Asymptotically Safe gravity and non-singular inflationary Big Bang with vacuum birth

Understand

General non-singular accelerating cosmological solutions for an initial cosmic period of pure vacuum birth era are derived.

• This vacuum era is described by a varying cosmological "constant" suggested by the Renormalisation Group flow of Asymptotic Safety scenario near the ultraviolet fixed point.
• In this scenario, natural exit from inflation to the standard decelerating cosmology occurs when the energy scale lowers and the cosmological "constant" becomes insignificant.
• In the following period where matter is also present, cosmological solutions with characteristics similar to the vacuum case are generated.