Linked Questions

8
votes
3answers
178 views

How do we know that spacetime is uncountable/continuous/etc.?

Every major theory in physics - from classical dynamics, to quantum mechanics, to general relativity - makes assumptions about the structure of spacetime. Among the most common assumptions are that ...
-2
votes
3answers
148 views

Calculus shouldn't work for describing physics [duplicate]

I am not crazy. Hear me out. I am not from a physics background but from maths. I have a really weird question in physics that is making me lose sleep. How can calculus describe physics? How is it ...
1
vote
1answer
68 views

What's need of infinite divisibility in our mathematical calculations, if Planck length/time is smallest value? [duplicate]

Let's assume if in reality, Planck's length is the smallest possible length and Planck's time is smallest possible time. Do we still need infinite divisibility of length or any quantity in our ...
1
vote
0answers
46 views

Does the Planck length imply that the smallest different between any two wavelengths must also have a limit?

I was looking at a video called How Hot Can It Get, and at 7:08, the host Michael states that if an object were to reach a temperature of $1.41 \times 10^{32}$ K (planck temperature), the ...
1
vote
0answers
37 views

Does having a minimum length in space violate Lorentz invariance? [duplicate]

I’m trying to understand different approaches to quantum gravity. One involves quantising space and time themselves, which i believe can result in there being a minimum possible length and time ...
0
votes
1answer
89 views

Are all lengths multiples of the Planck length? [duplicate]

If the Planck length is the smallest unit of length that has any physical meaning then is it true to think that all the lengths are multiple of the Planck length?
0
votes
0answers
37 views

Can a region of space-time be viewed as a particle with properties of it's own? [duplicate]

Can a piece of space-time having 3 spacial dimensions and 1 dimension of time be viewed as a particle? Could this piece of space-time have properties of its own (mass, spin, charge) independent of ...
0
votes
3answers
313 views

Can anyone explain the Planck area?

First of all, I am not an expert. I was reading about the holographic principle and came across the Planck area. It says that Planck area is the square of Planck length and there were some pictures ...
0
votes
0answers
23 views

Update: Does the Planck scale imply that spacetime is discrete? [duplicate]

This question has already been asked Does the Planck scale imply that spacetime is discrete? however I'm wondering if there has been any change in the community since it was asked roughly 8 years ...
1
vote
1answer
125 views

Is space continuous? [duplicate]

Take a particle, it has a position $(x, y, z)$ maybe it is $(0.231, 8.962, 10.567)$. Is there a maximum precision to this? Is the space discrete or continuous? If it is discrete, how thin the ...
2
votes
1answer
60 views

Minimal Requirements for Space and Time

I read recently that to consider the Planck length of less than 1.6 x 10 exp -34 meters the smallest unit that can manifest 4 coordinate space time to be incorrect in its interpretation. The reason ...
1
vote
0answers
186 views

Is the universe a lattice?

My understanding is that cause and effect create a partial order of events in the universe (and that relatively prevents anything stronger). My understanding is also that it’s generally useless to ...
5
votes
2answers
116 views

Is the space of possible positions of a particle in QM discrete?

I recently updated my understanding about quantum mechanics from popular science level to basic undergraduate level. What surprised me is that for the quantum state of a particle, the wave function ...
-1
votes
1answer
620 views

Classical Mechanics: Continuous or Discrete universe? [duplicate]

The question of the "continuous" or "discrete" nature of the universe is the subject of diatribe among the greatest physicists in the world. I would like to discuss the same topic, but asking a ...
-3
votes
1answer
177 views

Is space-time quantised? [duplicate]

i was reading and a question popped into my head and i could not find the answer anywhere if photon destruction is instantaneous doesn't it mean that space-time is quantised? here is my problem: ...

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