Red shift, gravity, and dark energy.

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Discussion Overview

The discussion centers around the relationship between redshift, gravity, and dark energy, exploring how the transformation of matter into light energy within stars might affect gravitational interactions between galaxies. Participants examine the implications of energy dilution due to cosmic expansion and its potential connection to the observed acceleration attributed to dark energy.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants propose that as matter is transformed into light energy within stars, the associated gravity is also transformed, potentially weakening gravitational bonds between galaxies due to energy dilution from redshift.
  • Others argue that dark energy acceleration is not a result of weaker gravity but rather an antigravity effect, challenging the initial premise of energy dilution weakening gravitational bonds.
  • A participant questions the concept of energy attenuation as a result of frame-dependence in measurements, suggesting a different perspective on the observed phenomena.
  • Some participants clarify that the energy emitted from stars is a direct result of nuclear reactions, asserting that the gravity of a star remains separate from the energy it emits.

Areas of Agreement / Disagreement

Participants express disagreement regarding the implications of energy dilution on gravitational interactions and the nature of dark energy. No consensus is reached on these points, with multiple competing views presented.

Contextual Notes

Limitations include the dependence on definitions of energy and gravity, as well as unresolved aspects of the relationship between redshift and gravitational effects. The discussion does not resolve these complexities.

Sci1
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When matter is transformed into light energy within a star, the gravity associated with the matter is now associated with the light's energy. As space expands, the redshift is dilluting the light's energy and reducing the gravity associated with that energy. Would the energy dillution further weaken the gravitational bonds between galaxies in addition to the expansion itself, giving the appearence of dark energy acceleration?
 
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Would the energy dillution further weaken the gravitational bonds between galaxies in addition to the expansion itself, giving the appearence of dark energy acceleration?
No. Dark Energy acceleration is not weaker gravity, it's antigravity. Have a look at https://www.physicsforums.com/showthread.php?t=415607".
 
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Sci1 said:
When matter is transformed into light energy within a star, the gravity associated with the matter is now associated with the light's energy.
Nope, doesn't work this way. The energy emitted as light from a star stems directly from the nuclear reaction at its core. Except for brown dwarfs, stars are stable objects which do not collapse under gravity for the majority of their life cycle. The gravity of a star is entirely separate.

Sci1 said:
As space expands, the redshift is dilluting the light's energy and reducing the gravity associated with that energy. Would the energy dillution further weaken the gravitational bonds between galaxies in addition to the expansion itself, giving the appearence of dark energy acceleration?
Nope.
 
This is a result of frame-dependence in the measurement which leads to the appearance of energy attenuation, right?
 
Chalnoth said:
Nope, doesn't work this way. The energy emitted as light from a star stems directly from the nuclear reaction at its core. Except for brown dwarfs, stars are stable objects which do not collapse under gravity for the majority of their life cycle. The gravity of a star is entirely separate.

Chal, I am going to post another topic on this to better understand.
 

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