All Questions
352
questions
-5
votes
2
answers
399
views
Is time continuous or discontinuous? [duplicate]
As I notice I sometimes feel as if time is discontinuous it’s like a comic book where each act is planned out and the main character just comes there. Please give an explanation and correct me if I am ...
- 21
0
votes
0
answers
44
views
Question: Is our Universe finite? [duplicate]
Is it at all possible to compare our three-dimensional space with the two-dimensional surface of an expanding ball where recombination-induced radiation from the point at the top of the ball travels ...
- 2,255
0
votes
1
answer
100
views
Is space build of smaller space-particles?
In atomic physics one of the most decisive proves that the objects are build of atoms is that they can be deformed and twisted. So is it not logical to believe that space itself is also build of ...
- 651
0
votes
3
answers
793
views
Why are things far away moving away faster?
This is a really dumb question. But if things farther away are red shifted more, that literally means that the further away in time, things were moving away faster, but things closer to us arent ...
- 59
-1
votes
1
answer
1k
views
Did gravity exist before the Big Bang?
Gravity is one of the biggest mysteries. It is the weakest of the 4 fundamental forces but we have no clue how it works. Einstein never was able to figure it out in his lifetime. There is evidence ...
- 129
1
vote
1
answer
142
views
If the universe is infinite, would QM allow the existence of "weird" zones? [closed]
If we suppose that the universe is spatially infinite and extends more or less homogenously in all directions without end (having similar galaxies, stars etc.), then we can assume that there is a more ...
- 416
0
votes
3
answers
66
views
Detection of Variation of CMB Radiation with Time and Space
According to the standard model of cosmology, the CMBR temperature increased as $T(z)=2.7(1+z)$ at higher redshift. Has there been any study to actually probe the variation of the CMBR with redshift, ...
- 884
3
votes
2
answers
149
views
Does spacetime bending contradict the universe following euclidean geometry?
According to experiments the universe is believed to be flat, meaning that it would follow euclidean geometry. However, is that compatible with the fact that spacetime bends due to gravity? Does ...
- 31
0
votes
1
answer
108
views
How could the concept of finite unbounded universe be compatible with the fact that there are 3 dimensions? Is the example of the balloon a bad one?
In cosmology, the current understanding is that the universe is finite while being unbounded.
To explain that, one often uses the example of the surface of a balloon: if we are on the surface of the ...
2
votes
2
answers
121
views
Is it right to assume that most physical values always drop to zero at spacial infinity?
In many parts of physics, some physical quantities are supposedly considered to go to zero at infinity. For example, in classical field theory, we often use Gauss's Law to turn volume integrals into ...
- 94
1
vote
3
answers
1k
views
Does quantum physics apply to other dimensions?
Does quantum physics apply to other dimensions? Common sense seems to dictate that in a universe with two dimensions, quantum physics wouldn't apply, because particles would be vastly different from ...
- 791
3
votes
2
answers
273
views
How can spacetime be expanding faster than the speed of light? [duplicate]
How can spacetime be expanding faster than the speed of light when the speed of light is the speed limit of the universe?
- 117
33
votes
9
answers
9k
views
Is space really expanding?
In a book called "Einstein, Relativity and Absolute Simultaneity" there was this sentence by Smith:
There is no observational evidence for a space expansion hypothesis. What is observed are ...
user311398
1
vote
0
answers
34
views
How the Big Bang/Inflation started? [duplicate]
Big Bang was the start of everything. At first, there was energy just confined to a small space. And then it expanded rapidly, which we call Inflation. But what caused this Inflation, and how that ...
- 133
8
votes
4
answers
3k
views
Confusion about the shape of the universe
From what I understood, a Universe with a positive curvature should behave like a sphere, and light will eventually reach the point where it started. Similarly to a ball, when an ant starts to walk on ...
user311398