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Title:

Gravitational waves from relativistic rotational core collapse

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We present results from simulations of axisymmetric relativistic rotational core collapse. The general relativistic hydrodynamic equations are formulated in flux-conservative form and solved using a high-resolution shock-capturing scheme. The Einstein equations are approximated with a conformally flat 3-metric. We use the quadrupole formula to e...

We present results from simulations of axisymmetric relativistic rotational core collapse. The general relativistic hydrodynamic equations are formulated in flux-conservative form and solved using a high-resolution shock-capturing scheme. The Einstein equations are approximated with a conformally flat 3-metric. We use the quadrupole formula to extract waveforms of the gravitational radiation emitted during the collapse. A comparison of our results with those of Newtonian simulations shows that the wave amplitudes agree within 30%. Surprisingly, in some cases, relativistic effects actually diminish the amplitude of the gravitational wave signal. We further find that the parameter range of models suffering multiple coherent bounces due to centrifugal forces is considerably smaller than in Newtonian simulations. ; Comment: 4 pages, 3 figures Minimize

Year of Publication:

2001-03-06

Document Type:

text

Subjects:

Astrophysics ; General Relativity and Quantum Cosmology

Astrophysics ; General Relativity and Quantum Cosmology Minimize

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Title:

Relativistic simulations of rotational core collapse. I. Methods, initial models, and code tests

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We describe an axisymmetric general relativistic code for rotational core collapse. The code evolves the coupled system of metric and fluid equations using the ADM 3+1 formalism and a conformally flat metric approximation of the Einstein equations. The relativistic hydrodynamics equations are formulated as a first-order flux-conservative hyperbo...

We describe an axisymmetric general relativistic code for rotational core collapse. The code evolves the coupled system of metric and fluid equations using the ADM 3+1 formalism and a conformally flat metric approximation of the Einstein equations. The relativistic hydrodynamics equations are formulated as a first-order flux-conservative hyperbolic system and are integrated using high-resolution shock-capturing schemes based on Riemann solvers. We assess the quality of the conformally flat metric approximation for relativistic core collapse and present a comprehensive set of tests which the code successfully passed. The tests include relativistic shock tubes, the preservation of the rotation profile and of the equilibrium of rapidly and differentially rotating neutron stars (approximated as rotating polytropes), spherical relativistic core collapse, and the conservation of rest-mass and angular momentum in dynamic spacetimes. The application of the code to relativistic rotational core collapse, with emphasis on the gravitational waveform signature, is presented in an accompanying paper. ; Comment: 18 pages, 12 figures Minimize

Year of Publication:

2002-04-17

Document Type:

text

Subjects:

Astrophysics ; General Relativity and Quantum Cosmology

Astrophysics ; General Relativity and Quantum Cosmology Minimize

DDC:

115 Time *(computed)*

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Title:

Relativistic simulations of rotational core collapse. II. Collapse dynamics and gravitational radiation

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We have performed hydrodynamic simulations of relativistic rotational supernova core collapse in axisymmetry and have computed the gravitational radiation emitted by such an event. Details of the methodology and of the numerical code have been given in an accompanying paper. We have simulated the evolution of 26 models in both Newtonian and rela...

We have performed hydrodynamic simulations of relativistic rotational supernova core collapse in axisymmetry and have computed the gravitational radiation emitted by such an event. Details of the methodology and of the numerical code have been given in an accompanying paper. We have simulated the evolution of 26 models in both Newtonian and relativistic gravity. Our simulations show that the three different types of rotational supernova core collapse and gravitational waveforms identified in previous Newtonian simulations (regular collapse, multiple bounce collapse, and rapid collapse) are also present in relativistic gravity. However, rotational core collapse with multiple bounces is only possible in a much narrower parameter range in relativistic gravity. The relativistic models cover almost the same range of gravitational wave amplitudes and frequencies as the corresponding Newtonian ones. For a given model, relativistic gravity can cause a large increase of the characteristic signal frequency of up to a factor of five, which may have important consequences for the signal detection. The gravitational wave signals obtained in our study are within the sensitivity range of the first generation laser interferometer detectors if the source is located within the Local Group. ; Comment: 21 pages, 19 figures Minimize

