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38 papers · 1 filter
Two definitions of the electric polarizability of a bound system in relativistic quantum theory
F. A. B. Coutinho, Y. Nogami, Lauro Tomio
For the electric polarizability of a bound system in relativistic quantum theory, there are two definitions that have appeared in the literature. They differ depending on whether o…
Validity of Feynman's prescription of disregarding the Pauli principle in intermediate states
F. A. B. Coutinho, Y. Nogami, Lauro Tomio
Regarding the Pauli principle in quantum field theory and in many-body quantum mechanics, Feynman advocated that Pauli's exclusion principle can be completely ignored in intermedia…
Hadronic Vacuum Polarization and the Lamb Shift
J. L. Friar, J. Martorell, D. W. L. Sprung
Recent improvements in the determination of the running of the fine-structure constant also allow an update of the hadronic vacuum-polarization contribution to the Lamb shift. We f…
Temperature Evolution of the Pseudogap State in the Infra-Red Response of Underdoped La_(2-x)Sr_xCuO_4
T. Startseva, T. Timusk, A. V. Puchkov +5
The ab-plane optical spectra of two single crystals of underdoped La_(2-x)Sr_xCuO_4 were investigated. The reflectivity of La_(1.87)Sr_(0.13)CuO_4 has been measured in the frequenc…
Vortices with antiferromagnetic cores in the SO(5) theory of high temperature superconductivity
S. Alama, A. J. Berlinsky, L. Bronsard +1
We consider the problem of superconducting Ginzburg-Landau (G-L) vortices with antiferromagnetic cores which arise in Zhang's SO(5) model of antiferromagnetism (AF) and high temper…
The MACHO Project Large Magellanic Cloud Variable Star Inventory. VIII. The Recent Star Formation History of the LMC from the Cepheid Period Distribution
C. Alcock, R. A. Allsman, D. R. Alves +20
We present an analysis of the period distribution of Cepheids in the Large Magellanic Cloud, based on data obtained by the MACHO microlensing experiment and on a previo…