Massively Parallel Computation of Accurate Densities for N-body Dark Matter Simulations using the Phase-Space-Element Method

Posted by klaurent Stanford

Kavli Affiliate: Ralf Kaehler | Summary:This paper presents an accurate density computation approach for large dark matter simulations, based on a recently introduced phase-space tessellation technique and designed for massively parallel, heterogeneous cluster architectures. We discuss a memory efficient construction of an oct-tree structure to sample the mass densities with locally adaptive resolution, according to […]


Continue.. Massively Parallel Computation of Accurate Densities for N-body Dark Matter Simulations using the Phase-Space-Element Method

Probing microplasticity in small scale FCC crystals via Dynamic Mechanical Analysis

Posted by klaurent Caltech

Kavli Affiliate: Julia R. Greer | Summary:In small-scale metallic systems, collective dislocation activity has been correlated with size effects in strength and with a step-like plastic response under uniaxial compression and tension. Yielding and plastic flow in these samples is often accompanied by the emergence of multiple dislocation avalanches. Dislocations might be active pre-yield, but […]


Continue.. Probing microplasticity in small scale FCC crystals via Dynamic Mechanical Analysis

A pair of Calabi-Yau manifolds from a two parameter non-Abelian gauged linear sigma model

Posted by klaurent Tokyo

Kavli Affiliate: Kentaro Hori | Summary:We construct and study a two parameter gauged linear sigma model with gauge group $(U(1)^2times O(2))/mathbb Z_2$ that has a dual model with gauge group $(U(1)^2times SO(4))/mathbb Z_2$. The model has two geometric phases, three hybrid phases and one phase whose character is unknown. One of the geometric phases is […]


Continue.. A pair of Calabi-Yau manifolds from a two parameter non-Abelian gauged linear sigma model

Coherent transport properties of a three-terminal hybrid superconducting interferometer

Posted by klaurent Delft

Kavli Affiliate: Yu V. Nazarov | Summary:We present an exhaustive theoretical analysis of a double-loop Josephson proximity interferometer, as the one recently realized by Strambini et al. for the control of the Andreev spectrum via an external magnetic field. This system, called $ω$-SQUIPT, consists of a T-shaped diffusive normal metal (N) attached to three superconductors […]


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Active particle dynamics beyond the jamming density

Posted by klaurent Delft

Kavli Affiliate: Timon Idema | Summary:Many biological systems form colonies at high density. Passive granular systems will be jammed at such densities, yet for the survival of biological systems it is crucial that they are dynamic. We construct a phase diagram for a system of active particles interacting via Vicsek alignment, and vary the density, […]


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SuperCDMS SNOLAB Low-Mass Detectors: Ultra-Sensitive Phonon Calorimeters for a Sub-GeV Dark Matter Search

Posted by klaurent Stanford

Kavli Affiliate: Blas Cabrera | Summary:We present the technical design for the SuperCDMS high-voltage, low-mass dark matter detectors, designed to be sensitive to dark matter down to 300 MeV/$c^2$ in mass and resolve individual electron-hole pairs from low-energy scattering events in high-purity Ge and Si crystals. In this paper we discuss some of the studies […]


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Ultra-Efficient Thermophotovoltaics Exploiting Spectral Filtering by the Photovoltaic Band-Edge

Posted by klaurent Berkeley

Kavli Affiliate: Eli Yablonovitch | Summary:Thermophotovotaics convert thermal radiation from local heat sources to electricity. A new breakthrough in creating highly efficient thin-film solar cells can potentially enable thermophotovoltaic systems with unprecedented high efficiency. The current 28.8% single-junction solar efficiency record, by Alta Devices, was achieved by recognizing that a good solar cell needs to […]


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The DESI Experiment Part II: Instrument Design

Posted by klaurent Stanford

Kavli Affiliate: Kevin Reil | Summary:DESI (Dark Energy Spectropic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey. The DESI instrument is a robotically-actuated, fiber-fed spectrograph capable of taking up to 5,000 simultaneous […]


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The DESI Experiment Part I: Science,Targeting, and Survey Design

Posted by klaurent Stanford

Kavli Affiliate: Kevin Reil | Summary:DESI (Dark Energy Spectroscopic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey. To trace the underlying dark matter distribution, spectroscopic targets will be selected in four […]


Continue.. The DESI Experiment Part I: Science,Targeting, and Survey Design

Accurate Polarization Calibration at 800 MHz with the Green Bank Telescope

Posted by klaurent MIT

Kavli Affiliate: Kiyoshi Wesley Masui | Summary:Polarization leakage of foreground synchrotron emission is a critical issue in HI intensity mapping experiments. While the sought-after HI emission is unpolarized, polarized foregrounds such as Galactic and extragalactic synchrotron radiation, if coupled with instrumental impurity, can mimic or overwhelm the HI signals. In this paper we present the […]


Continue.. Accurate Polarization Calibration at 800 MHz with the Green Bank Telescope