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6 papers · 2 filters
Tolman-Bondi collapse in scalar-tensor theories as a probe of gravitational memory
T. Harada, C. Goymer, B. J. Carr
In cosmological models with a varying gravitational constant, it is not clear whether primordial black holes preserve the value of at their formation epoch. We investigate this…
Inhomogeneities in Newtonian Cosmology and its Backreaction to the Evolution of the Universe
Takayuki Tatekawa, Momoko Suda, Kei-ichi Maeda +1
We study an effect of inhomogeneity of density distribution of the Universe. We propose a new Lagrangian perturbation theory with a backreaction effect by inhomogeneity. The inhomo…
Reconstructing the equation of state for cold nuclear matter from the relationship of any two properties of neutron stars
Tomohiro Harada
A direct method is developed to reconstruct the equation of state for high-density nuclear matter from the relationship between any two properties of neutron stars, such as masses,…
Extending Lagrangian perturbation theory to a fluid with velocity dispersion
Masaaki Morita, Takayuki Tatekawa
We formulate a perturbative approximation to gravitational instability, based on Lagrangian hydrodynamics in Newtonian cosmology. We take account of `pressure' effect of fluid, whi…
Cosmological perturbations from multi-field inflation in generalized Einstein theories
Alexei A. Starobinsky, Shinji Tsujikawa, Jun'ichi Yokoyama
We study cosmological perturbations generated from quantum fluctuations in multi-field inflationary scenarios in generalized Einstein theories, taking both adiabatic and isocurvatu…
The Shape of EAS Lateral Distribution and Primary Composition of the UHE Cosmic Rays
R. I. Raikin, A. A. Lagutin, N. Inoue +1
Theoretical predictions for lateral distribution function of electrons in extensive air showers based on scaling formalism are presented. Our results are tested by comparison with…