How do they know what happened in the first second

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around how scientists understand the events that occurred in the first second of the universe, particularly in the context of the Big Bang theory. Participants express curiosity about the evidence and reasoning behind these claims, referencing various sources and literature.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants express skepticism about the evidence for understanding the first second of the universe, questioning how scientists arrive at their conclusions.
  • Others mention that the standard model of particle physics provides a reasonably clear picture after the first second, but becomes less clear around e-18 seconds due to extreme conditions.
  • Constraints from Big Bang Nucleosynthesis and signatures of inflation imprinted on the Cosmic Microwave Background (CMB) are cited as evidence for understanding the early universe.
  • Participants reference various books and resources, including "The First Three Minutes" by Weinberg and "The Goldilocks Enigma" by Paul Davies, as sources of information on the topic.
  • There is a suggestion that philosophical texts may not contribute to scientific understanding, emphasizing the importance of focusing on scientific literature.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the adequacy of the evidence for understanding the first second of the universe. Some accept the Big Bang theory while questioning the specifics of what happened in that time frame, indicating ongoing disagreement and uncertainty.

Contextual Notes

Participants reference various sources and personal experiences with literature, but there is no agreement on the sufficiency of these sources to explain the events of the first second. The discussion highlights the complexity and uncertainty surrounding this aspect of cosmology.

bobsmith76
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I've always wondered how they know all that stuff, you know, what happened in the first second of the universe. I've read quite a few books on the subject and I've never seen any demonstration of how they know it.
 
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Which books?
 
bobsmith76 said:
I've always wondered how they know all that stuff, you know, what happened in the first second of the universe. I've read quite a few books on the subject and I've never seen any demonstration of how they know it.
If you really want some detail, see here:
http://www.talkorigins.org/faqs/astronomy/bigbang.html
 
The picture is reasonably clear after the first second under the standard model of particle physics. It gets increasingly unclear under around e-18 seconds when everything was still fantastically hot and dense.
 
So, I ask again "which books"?
 
bobsmith76 said:
I see evidence for the BB, which I already accept, I don't see evidence for how they know what happened in the first second.
Well, there are constraints from Big Bang Nucleosynthesis as well as signatures of inflation we see imprinted on the CMB.
 
Vanadium,

Paul Davies, the Goldilocks Enigma
Cosmology lectures by the Teaching Company, I forget the lecturer, not to mention high school documentaries, probably wikipedia, probably Hawking's Brief History of Time.
 
First, you will not learn about science by reading books on philosophy.

Second, read Weinberg's "The First Three Minutes".

Third, try and pay more attention to this book than the others you "probably" read. After I am done reading a book, I usually remember if I read it or not.
 

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