6 citations · 6 across the 1 of their papers we have counts for
4 papers
Monopole Inflation in Brans-Dicke Theory
Nobuyuki Sakai, Jun'ichi Yokoyama, Kei-ichi Maeda
According to previous work, topological defects expand exponentially without an end if the vacuum expectation value of the Higgs field is of the order of the Planck mass. We extend…
Tree-level String Cosmology
Richard Easther, Kei-ichi Maeda, David Wands
In this paper we examine the classical evolution of a cosmological model derived from the low-energy tree-level limit of a generic string theory. The action contains the metric, di…
Dynamics of Topological Defects and Inflation
Nobuyuki Sakai, Hisa-aki Shinkai, Takashi Tachizawa +1
We study the dynamics of topological defects in the context of ``topological inflation" proposed by Vilenkin and Linde independently. Analysing the time evolution of planar domain…
Junction Conditions of Friedmann-Robertson-Walker Space-Times
Nobuyuki Sakai, Kei-ichi Maeda
We complete a classification of junctions of two Friedmann-Robertson-Walker space-times bounded by a spherical thin wall. Our analysis covers super-horizon bubbles and thus complem…