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Articles 1 - 30 of 99
Full-Text Articles in Physical Sciences and Mathematics
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Emeritus Faculty Author Gallery
No abstract provided.
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Otto Vogl
No abstract provided.
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Emeritus Faculty Author Gallery
No abstract provided.
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Otto Vogl
No abstract provided.
Investigating The Long-Term Evolution Of Galaxies: Noise, Cuspy Halos And Bars, Martin D. Weinberg
Investigating The Long-Term Evolution Of Galaxies: Noise, Cuspy Halos And Bars, Martin D. Weinberg
Astronomy Department Faculty Publication Series
I review the arguments for the importance of halo structure in driving galaxy evolution and coupling a galaxy to its environment. We begin with a general discussion of the key dynamics and examples of structure dominated by modes. We find that simulations with large numbers of particles (N ≥ 106) are required to resolve the dynamics. Finally, I will describe some new results which demonstrates that a disk bar can produce cores in a cuspy CDM dark-matter profile within a gigayear. An inner Lindblad-like resonance couples the rotating bar to halo orbits at all radii through the cusp, rapidly flattening …
A Polytope Combinatorics For Semisimple Groups, Jared E. Anderson
A Polytope Combinatorics For Semisimple Groups, Jared E. Anderson
Mathematics and Statistics Department Faculty Publication Series
Mirkovi and Vilonen discovered a canonical basis of algebraic cycles for the intersection homology of (the closures of the strata of) the loop Grassmannian. The moment map images of these varieties are a collection of polytopes, and they may be used to compute weight multiplicities and tensor product multiplicities for representations of a semisimple group. The polytopes are explicitly described for a few low rank groups.
Relativistic Effects And Two-Body Currents In 2h(E⃗,E′P)N Using Out-Of-Plane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Relativistic Effects And Two-Body Currents In 2h(E⃗,E′P)N Using Out-Of-Plane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
Measurements of the 2H(e⃗,e′p)n reaction were performed with the out-of-plane magnetic spectrometers (OOPS) at the MIT-Bates Linear Accelerator. The longitudinal-transverse, fLT and fLT′, and the transverse-transverse, fTT, interference responses at a missing momentum of 210MeV/c were simultaneously extracted in the dip region at Q2 = 0.15 (GeV/c)2. In comparison to models of deuteron electrodisintegration, the data clearly reveal strong effects of relativity and final-state interactions and the importance of two-body meson-exchange currents and isobar configurations. We demonstrate that such effects can be disentangled by extracting these responses using the novel out-of-plane technique.
Electroproduction Of The Λ(1520) Hyperon, S P. Barrow, L Dennis, S B. Mcaleer, B Asavapibhop, R S. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Electroproduction Of The Λ(1520) Hyperon, S P. Barrow, L Dennis, S B. Mcaleer, B Asavapibhop, R S. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
The reaction ep⃗e′K+Λ(1520) with Λ(1520)→p′K- was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cosθK+, φK+, Q2, and W dependencies of Λ(1520) electroproduction are presented for the kinematic region 0.9
Elliptic Functions And Equations Of Modular Curves, Lev A. Borisov, Paul E. Gunnells, Sorin Popescu
Elliptic Functions And Equations Of Modular Curves, Lev A. Borisov, Paul E. Gunnells, Sorin Popescu
Paul Gunnells
Let P≥5 be a prime. We show that the space of weight one Eisenstein series defines an embedding into P(p−3)/2 of the modular curve X1(p) for the congruence group Γ1(p) that is scheme-theoretically cut out by explicit quadratic equations.
Measurement Of The Elastic Magnetic Form Factor Of 3he At High Momentum Transfer, I Nakagawa, J Shaw, S Churchwell, X Jiang, B Asavapibhop, M C. Berisso, P E. Bosted, K Burchesky, R S. Hicks, A Hotta, R A. Miskimen, Gerald Alvin Peterson, S E. Rock
Measurement Of The Elastic Magnetic Form Factor Of 3he At High Momentum Transfer, I Nakagawa, J Shaw, S Churchwell, X Jiang, B Asavapibhop, M C. Berisso, P E. Bosted, K Burchesky, R S. Hicks, A Hotta, R A. Miskimen, Gerald Alvin Peterson, S E. Rock
Gerald Alvin Peterson
New electron scattering measurements have been made that extend data on the 3He elastic magnetic form factor up to Q2 = 42.6fm-2. These new data test theoretical conjectures regarding non-nucleonic effects in the three-body system. The very small cross sections, as low as 10-40cm2/sr, required the use of a high-pressure cryogenic gas target and a detector system with excellent background rejection capability. No existing theoretical calculation satisfactorily accounts for all the available data.
