Basic question about spacetime and matter

In summary, in special relativity, space-time is the background in which matter exists, while in general relativity, it is both a background and is affected by the presence of matter. It is not the matter itself, but is influenced by it similar to how electromagnetic fields are influenced by charges.
  • #1
Watari
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I'm trying to understand the concepts of physics, but there's one thing I don't fully get...
If there is some matter with a spatial and temporal coordinate, let's say coordinate X, is the matter "in" that time and place, or "is" the matter that time and place?
In other words, does space-time refer to the medium in which matter exists, or does it refer to the matter itself that exists there and then? Is matter part of space-time or is it something separate that is inside space-time?
 
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  • #2
In special relativity, space-time is the background in which matter exists. In general relativity, it is no longer simply a background, but is also affected by the presence of matter. This does not mean that it is the matter, just that it is affected by it just as electromagnetic fields are influenced by the presence of charges.
 

1. What is spacetime?

Spacetime is a concept that combines the three dimensions of space (length, width, and height) with the dimension of time. It is often described as the fabric of the universe in which all matter and energy exist and interact.

2. How does spacetime affect matter?

Spacetime is affected by matter and energy, and in turn, it affects the behavior and movement of matter. The presence of matter and energy creates distortions in spacetime, which we experience as gravity. This is described by Einstein's theory of general relativity.

3. What is the relationship between matter and spacetime?

Matter and spacetime are closely intertwined. Matter exists within spacetime and its presence causes distortions in the fabric of spacetime. At the same time, spacetime affects the behavior of matter through gravity. This relationship is described by Einstein's theory of general relativity.

4. Can spacetime be manipulated?

According to current scientific understanding, spacetime cannot be manipulated. However, our understanding of the universe is constantly evolving, and it is possible that in the future, we may find ways to manipulate spacetime.

5. How does the concept of spacetime impact our understanding of the universe?

The concept of spacetime has greatly impacted our understanding of the universe. It has allowed us to explain how gravity works and how matter and energy interact with each other. It also plays a crucial role in our current understanding of the origin and evolution of the universe.

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