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37 papers · 1 filter
Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
Kazuharu Bamba
The generation of large-scale magnetic fields in inflationary cosmology is explored, in particular, in a kind of moduli inflation motivated by racetrack inflation in the context of…
Report on a User Test and Extension of a Type Debugger for Novice Programmers
Yuki Ishii, Kenichi Asai
A type debugger interactively detects the expressions that cause type errors. It asks users whether they intend the types of identifiers to be those that the compiler inferred. How…
Weak convergence of the Wojcik model
Takako Endo, Norio Konno
We study "the Wojcik model" which is a discrete-time quantum walk (QW) with one defect in one dimension, introduced by Wojcik et al.. For the Wojcik model, we give the weak converg…
Weak limit theorem of a two-phase quantum walk with one defect
Shimpei Endo, Takako Endo, Norio Konno +2
We attempt to analyze a one-dimensional space-inhomogeneous quantum walk (QW) with one defect at the origin, which has two different quantum coins in positive and negative parts. W…
Inflationary universe from perfect fluid and gravity and its comparison with observational data
Kazuharu Bamba, Shin'ichi Nojiri, Sergei D. Odintsov +1
We investigate the descriptions for the observables of inflationary models, in particular, the spectral index of curvature perturbations, the tensor-to-scalar ratio, and the runnin…
Singular eigenstates in the even(odd) length Heisenberg spin chain
Pulak Ranjan Giri, Tetsuo Deguchi
We study the implications of the regularization for the singular solutions on the even(odd) length spin-1/2 XXX chains in some specific down-spin sectors. In particular, the analyt…