A Solid State 13c Nmr Study Of Kerogen Degradation During Black Shale Weathering, Steven T. Petsch, R. J. Smernik, T. I. Eglinton, J. M. Oades
A Solid State 13c Nmr Study Of Kerogen Degradation During Black Shale Weathering, Steven T. Petsch, R. J. Smernik, T. I. Eglinton, J. M. Oades
Steven T. Petsch
Solid state 13C nuclear magnetic resonance (NMR) spectroscopy is used to examine kerogen composition in weathering profiles of the Monterey, Green River, Woodford, and New Albany formations. Techniques include cross polarization (CP) and Bloch decay (BD) spectral acquisition, dipolar dephasing (DD), spin counting, experiments to provide estimates of relaxation times (T1ρH and T1H), and proton spin relaxation editing (PSRE). It is demonstrated that CP/MAS (cross polarization/magic angle spinning) spectra obtained on isolated kerogens provide reliable characterization of kerogen composition (compared with BD spectra and whole-rock samples). Highly aliphatic (polymethylenic) kerogens are not appreciably altered during weathering. Aromatic and/or branched aliphatic …
Exclusive Electroproduction Of Φ Mesons At 4.2 Gev, K Lukashin, E S. Smith, B Asavapibhop, R A. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Exclusive Electroproduction Of Φ Mesons At 4.2 Gev, K Lukashin, E S. Smith, B Asavapibhop, R A. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
We studied the exclusive reaction ep⃗e′p′φ using the φ⃗K+K- decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in Q2 from 0.7 to 2.2 GeV2, and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of φ production on the proton. Our measurement shows the expected decrease of the t slope with the vector-meson formation time cΔτ below 2 fm. At 〈cΔτ〉=0.6 fm, we measure bφ=2.27±0.42 GeV-2. The cross …
A Homotopy Theory Of Orbispaces, Weimin Chen Chen
A Homotopy Theory Of Orbispaces, Weimin Chen Chen
Weimin Chen
An orbifold is a singular space which is locally modeled on the quotient of a smooth manifold by a smooth action of a finite group. It appears naturally in geometry and topology when group actions on manifolds are involved and the stabilizer of each fixed point is finite. The concept of an orbifold was first introduced by Satake under the name “V -manifold” in a paper where he also extended the basic differential geometry to his newly defined singular spaces (cf. [32]). The local structure of an orbifold – being the quotient of a smooth manifold by a finite group …
Language Models For Hierarchical Summarization (Proposal For Dissertation), Dawn Lawrie
Language Models For Hierarchical Summarization (Proposal For Dissertation), Dawn Lawrie
Computer Science Department Faculty Publication Series
Hierarchies have long been used for organization, summarization, and access to information. In this proposal we define summarization in terms of a probabilistic language model and use the definition to explore new techniques for automatically generating topic hierarchies. One technique applies a graph-theoretic algorithm, which is an approximation of the Dominating Set Problem. Another technique uses an entropy-based approach to choose topic terms. Both techniques efficiently select terms according to a language model. We compare the new techniques to previous methods proposed for constructing topic hierarchies including subsumption and lexical hierarchies, as well as words found using TF.IDF. Our preliminary …
A New Cohomology Theory Of Orbifold, Weimin Chen Chen
A New Cohomology Theory Of Orbifold, Weimin Chen Chen
Weimin Chen
No abstract provided.
Quaternionic Holomorphic Geometry: Plucker Formula, Dirac Eigenvalue Estimates And Energy Estimates Of Harmonic 2-Tori, D Ferus, K Leschke, F Pedit, U Pinkall
Quaternionic Holomorphic Geometry: Plucker Formula, Dirac Eigenvalue Estimates And Energy Estimates Of Harmonic 2-Tori, D Ferus, K Leschke, F Pedit, U Pinkall
Mathematics and Statistics Department Faculty Publication Series
No abstract provided.
