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Full-Text Articles in Physics
The Sub-Eddington Boundary For The Quasar Mass–Luminosity Plane: A Theoretical Perspective, David Garofalo, Damian J. Christian, Andrew M. Jones
The Sub-Eddington Boundary For The Quasar Mass–Luminosity Plane: A Theoretical Perspective, David Garofalo, Damian J. Christian, Andrew M. Jones
Faculty and Research Publications
By exploring more than sixty thousand quasars from the Sloan Digital Sky Survey Data Release 5, Steinhardt & Elvis discovered a sub-Eddington boundary and a redshift-dependent drop-off at higher black hole mass, possible clues to the growth history of massive black holes. Our contribution to this special issue of Universe amounts to an application of a model for black hole accretion and jet formation to these observations. For illustrativepurposes,we include~100,000 data points from the Sloan Digital Sky Survey Data Release 7 where the sub-Eddington boundary is also visible andpropose a theoretical picture that explains these features. By appealing to thin …
Self-Consistent Quantum-Kinetic Theory For Interplay Between Pulsed-Laser Excitation And Nonlinear Carrier Transport In A Quantum-Wire Array, Jeremy R. Gulley, Danghong Huang
Self-Consistent Quantum-Kinetic Theory For Interplay Between Pulsed-Laser Excitation And Nonlinear Carrier Transport In A Quantum-Wire Array, Jeremy R. Gulley, Danghong Huang
Faculty and Research Publications
We propose a self-consistent many-body theory for coupling the ultrafast dipole-transition and carrier-plasma dynamics in a linear array of quantum wires with the scattering and absorption of ultrashort laser pulses. The quantum-wire non-thermal carrier occupations are further driven by an applied DC electric field along the wires in the presence of resistive forces from intrinsic phonon and Coulomb scattering of photo-excited carriers. The same strong DC field greatly modifies the non-equilibrium properties of the induced electron-hole plasma coupled to the propagating light pulse, while the induced longitudinal polarization fields of each wire significantly alters the nonlocal optical response from neighboring …
Search For X(3872) And X(3915) Decay Into Χc1Π0 In B Decays At Belle, The Belle Collaboration, Luminda Kulasiri
Search For X(3872) And X(3915) Decay Into Χc1Π0 In B Decays At Belle, The Belle Collaboration, Luminda Kulasiri
Faculty and Research Publications
We report a search for X(3872) and X (3915) in B+→χc1π0K+ decays. We set an upper limit of B(B+→X(3872)K+)×B(X(3872)→χc1π0)<8.1×10−6 and B(B+→X(3915)K+)×B(X(3915)→χc1π0)<3.8×10−5 at 90% confidence level. We also measure B(X(3872)→χc1π0)/B(X(3872)→J/ψπ+π−)<0.97 at 90% confidence level. The results reported here are obtained from 772×106 B¯B events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.
Fr0 Radio Galaxies And Their Place In The Radio Morphology Classification, David Garofalo, Chandra B. Singh
Fr0 Radio Galaxies And Their Place In The Radio Morphology Classification, David Garofalo, Chandra B. Singh
Faculty and Research Publications
So-called FR0 radio galaxies have recently emerged as a family of active galaxies with all the same properties as FRI radio galaxies except for their ratio of core to total emission, which is about 30 times higher than that of FRI sources. We show how their properties fit within the gap paradigm as low, prograde, spinning black holes whose progenitors are powerful FRII quasars that transitioned rapidly from the cold mode into advection-dominated accretion over a few million years. The prediction is that if sufficient fuel exists, FR0 radio galaxies will evolve into full-fledged FRI radio galaxies and the observational …
Unpinning The Skyrmion Lattice In Mnsi: Effect Of Substitutional Disorder, Chetan Dhital, L. Debeer-Schmitt, D. P. Young, J. F. Ditusa
Unpinning The Skyrmion Lattice In Mnsi: Effect Of Substitutional Disorder, Chetan Dhital, L. Debeer-Schmitt, D. P. Young, J. F. Ditusa
Faculty and Research Publications
By employing magnetization and small angle neutron scattering measurements, we have investigated the behavior of the skyrmion lattice (SKL) and the helical order in MnS i 0 . 992 G a 0 . 008 Our results indicate that the order of the SKL is sensitive to the orientation of an applied magnetic field with respect to the crystal lattice and to variations in the sequence of small temperature and applied magnetic field changes. The disorder caused by the substitution of the heavier element Ga for Si is sufficient to reduce the pinning of the SKL to the underlying crystalline lattice, …