Is Quantum Space-Time a Real Possibility?

Thread starter Dryson
Start date Oct 27, 2014
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Quantum Space-time

Oct 27, 2014

Dryson

Is it possible that Quantum Space-time would exist?

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Oct 27, 2014

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Without a precise definition of "Quantum Space-time", this is impossible to answer.
For most scientific definitions, the answer is "yes" (that's why those models are studied in the first place).

Thread 'Euclidean geometry and gravity'

I asked a question here, probably over 15 years ago on entanglement and I appreciated the thoughtful answers I received back then. The intervening years haven't made me any more knowledgeable in physics, so forgive my naïveté ! If a have a piece of paper in an area of high gravity, lets say near a black hole, and I draw a triangle on this paper and 'measure' the angles of the triangle, will they add to 180 degrees? How about if I'm looking at this paper outside of the (reasonable)...

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Thread 'How is "speed of expansion" of an object defined?'

[Moderator's note: Spun off from a previous thread since this is really a separate topic.] In this regard, I think it's important to note that something can't travel faster than light, but it could expand faster than the speed of light.

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Thread 'Photon Energy Without Rest Mass – How?'

According to E = mc², energy seems to depend on rest mass. But photons have zero rest mass (m₀ = 0), and still carry energy, expressed as E = hf. How should this be understood? Does E = mc² only apply to particles with rest mass? Is there a more general form that includes massless particles like photons? Looking for clarity on how this works.

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Is Quantum Space-Time a Real Possibility?

Thread 'Euclidean geometry and gravity'

Thread 'How is "speed of expansion" of an object defined?'

Thread 'Photon Energy Without Rest Mass – How?'

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