Institution
Leibniz University of Hanover
Education•Hanover, Niedersachsen, Germany•
About: Leibniz University of Hanover is a education organization based out in Hanover, Niedersachsen, Germany. It is known for research contribution in the topics: Finite element method & Computer science. The organization has 14283 authors who have published 29845 publications receiving 682152 citations.
Papers published on a yearly basis
Papers
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TL;DR: The total background may be detectable with a signal-to-noise-ratio of 3 after 40 months of total observation time, based on the expected timeline for Advanced LIGO and Virgo to reach their design sensitivity.
Abstract: The LIGO Scientific and Virgo Collaborations have announced the event GW170817, the first detection of gravitational waves from the coalescence of two neutron stars. The merger rate of binary neutron stars estimated from this event suggests that distant, unresolvable binary neutron stars create a significant astrophysical stochastic gravitational-wave background. The binary neutron star component will add to the contribution from binary black holes, increasing the amplitude of the total astrophysical background relative to previous expectations. In the Advanced LIGO-Virgo frequency band most sensitive to stochastic backgrounds (near 25 Hz), we predict a total astrophysical background with amplitude ΩGW(f=25 Hz)=1.8
+2.7
−1.3×10−9 with 90% confidence, compared with ΩGW(f=25 Hz)=1.1
+1.2
−0.7×10−9 from binary black holes alone. Assuming the most probable rate for compact binary mergers, we find that the total background may be detectable with a signal-to-noise-ratio of 3 after 40 months of total observation time, based on the expected timeline for Advanced LIGO and Virgo to reach their design sensitivity.
218 citations
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TL;DR: In this paper, the mass of the dynamical ejecta can be estimated without a direct electromagnetic observation of the kilonova, using GW measurements and a phenomenological model calibrated to numerical simulations of mergers with dynamical ejecteda.
Abstract: The source of the gravitational-wave (GW) signal GW170817, very likely a binary neutron star merger, was also
observed electromagnetically, providing the first multi-messenger observations of this type. The two-week-long
electromagnetic (EM) counterpart had a signature indicative of an r-process-induced optical transient known as a
kilonova. This Letter examines how the mass of the dynamical ejecta can be estimated without a direct
electromagnetic observation of the kilonova, using GW measurements and a phenomenological model calibrated to
numerical simulations of mergers with dynamical ejecta. Specifically, we apply the model to the binary masses
inferred from the GW measurements, and use the resulting mass of the dynamical ejecta to estimate its contribution
(without the effects of wind ejecta) to the corresponding kilonova light curves from various models. The
distributions of dynamical ejecta mass range between = - - - M M ej 10 10
3 2 for various equations of state,
assuming that the neutron stars are rotating slowly. In addition, we use our estimates of the dynamical ejecta mass
and the neutron star merger rates inferred from GW170817 to constrain the contribution of events like this to the
r-process element abundance in the Galaxy when ejecta mass from post-merger winds is neglected. We find that if
10% of the matter dynamically ejected from binary neutron star (BNS) mergers is converted to r-process
elements, GW170817-like BNS mergers could fully account for the amount of r-process material observed in the
Milky Way.
217 citations
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TL;DR: This is the first description of intracellular SbV reducing activity in Leishmania as well as in any prokaryotic or eukaryotic cell and demonstrates that the interaction between the two antimony oxidation states occurs intrACEllularly, within the parasite.
217 citations
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TL;DR: In this article, the authors investigated the energy imbalance problem of single-tower measurements and the mechanism of the so-called energy imbalance through numerical experiments using large-eddy simulation (LES) for the daytime atmospheric boundary layer heated over a flat surface.
Abstract: The spatial representativeness of heat fluxes on the basis of single-tower measurements, and the mechanism of the so-called energy imbalance problem, are investigated through numerical experiments using large-eddy simulation (LES). LES experiments are done for the daytime atmospheric boundary layer heated over a flat surface, as a best-case scenario completely free of sensor errors and the uncertainties of field conditions. Imbalance is defined as the deviation of the `turbulent' heat flux at a grid point from the horizontally averaged `total' heat flux. Both the theoretical and numerical results of the present study suggest the limitation of single-tower measurements and the necessity of horizontally-distributed observation networks. The temporally averaged `turbulent' flux based on a point measurement systematically underestimates the `total' flux (negative imbalance). This is attributed to local advection effects caused by the existence of turbulent organized structures (TOS), whose time scale is much longer than that of thermal plumes. The temporal and spatial change of TOS patterns causes low-frequency trends in the velocity and temperature data resulting in large scatter of the flux estimates. The influences of geostrophic wind speed, averaging time, observation height, computational domain size and resolution on tower-measured fluxes are also discussed. Finally, it is suggested that a weak inhomogenity in surface heating may reduce the negative bias of flux estimates.
216 citations
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TL;DR: The realization of quantum magnetism using a degenerate dipolar gas in an optical lattice characterized by a nonequilibrium spinor dynamics resulting from intersite Heisenberg-like spin-spin interactions provided by nonlocal dipole-dipole interactions is reported.
Abstract: We report on the realization of quantum magnetism using a degenerate dipolar gas in an optical lattice. Our system implements a lattice model resembling the celebrated t-J model. It is characterized by a nonequilibrium spinor dynamics resulting from intersite Heisenberg-like spin-spin interactions provided by nonlocal dipole-dipole interactions. Moreover, due to its large spin, our chromium lattice gases constitute an excellent environment for the study of quantum magnetism of high-spin systems, as illustrated by the complex spin dynamics observed for doubly occupied sites.
216 citations
Authors
Showing all 14621 results
Name | H-index | Papers | Citations |
---|---|---|---|
Hyun-Chul Kim | 176 | 4076 | 183227 |
Peter Zoller | 134 | 734 | 76093 |
J. R. Smith | 134 | 1335 | 107641 |
Chao Zhang | 127 | 3119 | 84711 |
Benjamin William Allen | 124 | 807 | 87750 |
J. F. J. van den Brand | 123 | 777 | 93070 |
J. H. Hough | 117 | 904 | 89697 |
Hans-Peter Seidel | 112 | 1213 | 51080 |
Karsten Danzmann | 112 | 754 | 80032 |
Bruce D. Hammock | 111 | 1409 | 57401 |
Benno Willke | 109 | 508 | 74673 |
Roman Schnabel | 108 | 589 | 71938 |
Jan Harms | 108 | 447 | 76132 |
Hartmut Grote | 108 | 434 | 72781 |
Ik Siong Heng | 107 | 423 | 71830 |