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12 papers · 1 filter
TeV mu Neutrinos from Young Neutron Stars
B. Link, Fiorella Burgio
Neutron stars are efficient accelerators for bringing charges up to relativistic energies. We show that if positive ions are accelerated to ~1 PeV near the surface of a young neutr…
Quantum fields and "Big Rip" expansion singularities
Hector Calderon, William A. Hiscock
The effects of quantized conformally invariant massless fields on the evolution of cosmological models containing a ``Big Rip'' future expansion singularity are examined. Quantized…
Giant Dielectric Permittivity of Electron-Doped Manganite Thin Films, Ca(1-x)La(x)MnO(3) ($0<= x<= 0.03)
J. L. Cohn, M. Peterca, J. J. Neumeier
A giant low-frequency, in-plane dielectric constant, eps~10^6, for epitaxial thin films of Ca(1-x)La(x)MnO(3) (x<=0.03) was observed over a broad temperature range, 4K <= T 300K. T…
Low-Temperature Permittivity of Insulating Perovskite Manganites
J. L. Cohn, M. Peterca, J. J. Neumeier
Measurements of the low-frequency (f<=100 kHz) permittivity and conductivity at T<= 150 K are reported for La(1-x)Ca(x)MnO(3) (0<=x<=1) and Ca(1-y)Sr(y)MnO(3) (0<=y<=0.75) having a…
A universal relationship between magnetization and local structure changes below the ferromagnetic transition in La_{1-x}Ca_xMnO_3; evidence for magnetic dimers
L. Downward, F. Bridges, S. Bushart +3
We present extensive X-ray Absorption Fine Structure (XAFS) measurements on La_{1-x}Ca_xMnO_3 as a function of B-field (to 11T) and Ca concentration, x (21-45%). These results reve…
The Origin of Helicity in Solar Active Regions
Arnab Rai Choudhuri, Piyali Chatterjee, Dibyendu Nandy
We present calculations of helicity based on our solar dynamo model and show that the results are consistent with observational data.