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6 papers · 1 filter
A volume-weighted measure for eternal inflation
Sergei Winitzki
I propose a new volume-weighted probability measure for cosmological "multiverse" scenarios involving eternal inflation. The "reheating-volume (RV) cutoff" calculates the distribut…
An exact Lagrangian integral for the Newtonian gravitational field strength
Thomas Buchert
An exact expression for the gravitational field strength in a self-gravitating dust continuum is derived within the Lagrangian picture of continuum mechanics. From the Euler-Newton…
The universe seen at different scales
G. F. R. Ellis, T. Buchert
A large-scale smoothed-out model of the universe ignores small-scale inhomogeneities, but the averaged effects of those inhomogeneities may alter both observational and dynamical r…
A cosmic equation of state for the inhomogeneous Universe: can a global far-from-equilibrium state explain Dark Energy?
Thomas Buchert
A system of effective Einstein equations for spatially averaged scalar variables of inhomogeneous cosmological models can be solved by providing a `cosmic equation of state'. Recen…
Information Entropy in Cosmology
Akio Hosoya, Thomas Buchert, Masaaki Morita
The effective evolution of an inhomogeneous cosmological model may be described in terms of spatially averaged variables. We point out that in this context, quite naturally, a meas…
Galaxies as Rotating Buckets - a Hypothesis on the Gravitational Constant Based on Mach's Principle
Alexander Unzicker
According to Mach's principle inertia has its reason in the presence of all masses in the universe. Despite there is a lot of sympathy for this plausible idea, only a few quantitat…