid=706468&ln=en).

In many interesting situations the source of the gravitational field can be taken to be a perfect fluid. A fluid is a continuum that flows... A perfect fluid is defined as one in which all antislipping forces are zero, and the only force between neighboring fluid elements is pressure.  Bernard Schutz, General Relativity, Cambridge University Press, 1986, pp. 89-90.

The correct force of gravity is proved below: F = mMG/r2, where G = (3/4) H2/( p r local e3 ) = 0.0119H2/r local = 6.7 x 10-11 Nm2kg-2. This is not speculative: all 3 facts above are hard experimental results. Electromagnetism and nuclear forces are well-known energy exchange processes, but gravity is not.

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