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2016

The critical geometry of a thermal big bang

Afshordi, Niayesh, Magueijo, Joao

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We explore the space of scalar-tensor theories containing two non-conformalmetrics, and find a discontinuity pointing to a "critical" cosmological solution.

Due to the different maximal speeds of propagation for matter and gravity,the cosmological fluctuations start off inside the horizon even without inflation, and will more naturally have a thermal origin (since there is never vacuum domination).
The critical model makes an unambiguous, non-tuned prediction for the spectral index of the scalar fluctuations: $n_S= 0.96478(64)$.
Considering also that no gravitational waves are produced, we have unveiled the most predictive model on offer.

The critical geometry of a thermal big bang · Around

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2016

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