195 citations · 1.1k across the 29 of their papers we have counts for
4 papers · 1 filter
Cosmological particle production and the precision of the WKB approximation
Sergei Winitzki
Particle production by slow-changing gravitational fields is usually described using quantum field theory in curved spacetime. Calculations require a definition of the vacuum state…
Probabilities in the inflationary multiverse
Jaume Garriga, Delia Schwartz-Perlov, Alexander Vilenkin +1
Inflationary cosmology leads to the picture of a "multiverse," involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes.…
Time-reparametrization invariance in eternal inflation
Sergei Winitzki
I address some recently raised issues regarding the time-parametrization dependence in stochastic descriptions of eternal inflation. To clarify the role of the choice of the time g…
Drawing conformal diagrams for a fractal landscape
Sergei Winitzki
Generic models of cosmological inflation and the recently proposed scenarios of a recycling universe and the string theory landscape predict spacetimes whose global geometry is a s…