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Articles 1  12 of 12
FullText Articles in Physics
UDuality, DBranes And Black Hole Emission Rates: Agreements And Disagreements, Fay Dowker, David Kastor, Jennie Traschen
UDuality, DBranes And Black Hole Emission Rates: Agreements And Disagreements, Fay Dowker, David Kastor, Jennie Traschen
David Kastor
An expression for the spacetime absorption coefficient of a scalar field in a five dimensional, near extremal black hole background is derived, which has the same form as that presented by Maldacena and Strominger, but is valid over a larger, Uduality invariant region of parameter space and in general disagrees with the corresponding Dbrane result. We develop an argument, based on Dbrane thermodynamics, which specifies the range of parameters over which agreement should be expected. For neutral emission, the spacetime and Dbrane results agree over this range. However, for charged emission, we find disagreement in the `Fat Black Hole' regime ...
Spectral Features Of The Stimulated Raman Backscattering Of Modulated Laser Pulses In A Plasma, Nikolai E. Andreev, Serguei Y. Kalmykov
Spectral Features Of The Stimulated Raman Backscattering Of Modulated Laser Pulses In A Plasma, Nikolai E. Andreev, Serguei Y. Kalmykov
Serge Youri Kalmykov
The characteristic features of the stimulated Raman backscattering of short modulated (multifrequency) laser pulses in an underdense plasma are investigated. A laser pulse consisting of a given pair of spectral components with the frequency difference close to the double plasma frequency is studied in the weak mode coupling approximation. The scattering of the component with the higher frequency is shown to be a fivewave resonant process, and the conditions under which this process is totally suppressed are found. The scattering of the component with the lower frequency is an ordinary threewave decay process without any suppression. When the difference between ...
Investigation Of The 10b(Γ,P) Reaction Using Tagged Photons, L J. De Bever, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Investigation Of The 10b(Γ,P) Reaction Using Tagged Photons, L J. De Bever, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Gerald Alvin Peterson
The reaction 10B(γ,p) has been studied using tagged photons of mean energies Eγ=57.6 and 72.9 MeV. Angular distributions and derived singleparticle momentum distributions for protons leading to the ground state of 9Be and higher excited states are compared to various calculations made using model parameters constrained by 10B(e,e′p)9Be and 9Be(p,p′)9Be measurements. The effects of varying finalstate interactions (including channel couplings) and meson exchange currents are considered. A sizable discrepancy between directknockout calculations and the experimental results is observed. If meson exchange currents are included in an approximate fashion ...
Measurements Of The Δ(1232) Transition Form Factor And The Ratio Σn/Σp From Inelastic ElectronProton And ElectronDeuteron Scattering, L M. Stuart, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson, S H. Rokni
Measurements Of The Δ(1232) Transition Form Factor And The Ratio Σn/Σp From Inelastic ElectronProton And ElectronDeuteron Scattering, L M. Stuart, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson, S H. Rokni
Gerald Alvin Peterson
Measurements of inclusive electronscattering cross sections using hydrogen and deuterium targets in the region of the Δ(1232) resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the fourmomentum transfer squared range 1.64
Resistivity Of BoronDoped Diamond Microcrystals, M. D. Jaeger, S. Hyun, Anthony Roy Day, M. F. Thorpe, B. Golding
Resistivity Of BoronDoped Diamond Microcrystals, M. D. Jaeger, S. Hyun, Anthony Roy Day, M. F. Thorpe, B. Golding
Anthony Roy Day
We describe measurements of the electrical resistivity of micronsize crystallites of borondoped diamond. Electronbeam lithography was employed for writing samplespecific contacts on small, wellfaceted diamond crystals grown by chemicalvapor deposition on silicon substrates. After generating a threedimensional computer model of the crystallite, a finiteelement analysis was used to calculate the internal electrostatic potential distribution. Multiterminal resistance measurements, in conjunction with a computed geometrical factor, enabled the absolute resistivity to be determined. We find that the resistivities obtained from two different crystallites agree to better than 10%. The results are compared with transport measurements on a largearea homoepitaxial diamond film grown ...
Radial Dependence Of The Nucleon Effective Mass In 10b, L J. De Bever, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Radial Dependence Of The Nucleon Effective Mass In 10b, L J. De Bever, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson
Gerald Alvin Peterson
The dynamic properties of the atomic nucleus depend strongly on correlations between the nucleons. We present a combined analysis of inelastic electronscattering data and electroninduced proton knockout measurements in an effort to obtain phenomenological information on nucleonnucleon correlations. Our results indicate that the ratio of radial wave functions extracted from precise 10B(e,e′) and 10B(e,e′p) measurements evolve from an interior depression for small Em, characteristic of shortrange correlations, to a surfacepeaked enhancement for larger Em, characteristic of longrange correlations. This observation can be interpreted in terms of the nucleon effective mass.
