• Publications
  • Influence
Absence of zero resonances of massless Dirac operators
  • D. Aiba
  • Mathematics, Physics
  • 31 January 2014
We consider the massless Dirac operator $H=\alpha \cdot D+Q(x)$ on the Hilbert space $L^{2}(\mathbb{R}^{3},\mathbb{C}^{4})$, where $Q(x)$ is a $4\times4$ Hermitian matrix valued function whichExpand
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A New Species of Eubostrychoceras (Ammonoidea, Nostoceratidae) from the Lower Campanian in the Northwestern Pacific Realm
Abstract. A new species of heteromorph ammonoid Eubostrychoceras valdelaxum sp. nov. is described from the Platyceramus japonicus Zone (the lowermost Campanian) of the Haboro and Mikasa areas inExpand
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A Possible Phylogenetic Relationship of Two Species of Hyphantoceras (Ammonoidea, Nostoceratidae) in the Cretaceous Yezo Group, Northern Japan
  • D. Aiba
  • Biology
  • Paleontological Research
  • 2019
Abstract. A possible phylogenetic relationship of two species of Hyphantoceras (Ammonoidea, Nostoceratidae) was proposed, based on newly found specimens with precise stratigraphic occurrences in theExpand
Fossils in the Japanese archipelago and Japanese Geoparks
SCHRÖDINGER EQUATIONS WITH TIME-DEPENDENT STRONG MAGNETIC FIELDS
Time dependent d-dimensional Schrödinger equations i∂tu = H(t)u, H(t) = −(∂x − iA(t, x))2 +V (t, x) are considered in the Hilbert space G = L2(Rd) of square integrable functions. V (t, x) and A(t, x)Expand
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Covariance of sutural complexity with whorl shape: evidence from intraspecific analyses of the Cretaceous ammonoid Desmoceras
In order to test the hypothesis that complex suture lines in ammonoids reinforced their shell strength, intraspecific variation of sutural complexity and shell morphologies (whorl shape and septalExpand
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