Does Relativistic Mass Influence Gravity and Energy in High-Velocity Objects?

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Discussion Overview

The discussion centers on the concept of relativistic mass and its implications for gravity and energy in high-velocity objects. Participants explore theoretical questions regarding the influence of relativistic mass on gravitational attraction, the relationship between mass and energy, and the implications of collisions between objects with invariant mass.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants question whether relativistic mass affects gravitational attraction, particularly if faster-moving objects exert stronger gravitational forces.
  • There is a discussion about the increase of mass with velocity, with some participants suggesting that this increase implies a corresponding increase in gravitational influence.
  • One participant raises a query about the invariant mass of colliding objects, asking whether it is the sum of their invariant masses or their relativistic masses.
  • Some participants argue against the use of the term "relativistic mass," suggesting it can lead to misunderstandings about the nature of mass and energy in relativity.
  • There is mention of the equivalence of mass and energy, with some participants noting that the apparent increase in energy does not imply a change in the object's inner structure.
  • One participant highlights that Newton's equations may not hold in the same way when considering relativistic effects, suggesting a need for a revised understanding of mass in this context.
  • Concerns are raised about the experimental validation of claims regarding relativistic mass and its effects on gravitational attraction.
  • Some participants express confusion over the differing perspectives on relativistic mass and seek clarification on the implications of these views.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the validity or utility of the term "relativistic mass." There are competing views regarding its implications for gravity and energy, and the discussion remains unresolved on several key points.

Contextual Notes

Limitations include the dependence on definitions of mass, the assumptions regarding conservation laws, and the unresolved nature of the relationship between relativistic mass and gravitational effects. The discussion also reflects differing interpretations of historical perspectives on mass in relativity.

  • #31
Ok, more precise: The meaning of "mass" is clear for all particle physicists.
I think the same is true for nuclear physics and atomic physics and I would expect it in astronomy, too.

Any other fields which deal with relativistic effects frequently?
Solid-state physics can have very low effective electron masses, but I think those are invariant (and different from the electron energy), too.
 
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  • #32
mfb said:
Ok, more precise: The meaning of "mass" is clear for all particle physicists. [..]
That is imprecise. The different meanings of "mass" in the literature are clear for many physicists, but by far not clear to all. Some particle physicists use both meanings, just as is common for "time". It's because of unfamiliarity that erroneous statements are made of the kind that again appeared in this thread.
 
  • #33
Some particle physicists use both meanings
I never met one who called E/c^2 "mass".
I think "time" was always used as proper time (time in the frame of the particle), too. Event timestamps are in the frame of the detector, of course.
 

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