# Exact Classical Correspondence in Quantum Cosmology?

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1. Sep 2, 2015

### Garth

A paper published in 'Gravitation and Cosmology', [21, 208 (2015)] and on today's physics ArXiv claims to have found a solution to the Wheeler-DeWitt equation that exactly corresponds to the classical evolution of a Friedmann model with appropriate matter/energy density: Exact Classical Correspondence in Quantum Cosmology, interestingly it states:
Garth

Last edited: Sep 2, 2015
2. Sep 2, 2015

### marcus

Last edited: Sep 2, 2015
3. Sep 2, 2015

### Chalnoth

After the inflationary era? Pretty sure that would run afoul of primordial nucleosynthesis observations.

4. Sep 2, 2015

### Garth

Yes, he doesn't look at the CMB - or nucleosynthesis for that matter - perhaps there is work to be done on this model!

To be explicit, it is important to try alternative approaches in tentative 'toy models' that may not be able immediately to explain all observations, while explaining others, because they may be modified into a concordant model at a later date.

Garth

Last edited: Sep 6, 2015
5. Sep 7, 2015

### Alex Kostko

If the time was NOW and THEN, could it be true that LHC's primordial soup is the one that was in the beginning? What if we are in the beginning and the end?

6. Sep 7, 2015

### Garth

Hi Alex and welcome to these Forums!

However you will have to rephrase your question so that it makes sense - I can't tell whether you are 'coming or going'!

The LHC, although it does attain the highest energies/temperatures anywhere seen on Earth - especially under laboratory conditions - is nowhere near as energetic as the Inflation era.

Inflation is thought to take place from about t ~ 10-36 until 10-33-10-32 seconds after the 'BB' when the energy scale was around 1016 GeV or 10−3 times the Planck energy. By contrast the present enhanced LHC is capable of around 14 Tev or 14 x 103 GeV - some 12 orders of magnitude less.

Garth

Last edited: Sep 8, 2015
7. Sep 8, 2015