Geometric Representation Theory Of Restricted Lie Algebras, I Mirkovic, D Rumynin
Geometric Representation Theory Of Restricted Lie Algebras, I Mirkovic, D Rumynin
Mathematics and Statistics Department Faculty Publication Series
We modify the Hochschild -map to construct central extensions of a restricted Lie algebra. Such central extension gives rise to a goup scheme that leads to a geometric construction of unrestricted representations. For a classical semisimple Lie algebra, we construct equivariant line bundles whose global sections afford representations with a nilpotentp-character.
4. Bengt Rånby (1920-2000), Otto Vogl, Gerald S. Kirshenbaum
4. Bengt Rånby (1920-2000), Otto Vogl, Gerald S. Kirshenbaum
Emeritus Faculty Author Gallery
No abstract provided.
Department Of Physics Newsletter: Spring 2001, Gerry Peterson, Bob Krotkov, Mary Ann Ryan, Kristine Reopell
Department Of Physics Newsletter: Spring 2001, Gerry Peterson, Bob Krotkov, Mary Ann Ryan, Kristine Reopell
Physics Newsletters
No abstract provided.
On-Line Matrix Removal Of Lead For The Determination Of Trace Elements In Forensic Bullet Samples By Flow Injection Inductively Coupled Plasma-Mass Spectrometry, Er Yourd, Jf Tyson, Rd Koons
On-Line Matrix Removal Of Lead For The Determination Of Trace Elements In Forensic Bullet Samples By Flow Injection Inductively Coupled Plasma-Mass Spectrometry, Er Yourd, Jf Tyson, Rd Koons
Chemistry Department Faculty Publication Series
No abstract provided.
Microwave-Assisted Extraction Of Monomethyl Arsonic Acid From Soil And Sediment Standard Reference Materials, Pm Yehl, H Gurleyuk, Jf Tyson, Pc Uden
Microwave-Assisted Extraction Of Monomethyl Arsonic Acid From Soil And Sediment Standard Reference Materials, Pm Yehl, H Gurleyuk, Jf Tyson, Pc Uden
Chemistry Department Faculty Publication Series
No abstract provided.
Statistical Equilibrium Measures In Micromagnetics, Ma Katsoulakis, P Plechac
Statistical Equilibrium Measures In Micromagnetics, Ma Katsoulakis, P Plechac
Mathematics and Statistics Department Faculty Publication Series
We derive an equilibrium statistical theory for the macroscopic description of a ferromagnetic material at positive finite temperatures. Our formulation describes the most-probable equilibrium macrostates that yield a coherent deterministic large-scale picture varying at the size of the domain, as well as it captures the effect of random spin fluctuations caused by the thermal noise. We discuss connections of the proposed formulation to the Landau-Lifschitz theory and to the studies of domain formation based on Monte Carlo lattice simulations.
Phenomenological Issues In The Determination Of Delta Gamma(D), E Golowich, S Pakvasa
Phenomenological Issues In The Determination Of Delta Gamma(D), E Golowich, S Pakvasa
Physics Department Faculty Publication Series
We consider the issue of determining the D0– width difference ΔΓD experimentally. The current situation is reviewed and suggestions for further study are given. We propose a number of D0 decay modes in addition to those studied in the recent E791, FOCUS and BELLE lifetime determination experiments. Then we address prospects for determining CF-CDS strong phase differences, like δKπ which appears in the CLEO study of D0→K+π− transitions. We show how to extract δK*π with CDS data and furthermore show when D→KLπ data becomes available that δKπ can also be obtained.
Worm Algorithms For Classical Statistical Models, Nikolai Prokof'ev, Boris Svistunov
Worm Algorithms For Classical Statistical Models, Nikolai Prokof'ev, Boris Svistunov
Physics Department Faculty Publication Series
We show that high-temperature expansions provide a basis for the novel approach to efficient Monte Carlo simulations. “Worm” algorithms utilize the idea of updating closed-path configurations (produced by high-temperature expansions) through the motion of end points of a disconnected path. An amazing result is that local, Metropolis-type schemes using this approach appear to have dynamical critical exponents close to zero (i.e., their efficiency is comparable to the best cluster methods) as proved by finite-size scaling of the autocorrelation time for various universality classes.
