Quantum fluctuations and Spacetime

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Discussion Overview

The discussion revolves around the origins of the universe, specifically the concept of quantum fluctuations and their relation to the Big Bang. Participants explore theoretical implications of spacetime and the nature of vacuum prior to the Big Bang, as well as recommendations for popular physics literature.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the nature of quantum fluctuations if there was no spacetime before the Big Bang, asking where these fluctuations would occur.
  • Another participant notes that while present-day theories explain events after the Big Bang, the specifics of the Big Bang itself remain open to various theories.
  • A third participant references Edward Tryon's work on the idea that the universe may be a vacuum fluctuation, suggesting it as a relevant source for understanding these concepts.
  • Recommendations for popular physics books are provided, including Alex Vilenkin's "Many Worlds in One" as a resource for further exploration of these ideas.

Areas of Agreement / Disagreement

Participants express differing views on the nature of spacetime and quantum fluctuations, indicating that multiple competing theories exist regarding the Big Bang and its origins.

Contextual Notes

The discussion highlights uncertainties regarding the definitions of spacetime and vacuum, as well as the assumptions underlying the theories of the Big Bang and quantum fluctuations.

Who May Find This Useful

This discussion may be of interest to those exploring cosmology, quantum physics, and the philosophical implications of the universe's origins, as well as readers seeking recommendations for popular science literature on these topics.

DonSmith
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Hi there. I am a layman, and I have a question.

As far as I have gathered, the prevalent view in cosmology is that the universe appeared as a result of the Big Bang, which in turn occurred due to expansion of singularity. Ok.

Some go further and propose that singularity appeared through quantum fluctuation. Herein lies my question. Assuming there was no spacetime 'before' the Big Bang, where did these quantum fluctuations happen? In a vacuum that preceded spacetime? I always thought that even vacuum had to be in space.

PS: since we're on the topic, I'd also appreciate if you could throw in some recommendation of a pop-physics book which deals with these questions. I have read brief history of time, long ago, but that's about it.
 
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Present day theory has a pretty good idea of what happened after the big bang. The big bang itself is still open to many theories.
 
For the origin of the quantum fluctuation universe, see Edward Tryon, "Is the Universe a Vacuum Fluctuation?" written in 1973.

For a good pop-physics book, try Alex Vilenkin's book "Many Worlds in One"
 
Thanks a lot.
 

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