How is light affected by the gravity of a black hole?

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Discussion Overview

The discussion centers on the interaction between light and the gravitational field of a black hole, specifically addressing how massless photons are affected by gravity. The scope includes conceptual understanding within the framework of general relativity.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions how massless photons can be influenced by the gravity of a black hole, seeking clarification on the nature of gravity and mass.
  • Another participant explains that, according to general relativity, gravity arises from the curvature of spacetime caused by energy, momentum, and pressure, which includes light itself.
  • A third participant references existing FAQs on the topic, indicating that this question is frequently discussed.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as it includes a question about the fundamental nature of gravity and light, with varying levels of understanding expressed by participants.

Contextual Notes

The discussion highlights the complexity of the relationship between massless particles and gravitational fields, with assumptions about the nature of gravity and spacetime curvature remaining implicit.

Oliver3.141
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Hello! I am new to this forum, but I'll give it a shot.
It is my understanding that photons have no mass- but that light is still pulled by the gravity of a black hole. How can something without a mass, and therefore, gravity, be pulled by the gravity of another object? Any insight would be appreciated. I am still just beginning in my physics education, so please correct any errors I have made.
 
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Hi Oliver3.141 welcome to PF,

In general relativity (the theory that describes this) gravity comes from the fact that energy and momentum and pressure all curve spacetime. Light travels through spacetime, so its path can be influenced by gravity. Also, light has energy and momentum and pressure, so it can produce gravity too.
 
Thank you for your input! :)
 

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