Single-Hole Spectral Function And Spin-Charge Separation In The T-J Model, A Mishchenko, Nikolai Prokof'ev, Boris Svistunov
Single-Hole Spectral Function And Spin-Charge Separation In The T-J Model, A Mishchenko, Nikolai Prokof'ev, Boris Svistunov
Physics Department Faculty Publication Series
Worm algorithm Monte Carlo simulations of the hole Green function with subsequent spectral analysis were performed for 0.1<~J/t<~0.4 on lattices with up to L×L=32×32 sites at a temperature as low as T=J/40, and present, apparently, the hole spectral function in the thermodynamic limit. Spectral analysis reveals a δ-function-sharp quasiparticle peak at the lower edge of the spectrum that is incompatible with the power-law singularity and thus rules out the possibility of spin-charge separation in this parameter range. Spectral continuum features two peaks separated by a gap ∼4÷5 t.
Diagrammatic Quantum Monte Carlo For Two-Body Problems: Applied To Excitons, E Burovski, A Mishchenko, Nikolai Prokof'ev, B Svistunov
Diagrammatic Quantum Monte Carlo For Two-Body Problems: Applied To Excitons, E Burovski, A Mishchenko, Nikolai Prokof'ev, B Svistunov
Physics Department Faculty Publication Series
We present a novel method for the precise numeric solution of the irreducible two-body problem and apply it to excitons in solids. The approach is based on the Monte Carlo simulation of the two-body Green function specified by Feynman’s diagrammatic expansion. Our method does not rely on the specific form of the electron and hole dispersion laws and is valid for any attractive electron-hole potential. We establish limits of validity of the Wannier (large radius) and Frenkel (small radius) approximations, present accurate data for the intermediate radius excitons, and give evidence for the charge transfer nature of the monopolar exciton …
Calibrations And Fayyazuddin-Smith Spacetimes, Hyunji Cho, Moataz Emam, David Kastor, Jennie Traschen
Calibrations And Fayyazuddin-Smith Spacetimes, Hyunji Cho, Moataz Emam, David Kastor, Jennie Traschen
Physics Department Faculty Publication Series
We show that a class of spacetimes introduced by Fayyazuddin and Smith to describe intersecting M5-branes admits a generalized Kähler calibration. Equipped with this understanding, we are able to construct spacetimes corresponding to further classes of calibrated p-brane world-volume solitons. We note that these classes of spacetimes also describe the fields of p-branes wrapping certain supersymmetric cycles of Calabi-Yau manifolds.
Subleading Corrections To Parity-Violating Pion Photoproduction, Sl Zhu, S Puglia, Br Holstein, Mj Ramsey-Musolf
Subleading Corrections To Parity-Violating Pion Photoproduction, Sl Zhu, S Puglia, Br Holstein, Mj Ramsey-Musolf
Physics Department Faculty Publication Series
We compute the photon asymmetry Bγ for near threshold parity-violating (PV) pion photoproduction through subleading order. We show that subleading contributions involve a new combination of PV couplings not included in previous analyses of hadronic PV. We argue that existing constraints on the leading order contribution to Bγ—obtained from the PV γ-decay of 18F—suggest that the impact of the subleading contributions may be more significant than expected from naturalness arguments.
Introduction To Effective Field Theory, Br Holstein
Introduction To Effective Field Theory, Br Holstein
Physics Department Faculty Publication Series
This review summarizes effective field theory techniques, which are the modern theoretical tools for exploiting the existence of hierarchies of scale in a physical problem. The general theoretical framework is described and evaluated explicitly for a simple model. Power-counting results are illustrated for a few cases of practical interest, and several applications to quantum electrodynamics are described.
Chiral Symmetry And The Parity-Violating Nn Pi Yukawa Coupling, Sl Zhu, Sj Puglia, Br Holstein, Mj Ramsey-Musolf
Chiral Symmetry And The Parity-Violating Nn Pi Yukawa Coupling, Sl Zhu, Sj Puglia, Br Holstein, Mj Ramsey-Musolf
Physics Department Faculty Publication Series
We construct the complete SU(2) parity-violating (PV) π,N,Δ interaction Lagrangian with one derivative, and calculate the chiral corrections to the PV Yukawa NNπ coupling constant hπ through O(1/Λχ3) in the leading order of heavy baryon expansion. We discuss the relationship between the renormalized hπ, the measured value of hπ, and the corresponding quantity calculated microscopically from the standard model four-quark PV interaction. We observe that the renormalized hπ depends strongly on a number of a priori unknown parameters in the PV effective Lagrangian.