What's Dirac's Large Number Hypothesis ?

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Dirac's Large Number Hypothesis posits a relationship between the electrostatic and gravitational forces acting on particles, suggesting that their ratio is comparable to the ratio of the universe's size to that of an electron, approximately 10^39. This hypothesis implies that the gravitational acceleration of a mass can be equated to centripetal acceleration, linking mass to a large number product with circular motion radius. The concept raises questions about the finite 'Horizon' of particles and their awareness of the universe's size in relation to themselves. The observable universe is estimated to be about 10 billion light-years across, although its actual volume may be infinite. Overall, Dirac's hypothesis invites deeper exploration into the fundamental connections between particle physics and cosmology.
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What's Dirac's Large Number Hypothesis ?

In 1938, Dirac noted that the ratio of the electrostatic force between and electron and a proton to their gravitational attraction was approximately equal to the ratio of the size of the universe to the size of an electron )10^{-20} cm.

\frac{F_{elec}}{F_{grav}} \sim \frac{Size_u}{Size_e} \sim 10^{39}

If we equate the gravitational acceleration of some mass, m, to the centripetal acceleration which depends on the velocity of this mass and as this velocity approaches the speed of light in vacuum then this mass is related to a large number product with radius of circular motion.

m = \left( \frac{c^2}{G} \right) r
 
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Could be that everything has a wavefunction limit, every particle has a finite 'Horizon', the limit of which is scale dependant?

The size 'apparent', of the Universe is not fully known. therefore the any ratio of Universe size must be governed by an actual particle, not by the actual Universe.

Particles may know the size of the Universe in relation to themselves?
 
Olias said:
The size 'apparent', of the Universe is not fully known.

Based on the large number hypothesis, the size of the universe is roughly 10 billions light-years across. What is the corresponding increase in distance for a degree decrease in temperature?
 
size considerations concern only the observable universe- the actual volume is almost certainly infinite/transfinite based on all the evidence we have-


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The equation m = \left( \frac{c^2}{G} \right) r implies that r is equal to 1/2 the Schwarzschild radius, R.

R = \frac{2 G m}{c^2}

The factor

\left( \frac{2 G}{c^2} \right)

is a very small number.
 
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