Year of Publication:

2002-04-17

Document Type:

text

Subjects:

Astrophysics ; General Relativity and Quantum Cosmology

Astrophysics ; General Relativity and Quantum Cosmology Minimize

DDC:

115 Time *(computed)*

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Title:

Isospin Symmetry Breaking and the $\rho-\omega$-System

Description:

Simple quark models for the low lying vector mesons suggest a mixing between the u- and d-flavors and a violation of the isospin symmetry for the $\rho-\omega$- system much stronger than observed. It is shown that the chiral dynamics, especially the QCD anomaly, is responsible for a restoration of the isospin symmetry in the $\rho-\omega$-system.

Simple quark models for the low lying vector mesons suggest a mixing between the u- and d-flavors and a violation of the isospin symmetry for the $\rho-\omega$- system much stronger than observed. It is shown that the chiral dynamics, especially the QCD anomaly, is responsible for a restoration of the isospin symmetry in the $\rho-\omega$-system. Minimize

Year of Publication:

2000-11-22

Language:

eng

Subjects:

Particle Physics - Phenomenology

Particle Physics - Phenomenology Minimize

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Title:

Nucleotide sequence of a full-length cDNA coding for the mitochondrial precursor protein of the {beta}-subunit of F1-ATPase from Neurospora crassa

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Publisher:

Oxford University Press

Year of Publication:

1990-08-25 00:00:00.0

Document Type:

TEXT

Language:

en

Subjects:

FOR THE RECORD SEQUENCE

FOR THE RECORD SEQUENCE Minimize

Rights:

Copyright (C) 1990, Oxford University Press

Copyright (C) 1990, Oxford University Press Minimize

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Title:

Biocatalytic hydroxylation of n-butane with in situ cofactor regeneration at low temperature and under normal pressure

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The hydroxylation of n-alkanes, which proceeds in the presence of a P450-monooxygenase advantageously at temperatures significantly below room temperature, is described. In addition, an enzymatic hydroxylation of the “liquid gas” n-butane with in situ cofactor regeneration, which does not require high-pressure conditions, was developed. The resu...

The hydroxylation of n-alkanes, which proceeds in the presence of a P450-monooxygenase advantageously at temperatures significantly below room temperature, is described. In addition, an enzymatic hydroxylation of the “liquid gas” n-butane with in situ cofactor regeneration, which does not require high-pressure conditions, was developed. The resulting 2-butanol was obtained as the only regioisomer, at a product concentration of 0.16 g/L. Minimize

Publisher:

Beilstein-Institut

Year of Publication:

2012-02-02

Document Type:

Text

Language:

en

Subjects:

Letter

Letter Minimize

Rights:

Copyright © 2012, Staudt et al; licensee Beilstein-Institut. ; http://www.beilstein-journals.org/bjoc ; This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work i...

Copyright © 2012, Staudt et al; licensee Beilstein-Institut. ; http://www.beilstein-journals.org/bjoc ; This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (http://www.beilstein-journals.org/bjoc) Minimize

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Title:

Max-Planck-Institut für ausländisches öffentliches Recht

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Als Mitglied des IFLA Copyright and Other Legal Matters Committee (IFLA CLM) habe ich zunächst einmal die zwei internen Sitzungen, sowie dann die öffentlichen Vortragsveranstaltung besucht. Die nicht wenigen europäischen Mitglieder von IFLA CLM sind zugleich auch in der EBLIDA Experts Group for Information Law (EGIL) tätig. So ist eine kontinuie...