QuantumStatistical Properties Of Two Coupled Modes Of Electromagnetic Field, Serguei Y. Kalmykov, Mikhail E. Veisman
QuantumStatistical Properties Of Two Coupled Modes Of Electromagnetic Field, Serguei Y. Kalmykov, Mikhail E. Veisman
Serge Youri Kalmykov
Squeezing the quantum fluctuations of the twomode light due to the nonstationary coupling between the quadrature components q_1 and q_2 is examined. The deltafunction and stepfunction mode couplings are considered. The conditions of weak and strong stepfunction coupling are distinguished, the latter being the condition of the instability for the classical counterpart of the quantum system under study. Under the conditions of weak coupling the quadrature squeezing is established in both a twomode electromagnetic noise in thermal equilibrium (the thermal state) and a two mode correlated coherent state (CCS). Squeezing in the thermal state is suppressed at a high temperature ...
Anthropic Considerations In Multiple Domain Theories And The Scale Of Electroweak Symmetry Breaking, V. Agrawal, S. M. Barr, John Donoghue, D. Seckel
Anthropic Considerations In Multiple Domain Theories And The Scale Of Electroweak Symmetry Breaking, V. Agrawal, S. M. Barr, John Donoghue, D. Seckel
John Donoghue
Density Fluctuations In Vibrated Granular Materials , E.R. Nowak, J.B. Knight, E. BenNaim, H.M Jaeger, S.R. Nagel
Density Fluctuations In Vibrated Granular Materials , E.R. Nowak, J.B. Knight, E. BenNaim, H.M Jaeger, S.R. Nagel
Eli BenNaim
We report systematic measurements of the density of a vibrated granular material as a function of time. Monodisperse spherical beads were confined to a cylindrical container and shaken vertically. Under vibrations, the density of the pile slowly reaches a final steadystate value about which the density fluctuates. We have investigated the frequency dependence and amplitude of these fluctuations as a function of vibration intensity Γ. The spectrum of density fluctuations around the steady state value provides a probe of the internal relaxation dynamics of the system and a link to recent thermodynamic theories for the settling of granular material. In ...
Crossing Of Disclinations In Nematic Slabs, T. Ishikawa, Oleg Lavrentovich
Crossing Of Disclinations In Nematic Slabs, T. Ishikawa, Oleg Lavrentovich
Oleg Lavrentovich
It is shown experimentally that crossing and intercommutation of disclinations in a bounded nematic cell depend on surface orientation of the director and the relative strength of disclinations. Lines of opposite strength switch the pinned ends between the bounding plates and vanish independently of each other if the surface orientation is tangential. In contrast, tilted surface orientation preserves the stability of lines.
Resistivity Determination From Small Crystallites, S. Hyun, M. Thorpe, B. Golding, M. Jaeger, Anthony Day
Resistivity Determination From Small Crystallites, S. Hyun, M. Thorpe, B. Golding, M. Jaeger, Anthony Day
Anthony Roy Day
We determine the resistivity of small micrometersized conductors with arbitrary shapes. It is shown that with n terminals attached to the sample, there are n(n1)/2 independent measurements of the resistance that can be made; from which the sample resistivity and the contact resistances can be extracted. An image of the sample is digitized and a finite element analysis is used to determine the geometrical factors that arise from the nonuniform current flow and hence control the resistance measurements. It is shown that all the elements of the resistance matrix for the sample are generated from the diagonal ...
Measurements Of KleinmanDisallowed Hyperpolarizability In Conjugated Chiral Molecules, S. Hubbard, R. Petschek, K. Singer, N. D'Sidocky, C. Hudson, LiangChy Chien, C. Henderson, P. Cahill
Measurements Of KleinmanDisallowed Hyperpolarizability In Conjugated Chiral Molecules, S. Hubbard, R. Petschek, K. Singer, N. D'Sidocky, C. Hudson, LiangChy Chien, C. Henderson, P. Cahill
LiangChy Chien
We have designed a hyperRayleigh scattering scheme to measure six scalar invariants of the squared hyperpolarizability tensor beta(2). OUT theoretical approach expresses the rotational invariants of the irreducible beta components as scalars, which eliminates the need for difficult frame transformations. We applied our scheme to several conjugated chiral molecules and found that there are significant Kleinmandisallowed pseudotensor contributions to their hyperpolarizability. These components, along with a large optical rotation and the results of quantumchemical calculations, indicate a handed nonplanar delocalization of the chargetransfer system in such molecules as predicted by quantumchemical calculations and are expected to lead to macroscopic ...