148,354 research outputs found
Dilaton test of connection between AdS_3 X S^3 and 5D black hole
A 5D black hole(M) is investigated in the type IIB superstring theory
compactified on ST. This corresponds to AdSST in the near horizon with asymptotically flat space. Here the
harmonic gauge is introduced to decouple the mixing between the dilaton and
others. On the other hand we obtain the BTZ balck
hole(AdSST) as the non-dilatonic solution. We calculate
the greybody factor of the dilaton as a test scalar both for a 5D black
hole(MST) and the BTZ black hole(AdSST). The result of the BTZ black hole agrees with the greybody
factor of the dilaton in the dilute gas approximation of a 5D black hole.Comment: revised version to appear in classical and quantum gravity, 15 pages
with RevTe
Quantum Tunneling and Phase Transitions in Spin Systems with an Applied Magnetic Field
Transitions from classical to quantum behaviour in a spin system with two
degenerate ground states separated by twin energy barriers which are asymmetric
due to an applied magnetic field are investigated. It is shown that these
transitions can be interpreted as first- or second-order phase transitions
depending on the anisotropy and magnetic parameters defining the system in an
effective Lagrangian description.Comment: 18 pages, 7 figure
Measurement of the Hyperfine Structure and Isotope Shifts of the 3s23p2 3P2 to 3s3p3 3Do3 Transition in Silicon
The hyperfine structure and isotope shifts of the 3s23p2 3P2 to 3s3p3 3Do3
transition in silicon have been measured. The transition at 221.7 nm was
studied by laser induced fluorescence in an atomic Si beam. For 29Si, the
hyperfine A constant for the 3s23p2 3P2 level was determined to be -160.1+-1.3
MHz (1 sigma error), and the A constant for the 3s3p3 3Do3 level is -532.9+-0.6
MHz. This is the first time that these constants were measured. The isotope
shifts (relative to the abundant isotope 28Si) of the transition were
determined to be 1753.3+-1.1 MHz for 29Si and 3359.9+-0.6 MHz for 30Si. This is
an improvement by about two orders of magnitude over a previous measurement.
From these results we are able to predict the hyperfine structure and isotope
shift of the radioactive 31Si atom, which is of interest in building a scalable
quantum computer
Quantum-mechanical wavepacket transport in quantum cascade laser structures
We present a viewpoint of the transport process in quantum cascade laser
structures in which spatial transport of charge through the structure is a
property of coherent quantum-mechanical wavefunctions. In contrast, scattering
processes redistribute particles in energy and momentum but do not directly
cause spatial motion of charge.Comment: 6 pages, 5 figures included in tex, to appear in Physical Review
Analysis of the spectral function of Nd1.85Ce0.15CuO4, obtained by angle resolved photoemission spectroscopy
Samples of Nd(2-x)Ce(x)CuO(4), an electron-doped high temperature
superconducting cuprate (HTSC), near optimal doping at x = 0.155 were measured
via angle resolved photoemission (ARPES). We report a renormalization feature
in the self energy ("kink") in the band dispersion at 50 - 60 meV present in
nodal and antinodal cuts across the Fermi surface. Specifically, while the kink
had previously only been seen in the antinodal region, it is now observed also
in the nodal region, reminiscent of what has been observed in hole-doped
cuprates.Comment: 4 pages, 4 figure
Scattering from an AdS_3 bubble and an exact AdS_3
We investigate the close relationship between the potential and absorption
cross section for test fields in an AdS bubble(a 5D black hole) and an
exact AdS. There are two solutions in type IIB string theory: an AdS
bubble corresponds to the dilatonic solution, while an exact AdS is the
non-dilatonic solution. In order to obtain the cross section for an AdS
bubble, we introduce the \{out\}-state scattering picture with the AdS-AFS
matching procedure. For an exact AdS, one considers the \{in\}-state
scattering picture with the AdS-AdS matching. Here the non-normalizable
modes are crucially taken into account for the matching procedure. It turns out
that the cross sections for the test fields in an AdS bubble take the same
forms as those in an exact AdS. This suggests that in the dilute gas and
the low energy limits, the S-matrix for an AdS bubble can be derived from
an exact AdS space.Comment: revised version to appear in Physical Review D, 26 pages with
embedded 5 EPS figures in RevTex forma
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