Als Mitglied des IFLA Copyright and Other Legal Matters Committee (IFLA CLM) habe ich zunächst einmal die zwei internen Sitzungen, sowie dann die öffentlichen Vortragsveranstaltung besucht. Die nicht wenigen europäischen Mitglieder von IFLA CLM sind zugleich auch in der EBLIDA Experts Group for Information Law (EGIL) tätig. So ist eine kontinuierliche Bearbeitung aktueller, besonders den europäischen Bibliotheksbereich betreffender Rechtsfragen sicher gestellt. Das IFLA CLM traf sich zu ihrer ersten Sitzung in Quebec am 9. August 2008 von 14.30 h bis 17.30 h. Nach den üblichen Formalien beschäftigte sich die Runde sehr intensiv mit folgenden Themen: Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2011-03-17

Source:

http://www.ifla-deutschland.de/de/downloads/bericht_ifla_mueller.pdf

http://www.ifla-deutschland.de/de/downloads/bericht_ifla_mueller.pdf Minimize

Document Type:

text

Language:

en

Subjects:

c. IFLA IFRRO Cooperation

c. IFLA IFRRO Cooperation Minimize

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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(DOI: will be inserted by hand later) Relativistic simulations of rotational core collapse. II. Collapse dynamics and gravitational radiation

(DOI: will be inserted by hand later) Relativistic simulations of rotational core collapse. II. Collapse dynamics and gravitational radiation Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-03

Source:

http://arxiv.org/pdf/astro-ph/0204289v1.pdf

http://arxiv.org/pdf/astro-ph/0204289v1.pdf Minimize

Document Type:

text

Language:

en

Rights:

Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Received date / Accepted date

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(DOI: will be inserted by hand later) Relativistic simulations of rotational core collapse. I. Methods, initial models, and code tests

(DOI: will be inserted by hand later) Relativistic simulations of rotational core collapse. I. Methods, initial models, and code tests Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-03

Source:

http://arxiv.org/pdf/astro-ph/0204288v1.pdf

http://arxiv.org/pdf/astro-ph/0204288v1.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Structures of dolomite at ultrahigh pressure and their influence on the deep carbon cycle

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Carbon-bearing solids, fluids, and melts in the Earth's deep interior may play an important role in the long-term carbon cycle. Here we apply synchrotron X-ray single crystal micro-diffraction techniques to identify and characterize the high-pressure polymorphs of dolomite. Dolomite-II, observed above 17 GPa, is triclinic, and its structure is t...

Carbon-bearing solids, fluids, and melts in the Earth's deep interior may play an important role in the long-term carbon cycle. Here we apply synchrotron X-ray single crystal micro-diffraction techniques to identify and characterize the high-pressure polymorphs of dolomite. Dolomite-II, observed above 17 GPa, is triclinic, and its structure is topologically related to CaCO3-II. It transforms above 35 GPa to dolomite-III, also triclinic, which features carbon in [3 + 1] coordination at the highest pressures investigated (60 GPa). The structure is therefore representative of an intermediate between the low-pressure carbonates and the predicted ultra-high pressure carbonates, with carbon in tetrahedral coordination. Dolomite-III does not decompose up to the melting point (2,600 K at 43 GPa) and its thermodynamic stability demonstrates that this complex phase can transport carbon to depths of at least up to 1,700 km. Dolomite-III, therefore, is a likely occurring phase in areas containing recycled crustal slabs, which are more oxidized and Ca-enriched than the primitive lower mantle. Indeed, these phases may play an important role as carbon carriers in the whole mantle carbon cycling. As such, they are expected to participate in the fundamental petrological processes which, through carbon-bearing fluids and carbonate melts, will return carbon back to the Earth’s surface. Minimize

Publisher:

National Academy of Sciences

Year of Publication:

2012-08-21

Document Type:

Text

Language:

en

Subjects:

Physical Sciences

Physical Sciences Minimize

DDC:

550 Earth sciences *(computed)*

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