Photon Decoupling: Effects on Universe Expansion

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SUMMARY

The discussion centers on the phenomenon of photon decoupling and its implications for the expansion of the universe. During photon decoupling, the wavelengths of photons increased due to the expansion of space, a process known as redshift. It is established that while the universe expands, gravitationally bound systems, such as galaxies and stars, do not undergo this expansion. This distinction is crucial for understanding cosmic structures and their behavior over time.

PREREQUISITES
  • Understanding of photon decoupling
  • Familiarity with cosmic redshift
  • Knowledge of gravitationally bound systems
  • Basic concepts of universe expansion
NEXT STEPS
  • Research the mechanics of photon decoupling in cosmology
  • Explore the concept of cosmic redshift and its measurements
  • Study the properties of gravitationally bound systems in astrophysics
  • Investigate the implications of universe expansion on cosmic structures
USEFUL FOR

Astronomers, cosmologists, and physics students interested in the dynamics of the universe and the behavior of light in an expanding cosmos.

Adhruth Ganesh
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Why did the expansion of the universe cause an increase in the wavelength of the photons that existed during the time of Photon decoupling ?
Does this mean that expansion of universe stretches everything and stars that were present when the universe considerably expanded also got stretched?
 
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Gravitationally (or otherwise) bound systems do not expand.
 
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Orodruin said:
Gravitationally (or otherwise) bound systems do not expand.
Fine. Thanks.
 

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