Gravity: Exploring Gravitons & Interactions with Spacetime

In summary, gravity is considered to be caused by gravitons, particles that are associated with the propagation of changes in the gravitational field. However, this is a quantum view of gravity, as in classical field theory, gravity is simply the curvature of spacetime and there are no particles involved. This is similar to how electromagnetism, a classical field theory, is described by electromagnetic waves but in the quantum view, these waves are identified as particles called photons.
  • #1
YoungDreamer
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I have a question about gravity.
Why do we think that gravity is caused by a specific particle.
Why isn't gravity considered a phenomenon related to the way matter interacts with spacetime.
 
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  • #2
YoungDreamer said:
I have a question about gravity.
Why do we think that gravity is caused by a specific particle.
Why isn't gravity considered a phenomenon related to the way matter interacts with spacetime.

So, you have to understand how field theories and their quantization works. Gravity, as a classical field theory, is well described by Einstein's theory of General Relativity. In this theory, gravity is precisely what you say -- the curvature of spacetime, there are no particles or anything else to speak of. Now, when there are changes in the gravitational field, we see these as ripples propagating in the fabric of spacetime: gravitational waves.

In electromagnetism, we have a similar situation. We have a nice electromagnetic field, but changes in that field propagate outwards as electromagnetic waves. In the quantum view of this scenario, the EM wave are identified with particles -- namely, photons. Analogously with gravity, gravitational waves are identified with particles -- gravitons.
 

Related to Gravity: Exploring Gravitons & Interactions with Spacetime

1. What is gravity?

Gravity is a natural phenomenon in which objects with mass attract each other. It is one of the four fundamental forces in the universe and is responsible for keeping planets in orbit around stars, and stars in orbit around galaxies.

2. How does gravity work?

Gravity works by the interaction of massive objects with the fabric of spacetime. When an object with mass creates a dip or curvature in spacetime, other objects with mass will be drawn towards it. This is commonly known as the "bending" of spacetime.

3. What are gravitons?

Gravitons are theoretical particles that are thought to be the carriers of the force of gravity. According to some theories, these particles are responsible for transmitting the gravitational force between objects with mass.

4. How does gravity interact with spacetime?

Gravity interacts with spacetime by creating a curvature or dip in the fabric of spacetime. This curvature is what causes objects with mass to be attracted to each other. The strength of the curvature is determined by the mass and distance between the objects.

5. Can gravity be manipulated?

At this time, there is no known way to manipulate gravity. However, scientists are continuously researching and studying the nature of gravity in hopes of one day being able to control it. Some theories suggest that by harnessing the power of gravitons, we may be able to manipulate gravity in the future.

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