- #1

Physics4Funn

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- 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.

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.