4 papers
Change of ownership networks in Japan
Wataru Souma, Yoshi Fujiwara, Hideaki Aoyama
As complex networks in economics, we consider Japanese shareholding networks as they existed in 1985, 1990, 1995, 2000, 2002, and 2003. In this study, we use as data lists of share…
Small-World Effects in Wealth Distribution
Wataru Souma, Yoshi Fujiwara, Hideaki Aoyama
We construct a model of wealth distribution, based on an interactive multiplicative stochastic process on static complex networks. Through numerical simulations we show that a decr…
Gauge and Cutoff Function Dependence of the Ultraviolet Fixed Point in Quantum Gravity
Wataru Souma
The exact renormalization group equation for pure quantum gravity is derived for an arbitrary gauge parameter in the space-time dimension . This equation is given by a non-lin…
Scheme Dependence of the Wilsonian Effective Action and Sharp Cutoff Limit of the Flow Equation
Jun-Ichi Sumi, Wataru Souma, Ken-Ichi Aoki +2
The cutoff scheme dependence in the several formulations of the Exact Renormalization Group (ERG) is investigated. It is shown that the cutoff scheme dependence of the Wilsonian ef…