|Apr23-12, 05:07 PM||#1|
Do theories of quantum gravity require that space-time is a lattice?
Do theories of quantum gravity require that space-time is a lattice instead of a continuum?
I guess this question has been addressed elsewhere, but I would appreciate hearing different points of view. Please dummy down the responses so a philosopher can understand it.
|Apr24-12, 08:03 PM||#2|
James, quantum gravity strongly implies a discrete spacetime. First, look at black hole thermodynamics. Specifically, a region has what is called a Bekenstein bound - a limit to the amount of information a region can contain, a maximum density. Trying to exceed this density will simply result in the growth of the event horizon around this region. Next, look at LQG, which is based purely around a dicrete spacetime, no question there. Finally, M-theroy also implies a discrete spacetime - without getting into detail, it breaks strings down into discrete 'string bits'. I see no possible way that spacetime couldn't be discrete on the planck scale.
|Apr26-12, 04:22 PM||#3|
See IS SPACETIME QUANTIZED here:
A different perspective:
Good discussions here:
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