69 citations · 233 across the 9 of their papers we have counts for
9 papers
Relative information entropy and Weyl curvature of the inhomogeneous Universe
Nan Li, Thomas Buchert, Akio Hosoya +2
Penrose conjectured a connection between entropy and Weyl curvature of the Universe. This is plausible, as the almost homogeneous and isotropic Universe at the onset of structure f…
Relative information entropy of an inhomogeneous universe
Masaaki Morita, Thomas Buchert, Akio Hosoya +1
In the context of averaging an inhomogeneous cosmological model, we propose a natural measure identical to the Kullback-Leibler relative information entropy, which expresses the di…
Power spectrum in the Chaplygin gas model: tachyonic, fluid and scalar field representations
C. E. M. Batista, J. C. Fabris, M. Morita
The Chaplygin gas model, characterized by an equation of state of the type emerges naturally from the Nambu-Goto action of string theory. This fluid representatio…
Bose Einstein Condensation as Dark Energy and Dark Matter
Masako Nishiyama, Masa-aki Morita, Masahiro Morikawa
We study a cosmological model in which the boson dark matter gradually condensates into dark energy. Negative pressure associated with the condensate yields the accelerated expansi…
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…
Perturbation theory in Lagrangian hydrodynamics for a cosmological fluid with velocity dispersion
Takayuki Tatekawa, Momoko Suda, Kei-ichi Maeda +2
We extensively develop a perturbation theory for nonlinear cosmological dynamics, based on the Lagrangian description of hydrodynamics. We solve hydrodynamic equations for a self-g…