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Full-Text Articles in Physics
A Theory For Stretchiness, Brandon R. Brown
A Theory For Stretchiness, Brandon R. Brown
Physics and Astronomy
No abstract available.
Focus: New Info From Slow Muons, Brandon R. Brown
Focus: New Info From Slow Muons, Brandon R. Brown
Physics and Astronomy
No abstract available.
A Spectroscopic Redshift For The Cl 0024+16 Multiple Arc System: Implications For The Central Mass Distribution, Tom Broadhurst, Xiaosheng Huang, Brenda Frye, Richard Ellis
A Spectroscopic Redshift For The Cl 0024+16 Multiple Arc System: Implications For The Central Mass Distribution, Tom Broadhurst, Xiaosheng Huang, Brenda Frye, Richard Ellis
Physics and Astronomy
We present a spectroscopic redshift of z = 1.675 for the well-known multiply lensed system of arcs seen in the z = 0.39 cluster Cl 0024+16. In contrast to earlier work, we find that the lensed images are accurately reproduced by a projected mass distribution which traces the locations of the brightest cluster elliptical galaxies, suggesting that the most significant minima of the cluster potential are not dynamically erased. The averaged mass profile is shallow and consistent with predictions of recent numerical simulations. The source redshift enables us to determine an enclosed cluster mass of M(<100 kpc h-1) = …
Herding Molecules, Brandon R. Brown
Simulation Of Dc Resistivity Data: Questioning Critical Scaling For The High-Tc Copper Oxides, Brandon R. Brown
Simulation Of Dc Resistivity Data: Questioning Critical Scaling For The High-Tc Copper Oxides, Brandon R. Brown
Physics and Astronomy
We simulate dc V-I data using Gaussian distributions of depinning currents for the mixed state of a copper-oxide superconductor and subsequently submit the data to a critical scaling analysis. Though the simple model for simulation assumes no phase transition for the vortex matter, the generated data exhibit a collapse matching those in the experimental literature. The resulting would-be critical parameters depend on the simulated sensitivity level, reinforcing doubts concerning the utility of the scaling analysis for these systems.
The Optical Depth To Reionization As A Probe Of Cosmological And Astrophysical Parameters, Aparna Venkatesan
The Optical Depth To Reionization As A Probe Of Cosmological And Astrophysical Parameters, Aparna Venkatesan
Physics and Astronomy
Current data of high-redshift absorption-line systems imply that hydrogen reionization occurred before redshifts of about 5. Previous works on reionization by the first stars or quasars have shown that such scenarios are described by a large number of cosmological and astrophysical parameters. Here we adopt a semianalytic model of stellar reionization in order to quantify how the optical depth to reionization depends on such parameters, and combine this with constraints from the cosmic microwave background (CMB). We find this approach to be particularly useful in alleviating the well-known degeneracy in CMB parameter extraction between the optical depth to reionization and …