74 citations · 381 across the 34 of their papers we have counts for
34 papers
Higher Dimensional Polytopal Universe in Regge Calculus
Ren Tsuda, Takanori Fujiwara
Higher dimensional closed Friedmann-Lemaître-Robertson-Walker (FLRW) universe with positive cosmological constant is investigated by Regge calculus. A Cauchy surface of discretized…
Oscillating 4-Polytopal Universe in Regge Calculus
Ren Tsuda, Takanori Fujiwara
The discretized closed Friedmann-Lemaître-Robertson-Walker (FLRW) universe with positive cosmological constant is investigated by Regge calculus. According to the Collins-Williams…
Topological magnetoelectric pump in three dimensions
T. Fukui, T. Fujiwara
We study the topological pump for a lattice fermion model mainly in three spatial dimensions. We first calculate the U(1) current density for the Dirac model defined in continuous…
Expanding Polyhedral Universe in Regge Calculus
Ren Tsuda, Takanori Fujiwara
The closed Friedmann--Lemaître--Robertson--Walker (FLRW) universe of Einstein gravity with positive cosmological constant in three dimensions is investigated by using the Collins--…
Streda formula for the Hofstadter-Wilson-Dirac model in two and four dimensions
T. Fukui, T. Fujiwara
We rederive the spectral asymmetry of the Wilson-Dirac model in external fields, paying attention to the Chern number due to the Berry connection. We interpret the smooth part of t…
Bulk-edge correspondence for Chern topological phases: A viewpoint from a generalized index theorem
T. Fukui, K. Shiozaki, T. Fujiwara +1
We explore the bulk-edge correspondence for topological insulators (superconductors) without time-reversal symmetry from the point of view of the index theorem for open spaces. We…