Peter Mészáros (PSU) Continue reading Talk: GRBs – Recent developments from Fermi
- (abs, pdf) Rocha et al., Infall Times for Milky Way Satellites From Their Present-Day Kinematics
- (abs, pdf) Trenti et al., Overdensities of Y-dropout Galaxies from the Brightest-of-Reionizing Galaxies Survey: A Candidate Protocluster at Redshift z~8
- (abs, pdf) Petkova & Maio, Radiative feedback on early molecular gas and implications for primordial structure formation
- (abs, pdf) Maio & Khochfar, The imprint of cosmological non-Gaussianities on primordial structure formation
- (abs, pdf) Bolton et al., Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6
- (abs, pdf) Pan et al., The Pollution of Pristine Material in Compressible Turbulence
- (abs, pdf) Mignone et al., Adaptive Mesh Refinement with the PLUTO Code for Astrophysical Fluid Dynamics
Lionel London (CRA) – GPU Computing in Matlab
- Matlab Parallel Computing Toolbox (PCT) vs. Jacket
- PCT allows for multi-cpu and GPU computing. Limited to 12 cores on the local machine. Very high level.
- GPU computing with PCT requires an nVidia card with v1.3 compute capabilities. GPGPU with Jacket has relaxed requirements but is very expensive ($4k for 5 licenses!)
- PCT GPU can run external .cu files.
- Jacket has 10x more CUDA-enabled functions than Matlab. It’s cluster capable.
Yesterday I attended a discussion with Michael Nielsen and the GT faculty, where open science was the subject. We covered various venues for promoting collaborative science projects. Some were completely new to me. Let’s cover a few examples that were discussed. Continue reading Discussion: Doing Science in the Open
Kostas Kokkotas (Tübingen)
- Magnetars exhibit regular gamma-ray flares that are preceded by star quakes or glitches in the pulsations. The largest flares have L ~ 10^47 erg/s (3 since 1979).
- No natural explanation for (1) sudden stop of activity P ~ 12 sec and (2) AXP-SNR association but no SGR-SNR association
- Thompson & Duncan (1990’s) – developed a fireball model that erupts from the NS surface to explain these largest bursts.
- Can QPOs be explained by global Alfvèn waves? (see KK publications)
- NS models, using perturbation theory, with crust and B-fields to predict QPO frequencies. No crust oscillations at B > 4 x 10^14 G.
- Gravitational wave amplitudes are unknown and must be calculated with simulations (3D GRMHD).
- Simulation of B-field instability (Lasky et al. 2011, ApJL) and prediction for GW (Zink et al. 2011)
- (abs, pdf) Pritchard & Loeb, 21-cm cosmology
- (abs, pdf) Lin et al., Large-Scale High-Lundquist Number Reduced MHD Simulations of the Solar Corona Using GPU Accelerated Machines
- (abs, pdf) Maeder & Meynet, Rotating massive stars through the ages, with applications to WR stars, Pop III stars and Gamma Ray Bursts