37,470 research outputs found

    Canonical Theory of 2+1 Gravity

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    Recently 2+1 dimensional gravity theory, especially AdS3{\rm AdS_3} has been studied extensively. It was shown to be equivalent to the 2+1 Chern-Simon theory and has been investigated to understand the black hole thermodynamics, i.e. Hawking temperature and others. The purpose of this report is to investigate the canonical formalism of the original 2+1 Einstein gravity theory instead of the Chern-Simon theory. For the spherically symmetric space-time, local conserved quantities(local mass and angular momentum) are introduced and using them canonical quantum theory is defined. Constraints are imposed on state vectors and solved analytically. The strategy to obtain the solution is followed by our previous work.Comment: 6 pages, talk given at LLWI-2000: From Particles to Universe, Alberta, 20-26 February 200

    Resonance energy of the barKNN-piYN system

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    The resonance energies of strange dibaryons are investigated with the use of the \bar{K}NN-\pi Y N coupled-channels Faddeev equation. It is found that the pole positions of the predicted three-body amplitudes are significantly modified when the three-body coupled-channels dynamics is approximated, as is done in the literature, by the effective two-body \bar{K}N interactions.Comment: 14 pages, 5 figure

    Vortical amplification of magnetic field at inward shock of supernova remnant Cassiopeia A

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    We present an interpretation of the time variability of the XX-ray flux recently reported from a multi-epoch campaign of 1515 years observations of the supernova remnant Cassiopeia A by {\it Chandra}. We show for the first time quantitatively that the [4.2−6][4.2-6] keV non-thermal flux increase up to 50%50\% traces the growth of the magnetic field due to vortical amplification mechanism at a reflection inward shock colliding with inner overdensities. The fast synchrotron cooling as compared with shock-acceleration time scale qualitatively supports the flux decrease.Comment: 5 pages, 2 figures, PRL in pres

    Quasiparticles and Energy Scaling in Bi2_2Sr2_2Can−1_{n-1}Cun_nO2n+4_{2n+4} (n\it{n}=1-3): Angle-Resolved Photoemission Spectroscopy

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    Angle-resolved photoemission spectroscopy (ARPES) has been performed on the single- to triple-layered Bi-family high-{\it Tc_c} superconductors (Bi2_2Sr2_2Can−1_{n-1}Cun_nO2n+4_{2n+4}, n\it{n}=1-3). We found a sharp quasiparticle peak as well as a pseudogap at the Fermi level in the triple-layered compound. Comparison among three compounds has revealed a universal rule that the characteristic energies of superconducting and pseudogap behaviors are scaled with the maximum {\it Tc_c}.Comment: 4 pages, 4 figure
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