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Does 1 Plank Time + 1 Plank Time = 2 Plank time?

Does 1 Plank length + 1 Plank length = 2 Plankies?

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- #1

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Does 1 Plank Time + 1 Plank Time = 2 Plank time?

Does 1 Plank length + 1 Plank length = 2 Plankies?

- #2

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Those values, as of now, are useful for considering where classical physics breaks down, but they're not yet the basis of any accepted quantum theory of spacetime since there is none. :)

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Alfi

Quarks are HUge ! :)

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Quarks are HUge ! :)

How big are quarks?

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Planck time and Planck length are just convenient (or inconvenient) sizes that imply no fixed discrete values or limits.

Does 1 Plank Time + 1 Plank Time = 2 Plank time?

Does 1 Plank length + 1 Plank length = 2 Plankies?

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- #7

nrqed

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Does 1 Plank Time + 1 Plank Time = 2 Plank time?

Does 1 Plank length + 1 Plank length = 2 Plankies?

In themselves, Planck units are just that: units!!

What you are asking is exactly the same as asking "Does one second + one second

= 2 seconds?" Of course!! But so what?

Now, some believe that the Planck units also represent the smallest allowed units of time, space, energy. But that's a whole different issue and it is speculative.

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If the smallest possible distance between two objects is the PL, that's all well and good, but can the objects be 1.5 PL's apart? No current theory says they cannot, hence the "grid" analogy doesn't work.

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LURCH

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- #11

xantox

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Doesn't this digitize the Universe?

Well, I took the op's question to mean is spacetime divided into pixels like a computer momitor on the order of the Planck scale?

The answer is no : this does not imply that spacetime must be a "chessboard". It may be for example a "quantum chessboard", which is entirely different. As a proof, one may show a theory implying the opposite conclusion, I would suggest for that Wheeler-DeWitt cosmology, where the fundamental Planck length coexists peacefully with continuous space and time.

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- #13

xantox

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It is not known, but it may well be that the Planck scale is invariant. If that was the case, then special relativity should be either modified at this scale (eg DSR, controversial)A very basic question about planck length (and time). Are these universal constants like the speed of light which appear the same in all inertial frames of reference

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Thanks, I will check out the paper.

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