How do we know there is a timespace fabric?

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In summary, two magnetic objects interact due to their magnetic fields, not by altering an existing magnetic field. The theory of spacetime proposes that mass bends and curves the fabric of spacetime, but it is questioned if each object has its own spacetime and interacts with others. Light is believed to be massless and bends around gravitational fields due to curved spacetime, rather than directly interacting with the field. To learn more about this topic, visit the Relativity FAQ subforum on Physics Forums.
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Vierstein
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When 2 magentic objects interact with each other, it is because they interact with each others magnetic field, not because their presence alters an existing magnetic field.

The way I understood spacetime, the theory goes that a spacetime fabric stretches throughout the known universe and mass bends and curves it. How do we know that is the case? Couldnt it be that there is no such thing as a spacetime fabric and that each object comes with its own spacetime and interacts with the spacetime of other objects?

Does light have Mass and is therefore affected by gravity in the same way a rock and planet is affected, or is light 100% massless and therefore if we observe light bending around a gravitational field, we know it is because it follow the curved spacetime and not because it ineracts with the gravitational field as such, because light is massless?
 
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Vierstein said:
Does light have Mass and is therefore affected by gravity in the same way a rock and planet is affected, or is light 100% massless and therefore if we observe light bending around a gravitational field, we know it is because it follow the curved spacetime and not because it ineracts with the gravitational field as such, because light is massless?

Please read the Relativity FAQ subforum:

https://www.physicsforums.com/forumdisplay.php?f=210 [Broken]

Zz.
 
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1. How do we know that time and space are connected?

Through the study of physics and the laws of gravity, scientists have observed that time and space are interconnected. This was first theorized by Albert Einstein in his theory of general relativity, which states that space and time are two components of a single fabric called spacetime. This has been further supported by numerous experiments and observations, such as the bending of light around massive objects due to the curvature of spacetime.

2. What evidence supports the existence of a timespace fabric?

Aside from Einstein's theory of general relativity, there are several other pieces of evidence that support the existence of a timespace fabric. One of the most compelling is the observation of gravitational waves, which are ripples in spacetime caused by the collision of massive objects like black holes. This phenomenon can only be explained by the presence of a fabric that can be affected and distorted by these massive objects.

3. Can we physically observe the timespace fabric?

No, we cannot physically observe the timespace fabric as it is a theoretical construct. However, we can observe its effects through various experiments and observations, such as the bending of light and the existence of gravitational waves. We can also use mathematical models and equations to study the properties and behavior of this fabric.

4. How does the timespace fabric affect our daily lives?

The timespace fabric plays a crucial role in our daily lives, even though we may not realize it. Without it, the laws of gravity would not function as they do, and the universe would be a very different place. Our understanding of time and space, as well as our ability to navigate and communicate using GPS technology, also relies on the existence of this fabric.

5. Is there any ongoing research on the timespace fabric?

Yes, there is ongoing research and exploration into the nature of the timespace fabric. Scientists are continually trying to understand its properties and how it may be connected to other fundamental forces in the universe, such as the strong and weak nuclear forces. This research can help us gain a deeper understanding of the universe and potentially lead to new technologies and advancements in our understanding of time and space.

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