How come scientist are able to say what happened immediately after the big bang?

Question

"LISA should be able to peer back in time much earlier—to one-trillionth of a second after the Big Bang"

??????

Answer 1

If you mean "immediately" literally, then scientists are NOT able to say what happened for the first E-43 seconds (that is, ten to the minus 43rd seconds, the first ten millionth of a trillionth of a trillionth of a trillionth of a second!). After that, they can and do say what happened. Most people might consider this immediately, but scientists don't.

After that, when gravity separates from the other forces, the standard model predicts most of what follows (although it didn't anticipate the recently discovered acceleration of the expansion of the universe that caused scientists to posit the existance of dark energy).

Answer 2

They aren't. But what they can do is imagine scenarios they think might have happened, and then analyze each and see if it's possible, based on known physical laws, whether that could result in the universe we know and love. Actually, they don't limit themselves to known physical laws, but they also consider how the physical laws might have changed.

It's a little like detectives looking at the scene of a murder. They think of all the possibilities they can think of, rule out those which they know couldn't have happened, and argue about which makes the most sense. In terms of the Big Bang, the trial is ongoing, evidence is still being considers, new suspects are being accused, and no verdict has been reached.

Answer 3

i think it's all conjecture and theory....sounds good though...