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  • Electronic structure and strongly correlated systems  (4)
  • DOCUMENTATION AND INFORMATION SCIENCE  (3)
  • Astrophysics
  • Mice
  • 2015-2019  (6)
  • 1990-1994  (3)
  • 1
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    Hastatic order in URu_{2}Si_{2}: Hybridization with a twist (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-05-08
    Description: Author(s): Premala Chandra, Piers Coleman, and Rebecca Flint The broken symmetry that develops below 17.5 K in the heavy fermion compound URu 2 Si 2 has long eluded identification. Here we argue that the recent observation of Ising quasiparticles in URu 2 Si 2 results from a spinor hybridization order parameter that breaks double time-reversal symmetry by mixing st... [Phys. Rev. B 91, 205103] Published Thu May 07, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Majorana approach to the stochastic theory of line shapes (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-09
    Description: Author(s): Yashar Komijani and Piers Coleman Motivated by recent Mössbauer experiments on strongly correlated mixed-valence systems, we revisit the Kubo-Anderson stochastic theory of spectral line shapes. Using a Majorana representation for the nuclear spin we demonstrate how to recast the classic line-shape theory in a field-theoretic and dia… [Phys. Rev. B 94, 085113] Published Mon Aug 08, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Supersymmetric approach to heavy fermion systems (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-01-21
    Description: Author(s): Aline Ramires and Piers Coleman We propose a generalization of the supersymmetric representation of spins with symplectic symmetry, generalizing the rotation group of the spin from SU(2) to Sp( N ). As a test application of this representation, we consider two toy models involving a competition of the Kondo effect and antiferromagne… [Phys. Rev. B 93, 035120] Published Tue Jan 19, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Parity-violating hybridization in heavy Weyl semimetals (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-04-18
    Description: Author(s): Po-Yao Chang and Piers Coleman We introduce a simple model to describe the formation of heavy Weyl semimetals in noncentrosymmetric heavy fermion compounds under the influence of a parity-mixing, onsite hybridization. A key aspect of interaction-driven heavy Weyl semimetals is the development of surface Kondo breakdown, which is ... [Phys. Rev. B 97, 155134] Published Tue Apr 17, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Storage needs in future supercomputer environments (1992)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The Lawrence Livermore National Laboratory (LLNL) is a Department of Energy contractor, managed by the University of California since 1952. Major projects at the Laboratory include the Strategic Defense Initiative, nuclear weapon design, magnetic and laser fusion, laser isotope separation, and weather modeling. The Laboratory employs about 8,000 people. There are two major computer centers: The Livermore Computer Center and the National Energy Research Supercomputer Center. As we increase the computing capacity of LLNL systems and develop new applications, the need for archival capacity will increase. Rather than quantify that increase, I will discuss the hardware and software architectures that we will need to support advanced applications.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications, Volume 3; 13 p
    Format: text
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  • 6
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    Storage needs in future supercomputer environments (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As the computing capacity of the Lawrence Livermore National Laboratory (LLNL) systems is increased and new applications are developed, the need for archival capacity will increase. The hardware and software architectures that will be needed to support advanced applications are discussed. Viewgraphs are included.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Proceedings of the NSSDC Conference on Mass Storage Systems and Technologies for Space and Earth Science Applications; p 276-295
    Format: application/pdf
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  • 7
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    Mass storage system reference model, Version 4 (1993)
    In:  Other Sources
    Details
    Publication Date: 2016-03-10
    Description: The high-level abstractions that underlie modern storage systems are identified. The information to generate the model was collected from major practitioners who have built and operated large storage facilities, and represents a distillation of the wisdom they have acquired over the years. The model provides a common terminology and set of concepts to allow existing systems to be examined and new systems to be discussed and built. It is intended that the model and the interfaces identified from it will allow and encourage vendors to develop mutually-compatible storage components that can be combined to form integrated storage systems and services. The reference model presents an abstract view of the concepts and organization of storage systems. From this abstraction will come the identification of the interfaces and modules that will be used in IEEE storage system standards. The model is not yet suitable as a standard; it does not contain implementation decisions, such as how abstract objects should be broken up into software modules or how software modules should be mapped to hosts; it does not give policy specifications, such as when files should be migrated; does not describe how the abstract objects should be used or connected; and does not refer to specific hardware components. In particular, it does not fully specify the interfaces.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, Goddard Conference on Mass Storage Systems and Technologies, Volume 1,; p 1-72
    Format: text
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  • 8
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    On the Persistence of QPOs During the SGR 1806-20 Giant Flare (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-07-09
    Description: The discovery of quasi-periodic brightness oscillations (QPOs) in the X-ray emission accompanying the giant flares of the soft gamma-ray repeaters SGR 180620 and SGR 1900+14 has led to intense speculation about their nature and what they might reveal about the interiors of neutron stars. Here we take a fresh look at the giant flare data for SGR 180620, and in particular we analyze short segments of the post-peak emission using a Bayesian procedure, which has not previously been applied to these data. We find at best weak evidence that any QPO persists for more than ~1 s; instead, almost all the data are consistent with a picture in which there are numerous independently excited modes that decay within a few tenths of a second. This has interesting implications for the rapidity of decay of the QPO modes, which could occur by the previously suggested mechanism of coupling to the MHD continuum. The strongest QPOs favor certain rotational phases, which might suggest special regions of the crust or of the magnetosphere. We also find several previously unreported QPOs in these data, which may help in tracking down their origin.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN68610 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 871; 1; 95
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  • 9
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    A Search for High-Energy Counterparts to Fast Radio Bursts (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-11-30
    Description: We report on a search for high-energy counterparts to fast radio bursts (FRBs) with the Fermi Gamma-ray Burst Monitor, Fermi Large Area Telescope, and the Neil Gehrels Swift Observatory Burst Alert Telescope. We find no significant associations for any of the 23 FRBs in our sample, but report upper limits to the high-energy fluence for each on timescales of 0.1, 1, 10, and 100 s. We report lower limits on the ratio of the radio to high-energy fluence, f(sub r) /f(sub ), for timescales of 0.1 and 100 s. We discuss the implications of our non-detections on various proposed progenitor models for FRBs, including analogs of giant pulses from the Crab pulsar and hyperflares from magnetars. This work demonstrates the utility of analyses of high-energy data for FRBs in tracking down the nature of these elusive sources..
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN75257 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 879; 1; 40
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