A What Does a Zero Metric Mean in the Context of Pre-Big Bang Physics?

[Physics4Funn]

TL;DR Summary

Discussions of before the Big Bang. When t=0 for the universe, one idea is that the metric is zero.

I know about these metrics
Euclidean metric
Einstein manifold
Riemannian, pseudo-Riemannian manifolds or Riemannian space
Lorentzian manifold
Minkowski space
Kähler manifold
Schwarzschild metric
Kerr, Kerr–Newman metrics
Reissner–Nordström metric
inverse or conjugate or dual metric
Induced metric

But in discussions of what happens before the Big Bang, some are saying that at t=0, the metric is zero.
I wonder what that means.

 

[Dale]

Summary:: Discussions of before the Big Bang. When t=0 for the universe, one idea is that the metric is zero.

in discussions of what happens before the Big Bang, some are saying that at t=0, the metric is zero.

Please provide a reference for this

 

[Physics4Funn]

Eric Ling, Rutgers University, “Spacetime extensions of the big bang”
http://causal-fermion-system.com/wp-content/uploads/2021/02/abstract-ling.pdf
is the seminar.
Other references were mentioned in the talk, but I didn't catch them, and I haven't yet re-watched the seminar to pick them out.

 

[Vanadium 50]

"Somewhere in this 67 minute video is the reference you want". Really?

What does a zeroi metric even mean? (0,0,0,0)?

 

[Physics4Funn]

I am sorry Vanadium.
Did you want a reference to somewhere in a paper?
I haven't found any of Eric Ling's papers online yet.

So a zero metric = (0,0,0,0)?
Is it just a simple fact like 0=0?
Is it just an imponderable like 'What is infinity?'
I haven't heard before of anyone considering what before the Big Bang was like.

Near the end of the talk the speaker referenced other researchers who were investigating this subject also. But I didn't get their names.

I hope that my post was not inappropriate.

 

[PeroK]

I am sorry Vanadium.
Did you want a reference to somewhere in a paper?
I haven't found any of Eric Ling's papers online yet.

So a zero metric = (0,0,0,0)?
Is it just a simple fact like 0=0?
Is it just an imponderable like 'What is infinity?'
I haven't heard before of anyone considering what before the Big Bang was like.

Near the end of the talk the speaker referenced other researchers who were investigating this subject also. But I didn't get their names.

I hope that my post was not inappropriate.

This is not "A" level analysis, though.

Whatever Eric Ling is presenting in that video is significantly more advanced and sophisticated than $0 = 0$ or pondering the nature of infinity!

 

[Dale]

Eric Ling, Rutgers University, “Spacetime extensions of the big bang”
http://causal-fermion-system.com/wp-content/uploads/2021/02/abstract-ling.pdf
is the seminar.
Other references were mentioned in the talk, but I didn't catch them, and I haven't yet re-watched the seminar to pick them out.

I skimmed through the presentation twice but didn’t see where he discussed a zero metric. Can you be more specific?

 

[martinbn]

My guess is, and i might be wrong, that by zero metric you mean $C^0$ metric. You just didn't think that the "c" was important. If i am right and if you don't know what that means, then you are not ready for the talk in the video.

 

[PeterDonis]

I haven't found any of Eric Ling's papers online yet.

Then go find one.

I haven't heard before of anyone considering what before the Big Bang was like.

Then you apparently have not read anything about inflation models, particularly "eternal inflation" models. And that means your level of knowledge is nowhere near what is appropriate for an "A" level discussion.

a zero metric

...is nonsense. If you want to show otherwise, find a peer-reviewed paper that explains what a "zero metric" is and why the concept is meaningful.

In the meantime, this thread is closed.