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 measure arises which is… (More)

The γn → KKn reaction on C has been studied by measuring both K and K at forward angles. A sharp baryon resonance peak was observed at 1.54 ± 0.01 GeV/c with a width smaller than 25 MeV/c and a… (More)

The Chaplygin gas model, characterized by an equation of state of the type p = − ρ emerges naturally from the Nambu-Goto action of string theory. This fluid representation can be recast under the… (More)

We extensively develop a perturbation theory for nonlinear cosmological dynamics, based on the Lagrangian description of hydrodynamics. We solve hydrodynamic equations for a self-gravitating fluid… (More)

We formulate a perturbative approximation to gravitational instability, based on Lagrangian hydrodynamics in Newtonian cosmology. We take account of ‘pressure’ effect of fluid, which is kinematically… (More)