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- Pennsylvania State UniversityUS549 papers
- Center for Astrophysics Harvard & SmithsonianUS391 papers
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87 papers · 1 filter
Measurement of air and nitrogen fluorescence light yields induced by electron beam for UHECR experiments
P. Colin, A. Chukanov, V. Grebenyuk +7
Most of the Ultra High Energy Cosmic Ray (UHECR) experiments and projects (HiRes, AUGER, TA, EUSO, TUS,...) use air fluorescence to detect and measure extensive air showers (EAS).…
Effect of electron-electron interactions on the conductivity of clean graphene
E. G. Mishchenko
Minimal conductivity of a single undoped graphene layer is known to be of the order of the conductance quantum, independent of the electron velocity. We show that this universality…
Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope
A. Konopelko, R. W. Atkins, G. Blaylock +58
We report on observations of the sky region around the unidentified TeV gamma-ray source TeV J2032+4130 carried out with the Whipple Observatory 10 m atmospheric Cherenkov telescop…
Rectangular Layouts and Contact Graphs
Adam L. Buchsbaum, Emden R. Gansner, Cecilia M. Procopiuc +1
Contact graphs of isothetic rectangles unify many concepts from applications including VLSI and architectural design, computational geometry, and GIS. Minimizing the area of their…
Mean-field theory for Heisenberg zigzag ladder: Ground state energy and spontaneous symmetry breaking
V. V. Mkhitaryan, T. A. Sedrakyan
The spin-1/2 zig-zag Heisenberg ladder (J_1 - J_2 model) is considered. A new representation for the model is found and a saddle point approximation over the spin-liquid order para…
Annihilators of Local Cohomology in Characteristic Zero
Paul Roberts, Anurag K. Singh, V. Srinivas
This paper discusses the problem of whether it is possible to annihilate elements of local cohomology modules by elements of arbitrarily small order under a fixed valuation. We fir…