Uncovering the Mystery of the First Three Seconds in the Big Bang

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The discussion centers on the uncertainty surrounding the events of the first three seconds after the Big Bang, highlighting the lack of concrete evidence and the variety of scientific opinions on the matter. Participants reference a book titled "The First Three Minutes" by Steven Weinberg, which addresses related concepts but may not directly answer the original question. The conversation includes light-hearted exchanges about the topic, indicating a mix of seriousness and humor among contributors. Overall, the mystery of this early cosmic period remains a point of intrigue and debate in the scientific community. Understanding these initial moments is crucial for comprehending the universe's evolution.
QuantumMechanic
Does anyone have any information regarding the lack of knowledge as to what happened during the first three seconds of the Big Bang? I've recently found out that a lot of scientists have differing opinions but no one has any real evidence as to what occured. What are the different ideas circulating?
 
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QuantumMechanic said:
Does anyone have any information regarding the lack of knowledge as to what happened during the first three seconds of the Big Bang?

First three seconds after the putative "Big Bang"? (I thought there was a book by this title, but the one I found seems to be about something else...)
 
Chris Hillman said:
First three seconds after the putative "Big Bang"? (I thought there was a book by this title, but the one I found seems to be about something else...)
Chris, are you thinking perhaps about https://www.amazon.com/dp/0465024378/?tag=pfamazon01-20 by Steven Weinberg?

Garth
 
Last edited by a moderator:
Guess THAT fell flat!

Garth said:
Chris, are you thinking perhaps about The First Three Minutes by Steven Weinberg?

It was a silly joke (google on "first three seconds")
 
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Sorry, my stupid mistake! :blushing:

Garth
 
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Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

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Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
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