Red shift, gravity, and dark energy.

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SUMMARY

The discussion centers on the relationship between redshift, gravity, and dark energy. Participants clarify that the energy emitted as light from stars is a result of nuclear reactions, and that the gravity associated with matter does not diminish as light energy is produced. The concept of dark energy is defined as antigravity, not a weakening of gravitational forces. The redshift phenomenon is attributed to the expansion of space, which leads to an appearance of energy attenuation, but does not weaken gravitational bonds between galaxies.

PREREQUISITES
  • Understanding of redshift and its implications in cosmology
  • Basic knowledge of nuclear reactions in stars
  • Familiarity with the concept of dark energy and its role in the universe
  • Awareness of gravitational forces and their effects on celestial bodies
NEXT STEPS
  • Research the implications of redshift in cosmological models
  • Study the nuclear fusion processes in stars and their gravitational stability
  • Explore the properties and theories surrounding dark energy and its effects on cosmic expansion
  • Investigate the concept of antigravity and its theoretical foundations in physics
USEFUL FOR

Astronomers, physicists, and students of cosmology seeking to deepen their understanding of the interplay between light, gravity, and the expansion of the universe.

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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