7 papers
Magnetic Catalysis and Fermion Mass Generation in de Sitter Spacetime
Kohei Fujikura, Toshifumi Noumi, Shintetsu Yamazaki
We consider the dynamics of a charged fermion in de Sitter space in the presence of a uniform background magnetic field, and discuss magnetic catalysis of chiral symmetry breaking…
Dense with uniform matrix product states
Kohei Fujikura, Yoshimasa Hidaka
We study cold dense single-flavor gauge theory in dimensions in the thermodynamic limit using a gauge-invariant variational uniform matrix product state an…
Inflationary QCD phase diagram
Kohei Fujikura, Toshifumi Noumi
Motivated by the cosmological collider program, which aims to probe high-energy physics through inflation, we investigate the phase diagram of multi-flavor QCD in de Sitter spaceti…
Conformal Phase Transition in Supersymmetric QCD
Kohei Fujikura, Shota Nakagawa, Yuichiro Nakai +2
We construct a four-dimensional supersymmetric QCD in conformal window with a marginally relevant deformation which triggers the spontaneous breaking of (approximate) scale invaria…
Critical behavior of the Schwinger model via gauge-invariant VUMPS
Hirotsugu Fujii, Kohei Fujikura, Yoshio Kikukawa +2
We study the lattice Schwinger model by combining the variational uniform matrix product state (VUMPS) algorithm with a gauge-invariant matrix product ansatz that locally enforces…
Formation of defects associated with both spontaneous and explicit symmetry breaking
Kohei Fujikura, Mairi Sakellariadou, Michiru Uwabo-Niibo +1
We discuss formation of cosmic strings associated with a spontaneously broken approximate symmetry by performing classical field-theoretical simulations. An original …