My understanding is that, in the standard GR BB model, an expanding universe starts with infinite spacetime curvature but zero space curvature; but a collapsing universe ends with a diverging, spagghettifying spatial curvature - very different animals.(adsbygoogle = window.adsbygoogle || []).push({});

The LQC bounce however connects, through a very tiny, very fleeting high density QG phase, a collapse to an expansion. If they both look like their respective GR counterpart, the amount of work the QG phase has to do to forget everything about the horribly distorted collapse geometry and produce the smooth expansion geometry seems staggering.

But if the origin of time is at the bounce for both sides, then both geometries are spatially flat and the gluing is easy.

So my question is: are there articles discussing this possibilty in LQC or related approaches? Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Time direction in LQC bounce

**Physics Forums | Science Articles, Homework Help, Discussion**