Could the Big Bang Allow for an Infinite Universe?

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SUMMARY

The discussion centers on the concept of the universe's finiteness in relation to the Big Bang theory. Participants assert that while the universe is expanding, it has always been finite at any given moment since its inception at t=0. The argument posits that an infinite universe is incompatible with the Big Bang model, which describes a universe that began from a singular point. However, some argue that an infinite universe could theoretically exist in a static model, separate from the Big Bang framework.

PREREQUISITES
  • Understanding of the Big Bang theory
  • Familiarity with concepts of cosmic expansion
  • Knowledge of finite versus infinite sets in mathematics
  • Basic principles of cosmology
NEXT STEPS
  • Research the implications of cosmic inflation on the universe's size
  • Explore models of static universes in cosmology
  • Study the mathematical foundations of infinite sets
  • Investigate alternative cosmological theories beyond the Big Bang
USEFUL FOR

Astronomers, cosmologists, physics students, and anyone interested in the fundamental nature of the universe and its origins.

pivoxa15
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I think I have read that the universe is or could be infinite. But that is not possible because we know that the Universe started from a Big Bang. And its size has been expanding ever since. At each point in the past through to the present, the Universe measures a finite size with 0 unit of size at t=0. Therefore the universe has always been and is to the present moment finite.

The universe might expand forever but it does not matter because at each specific time, the universe will always be of finite size hence to speak of an infinite universe is nonsense in the Big Bang model.

An infinite universe can only exist in a static, infinite universe where the universe has 'always been infinite'.
 
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