space/time Definition and 26 Threads

Quantum decoherence. and the emergence of continuous space/time and gravity In another forum I have experienced a lot of combative dialogue asserting that continuous time/space is a property of the smallest Quantum scale. My present knowledge indicates this not true, and that the goal of the...

Thought experiment for discussion: You have a sealed transparent container with a "perfect vacuum" inside of it. 1) List what is inside of the "empty" container. 2) Explain how you might go about expelling EVERYTHING from the container.

Something that's been bugging me, but unable to find an answer for.. The speed of light (in a vacuum) is absolute, well not really, its relative to the space/time its in. ie. The distant galaxies are moving away from us, but their local light speed is relative to their space/time. So since...

Hi, I've heard and read that if someone was to fall towards a black hole, say feet first, they would undergo spaghettification at a certain distance, as the gravity at their feet would be much greater than the gravity at their head, and their body wouldn't be able to reisist the pulling effect...

All over the news we see the results of the recent detection of gravity waves from the early universe. Which got me wondering: The early universe was much more dense than at the present. It therefore seems that spacetime was much more curved than it is, on average, today. Is this...

Perhaps I am red-shifted, but I just saw a video demonstrating space/time as a loaf of bread and depending on how it is "sliced" an observer would see different times across space. I am having a hard time wrapping my head around this theory. I can see how an observer from afar would see my past...

I started general last year and I was wondering why space/time does not cause fricton. Since it has such an effect on large bodies such as our solar system that occupy space in it and with the cassamir effect we know a vacuum can interact with matter under the right conditions. It just seems...

as title.. are there any books with recent info re. current thinking about space/time..origin, structure etc... cheers

Hey everyone, First off I am not a physics major or a math guru. Physics has always been some thing that I have been interested in though. Physical science and the way things work has always interested me. I mention this, because I do not want to come off sounding like an idiot. I know most...

Some of my thoughts on space theory. I see many similarities between space/time and water. Just how they both move and flow. Only one thing is faster than light and that is the expansion of space/time it self. We have discovered that space is expanding faster and faster. This is the reason why...

I just read an amazing book called "The Existence of Space and Time" by Ian Hinckfuss (Oxford Press, 1975). Philosophy of physics behind space and time. It is also somewhat covertly about relativity. Very short, very readable (based on lectures given), super clear. It also has very nice...

as predicted by red shift's measurement the galaxies seems to be going away from us how is this expansion be seen in quantum scale?

So if space/time is a "plain"... from what i get of it, space and time is a flat surface, and the planets and what not ride along the rings of the depressions made in it. The more i'd guess "dense" a object is, the bigger the depression and the higher gravitational pull it has. Now how in the...

While watching a video on youtube about space/time, it explained space/time like a fabric with a ball on it. Rolling another ball past this first ball caused the second ball to curve. I get that part. then they said that Arthur Eddington went to test general relativity by photographing a...

https://www.physicsforums.com/showpost.php?p=3263502&postcount=94 Actually, thinking even about AdS/CFT which is commonly said to be emergent space, but not emergent time, if the bulk geometry is pseudo-Riemannian, which has multiple timelike directions at each point, shouldn't time emerge too?

Hi, Assume the following action: \int d^4 x L[\phi,A]+ \int d^4 x A_{\mu} (x) J^{\mu}(x) What are the conditions on the form of action to have space/time translational invariance for a two point function: \left\langle J_{\mu}(x) J_{\nu}(y) \right\rangle = G_{\mu \nu}(x-y)...

Please forgive my ignorance but: I am trying very hard to understand how expanding space works. The problems I have are: 1. If expanding space has enough "connection" (friction?) to pull galaxies apart then it should also have a resistance to planets in orbit, rockets continuing on their...

Hello, I've wondered about this idea before, and thought I would put this together and get some opinions. When it comes to electricity and magnetism, electricity can generate magnetism, and a moving magnet can generate an electric current. When it comes to mass, gravity, and space/time...

I'm reading GR on http://www.bartleby.com/173/29.html" quoting "Hereupon we introduce a hypothesis: that the influence of the gravitational field on measuring-rods, clocks and freely-moving material points continues to take place according to the same laws, even in the case when the...

Okay, I am really interested in relativity, but very ignorant in it also. I already know you would divide regular space/time by √(1 - rs/r) rs = schwarzschilds radius r = radius of object from center of mass How would we define regular space/time in an equation? What units or...

This may sound silly and completely wrong but: Could space/time and gravity be due to entanglement of atoms all pulling on each other? and the same theory for dark matter? This would also suggest why some stars have greater gravitation due to the nuclear fusion which may cause more entanglement.

Does any theory explain all these dualities: Wave/Particle Duality, Space/Time Duality, and Energy/Mass Duality. Does ST or LQG account for all these dualities? What I mean is, can ST or LQG show that these dualities are unified by some deeper physical model? Can any theory show that...

I’m trying to think of an easier way to describe how space and time will warp with velocity. This is only an analogy and since I’m not a physicist or mathematician I don’t have the ability to compare the resulting equations to Einstein’s theory. I am not trying to disprove or refute anyone’s...

Hi all, Is this a valid view of space/time curvature. The path of an object under influence of a force has a curved trajectory in inertial space/time. Therefore, the inertial axes appear curved to an observer traveling on the curved trajectory. In the same way, an observer in a...

Can we say that non-linear fabric of space/time (n_Dim fabric that is curved toward n+1_Dim) is an anti-entropic zone? And if so, can we understand life phenomena as an anti-entropic zone that can duplicate itself?

In this theory a theoretical model is constructed for observation. (This is the first of a series) A: Space devoid of matter. B: Matter devoid of space. C: Space and Matter. In reply to "A" Is absolute space possible, a void with non-existing matter? has it been proven? can it...