Age of Universe: Defining Time from Big Bang

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SUMMARY

The discussion centers on the challenge of defining a universal time elapsed since the Big Bang, given that the universe is composed of spacetime and time is experienced locally. Marcus provides a comprehensive answer in the cosmology FAQ, addressing the complexities of measuring time on a cosmic scale. The conversation highlights the philosophical and scientific implications of time measurement in cosmology.

PREREQUISITES
  • Understanding of spacetime concepts in physics
  • Familiarity with cosmology and the Big Bang theory
  • Basic knowledge of local versus universal time
  • Awareness of the Physics Forums community and resources
NEXT STEPS
  • Read Marcus's detailed explanation in the cosmology FAQ on Physics Forums
  • Explore the implications of local time versus universal time in cosmology
  • Investigate the role of spacetime in modern physics
  • Study the methodologies used in measuring cosmic time
USEFUL FOR

Astronomers, physicists, and students of cosmology seeking to understand the complexities of time measurement in the universe.

Chewz
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I may be simplifying but if the universe is spacetime and time is local how can you define a time elapsed from the big bang for the whole Universe?
 
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Hi, Chewz,

Welcome to PF!

That's a good question, and Marcus has written up a nice answer to it as part of our cosmology FAQ: https://www.physicsforums.com/showpost.php?p=3332515&postcount=7

-Ben
 

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