Unraveling the Mystery of Photon Mass and Its Interplay with Gravity

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Discussion Overview

The discussion centers around the nature of photons, their mass, and how they interact with gravity and spacetime. Participants explore theoretical implications, the relationship between mass and gravity, and the conceptual understanding of spacetime, with a focus on both physical and philosophical perspectives.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants argue that if photons are affected by gravity, they must possess some form of mass or gravitational property, challenging the notion that massless particles cannot be influenced by gravity.
  • Others propose that spacetime itself must have physical properties or forces that allow it to affect physical objects, including massless particles like photons.
  • There are claims that spacetime is not a force or wave, leading to questions about how it can influence physical entities if it lacks physical properties.
  • One participant suggests that the curvature of spacetime could be calculated based on the mass of an object and the distance of a photon from it, implying a relationship between photon behavior and gravitational effects.
  • Some contributions reflect skepticism about the reality of spacetime and time itself, asserting that these concepts may not have a tangible existence.
  • There is mention of the relationship between electromagnetic waves and gravity, with questions about how gravity might affect electromagnetic phenomena.
  • A later reply discusses the uncertainty principle and proposes a new theory that attempts to reconcile various concepts, though it remains in development.

Areas of Agreement / Disagreement

Participants express a range of competing views regarding the nature of photons, mass, and spacetime. There is no consensus on these topics, and the discussion remains unresolved with multiple interpretations and hypotheses presented.

Contextual Notes

Some arguments rely on assumptions about the nature of spacetime and its interaction with massless particles, while others question the validity of spacetime as a concept. The discussion includes unresolved mathematical and conceptual challenges regarding the relationship between gravity, mass, and the behavior of photons.

Who May Find This Useful

Individuals interested in theoretical physics, the nature of light and gravity, and philosophical implications of scientific concepts may find this discussion relevant.

  • #31
Fair point.

If you want to measure its invariant mass, there are lots of ways particle physicists do that too

Fair point. I guess they can just count the particles; or in a different situation the two alien space beings can just count the atoms in their lumps of "mass" of the same composition. And I'm sure they'd agree that those numbers had significance. Silly me.

Your other point, well, I guess "what really happens", ie: the result of experiment is the only test we have.
 
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  • #32
The key to the why the photon can travel and be bent by gravity has nothing to do with it's mass. Because a photon has no mass. The answer is related to curvature to space-time due to light moving around an massive object. It is just following the curvature of space-time produced by the mass of a planet or star. It does not have any force, pressure, or gravity.
 
  • #33
trex1950 said:
The key to the why the photon can travel and be bent by gravity has nothing to do with it's mass. Because a photon has no mass. The answer is related to curvature to space-time due to light moving around an massive object. It is just following the curvature of space-time produced by the mass of a planet or star. It does not have any force, pressure, or gravity.

You just bumped a 5 year old thread.

Doesn't photon get bent through space due to the electrical forces acted upon it?
 
  • #34
doesn't the kinetic energy of a photon give it a "mass" if energy=mass and mass=energy?
 
  • #35
if a photon is massless like the neutrino and has not charge like the neutrino, why doesn't it penetrate matter like the neutrino?
 
  • #36
kirtg said:
if a photon is massless like the neutrino and has not charge like the neutrino, why doesn't it penetrate matter like the neutrino?

Neutrinos have mass.
 
  • #37
So if a nearly massless neutrino with no charge can penetrate matter with little likelihood of a collision, why doesn't a photon do the same thing"
 
  • #38
The photon interacts with charged particles (like the electrons in atoms) via QED (EM forces basically). Neutrinos only interact with particles via the weak force.

Photons do not have rest mass.

In general, it's better to read the faq if you have some basic misunderstandings. If you can't find the answer in the faq or a quick search, then post a new thread, don't bump a ~decade old thread (holy crap PF is ~decade old!?).
 
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