(Solved) What is special about a Planck length?

smotwan

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12 years ago

Can anyone tell me why a Planck length is "special"?

What is it based on?

Is it an absolute lower limit of how small a space can be, or can it go smaller than Planck length?

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DAV620

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12 years ago

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Tonyj9

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12 years ago

It's value (10^-35 m) was first encountered when work on the strong atomic force indicated that was the minimum length between quarks in a nucleon. Then, ta da, it showed up again in string theory as a minimum length for the strings in question. Strings can be longer, but not shorter, for the theory to work.

Some do believe the Planck Length is the smallest length space can be. That leads to the quantum space concept where space itself is granulized and those grains of space can have things happen to them... like polarization. It also leads to the WAG that the centers of black holes are not singularities which means dimensionless, but have minimums hovering around the Planck Length.

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dauterjudy938

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12 years ago

The Planck length is calculated form 3 constants: the gravitational constant G, the reduced Planck constant and the speed of light. Current physics cannot explain the significance of the Planck constant as it is calculated by the reduced Planck constant and the gravitational constant, so a theory of quantum gravity is required to explain this ans such a theory still doesn't exist. However most theories that try to explain quantum gravity consider it the smallest distance possible and that any two objects can't be less than a Planck length apart.

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