All Questions
25
questions
-2
votes
2
answers
71
views
Shouldn't there be a gravitational field without any mass in our 3d space? [closed]
Imagine there is a Neutron star Displaced a small distance from our accessible 3d slice in the direction transverse to that 3d slice. It will bend the space around it. It will also bend the space of ...
-3
votes
5
answers
213
views
Can some regions of space (independent of size), be completely devoid of matter?
Before answering the question, keep in mind that I am a second year Biology student, with no experience in studying Physics and a very basic understanding of Mathematics. However, I have some ...
- 69
2
votes
0
answers
47
views
Mass curves spacetime. Is there any theorized "anti-mass" that counteracts this effect? [duplicate]
Things like faster-than-light travel have very good reasons for being believed theoretically impossible (e.g. they allow traveling backwards in time). Things like magnetic monopoles are seemingly ...
- 1,090
5
votes
2
answers
2k
views
Is it the mass that bends spacetime, or is it the gravity?
I had understood that mass bends spacetime and that curvature generates gravity, but I have recently read that what bends spacetime is gravity.
Which comes first? Does the mass generate gravity, and ...
- 173
0
votes
1
answer
271
views
Is mass the source of space-time?
The Einstein field equations (EFE) characterize how mass curves spacetime.
$$ R_{\mu\nu}-\frac{1}{2}g_{\mu\nu}R=\kappa T_{\mu\nu} $$
I try to understand the curvature of spacetime.
In the EFE, there ...
- 255
4
votes
4
answers
4k
views
How can time be curved?
Time isn't a physical object, but according to Einstein's theory of gravity, mass bends spacetime towards things with mass and makes them fall. How does a physical object affect something intangible?
0
votes
1
answer
113
views
What is a charge, apart from fundamental property? [duplicate]
What really a charge is apart from saying its a fundamental quantity. I mean IF in case of gravity, its curvature of spacetime due to mass so just like that can anyone explain how charge like ...
0
votes
1
answer
107
views
Black hole and white hole symmetry
NB: This question comes from an idea I had while watching this video about the video game portal and its sequel (link: https://www.youtube.com/watch?v=aj8NDOA0Sgw at 15:30 the idea of a black hole was ...
- 9
11
votes
6
answers
4k
views
If mass curves spacetime, why do planets in a vacuum follow curved paths?
Earth orbits the Sun because the Sun's mass curves spacetime. But the Sun is 150 million kilometers away from here; how can mass curve spacetime that it's not actually in? Is that a form of action at ...
- 384
-5
votes
1
answer
108
views
Negative mass as a property of space-time [closed]
What if negative mass is a property of space-time itself? We know that dark energy works against gravity and is currently expanding universe, while this expansion is increasing. Can this be because ...
- 1
0
votes
1
answer
68
views
What determines intensity + range of a gravity field?
Related questions..
How does the Sun's gravity extend out millions of miles to influence the far reaches of our solar system?
Reference: movie - "Interstellar", 2014 Nolan) / How does a ship ...
- 55
2
votes
3
answers
2k
views
How to visualize spacetime curvature? [duplicate]
I find it very difficult to visualize spacetime curvature in my mind. When I look at the depiction like the one below it doesn't make much sense to me, instead, it is making it more confusing for me ...
- 555
1
vote
3
answers
65
views
How similarly are light and matter affected by gravity?
For a path of travel in a shape that is straight before it curves, if the curvature of the path is attributable to gravitational force, what additional information (if any) would be capable of ...
- 181
0
votes
1
answer
2k
views
Is it possible to bend space 'upwards'? [duplicate]
According to the theory of general relativity 'space' can be bend like a fabric.
Objects with a lot of mass bend spacetime like a well or a bowling ball on a stretched blanket.
It (images) always look ...
2
votes
3
answers
327
views
Do shapes of matter affect space-time distortion?
We know heavy objects bend space-time, but does the curvature only depends on the mass? Or different shapes bend space time differently?
- 121