Can Photons be in a Stable Orbit? GR Analysis

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Thread starter Grinkle
Start date Jun 13, 2017
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Orbit Photons Stable

In summary, photons cannot be in a stable orbit around an object due to their constant speed and the effects of gravity on space-time. General Relativity explains how this behavior appears as though the photons are in orbit. There are no exceptions to this rule, but photons can be trapped in a gravitational well through gravitational lensing. Studying the behavior of photons in orbit has significance in understanding the effects of gravity on light and confirming the predictions of General Relativity, as well as practical applications in fields such as astronomy and satellite communications.

Jun 13, 2017

Grinkle

Gold Member

Does GR allow for photons to be in a stable orbit around a massive body?

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Jun 13, 2017

Grinkle

Gold Member

Never mind - found my answer. Sorry for the spam.

https://www.physicsforums.com/threads/photon-orbits.140835/

1. Can photons be in a stable orbit around an object?

No, photons cannot be in a stable orbit around an object. According to General Relativity, photons travel in a straight line at the speed of light and cannot be affected by gravitational forces to enter a stable orbit.

2. How does General Relativity explain the behavior of photons in orbit?

General Relativity explains the behavior of photons in orbit by describing how gravity affects the curvature of space-time. Photons follow this curved space-time and appear to be in orbit around an object, but they are actually traveling in a straight line.

3. Are there any exceptions to the rule that photons cannot be in a stable orbit?

No, there are no known exceptions to this rule. Photons always travel at the speed of light and cannot be affected by gravitational forces to enter a stable orbit.

4. Can a photon be trapped in a gravitational well?

Yes, a photon can appear to be trapped in a gravitational well, but it is actually following the curved space-time around the object. This phenomenon is known as gravitational lensing.

5. What is the significance of studying the behavior of photons in orbit?

Studying the behavior of photons in orbit can help us understand the effects of gravity on light and confirm the predictions of General Relativity. It also has practical applications in fields such as astronomy and satellite communications.