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7 results for “spiral waves”
The One-Armed Spiral Instability in Neutron Star Mergers and its Detectability in Gravitational Waves
<p>We distribute complete gravitational-wave signals in the Advanced LIGO band (10 Hz - 8192 Hz) of the inspiral and merger of two neutron stars. These waveforms been constructed by hybridizing numerical-relativity data obtained with the WhiskyTHC code [1] with tidal effective-one-body waveforms [2,3]. More details on the procedure used to generate these waveforms are given in [4]. </p> <p>The waveforms are distributed as HDF5 files containing the amplitude and phase of the -2 spin-weighted spherical harmonics multipoles of the strain:</p> <p><span class="math-tex">\(( h_+ - \mathrm{i} h_\times )_{l,m} = \frac{A_{l,m}}{D_{\rm cm}} \exp(-\mathrm{i} \phi_{l,m} )\)</span></p> <p>where <span class="math-tex">\(D_{\rm cm}\)</span> is the distance in cm from the source.</p> <p>The data files include a machine readable "/metadata" group with:</p> <ul> <li>/metadata/EOS: name of the equation of state</li> <li>/metadata/M_{A|B}: mass in isolation of star A (or B) in grams</li> <li>/metadata/R_{A|B}: radius of star A (or B) in cm</li> <li>/metadata/k2T: tidal coupling constant of the binary (see [3])</li> <li>/metadata/kl_{A|B}: l=2,3,4 dimensionless Love numbers of star A (or B)</li> </ul> <p>We store amplitude and phase for multipoles modes up to l=4 as time series sampled at 16384 Hz.</p> <p>We make these waveforms freely available in the hope that they will be useful. We kindly ask you to cite [3] and [4] in any publication resulting from the use of these waveforms.</p> <p>---<br /> [1] http://www.tapir.caltech.edu/~david_e/whiskythc.html<br /> [2] https://eob.ihes.fr/<br /> [3] S. Bernuzzi, A. Nagar, T. Dietrich, T. Damour; Modeling the Dynamics of Tidally Interacting Binary Neutron Stars up to the Merger; Phys.Rev.Lett. 114 (2015) 16, 161103.<br /> [4] D. Radice, S. Bernuzzi, C. D. Ott; The One-Armed Spiral Instability in Neutron Star Mergers and its Detectability in Gravitational Waves; arXiv:1603.05726.</p>
A Theory of Unpinning of Spiral Waves using Rotating Electric Fields
<p>Spiral waves pinned to obstacles cause self-perpetuating abnormal activation in the heart leading to life-threatening cardiac arrhythmias. To bring the heart back to its normal rhythm, the pinned spirals have to be eliminated. Apart from globally resetting shocks, pulsed and rotating electric fields are known to unpin the spirals using the method of wave emission from heterogeneties, with much lower voltage. Here, we provide a robust mechanism for termination of the pinned spiral waves using a rotating electric field. We show that the termination always happens within the first rotation of the electric field. For a given obstacle size, there exists a threshold time period of rotating field below which the spiral can always be terminated. Our analytical formulation accurately predicts this threshold and explains the absence of traditional unpinning window with the rotating electric field. Since the rotating electric field requires much lower field strength, this study may influence future low-energy defibrillation techniques.</p>
WRF Output for 2 km Simulation of Spiral Gravity Waves
<p>WRF output file for the 2km Spiral Gravity Wave simulation of Nolan and Onderlinde (2022).</p>
WRF Output for 0.5 km Simulation of Spiral Gravity Waves
<p>WRF Output for 0.5 km Simulation of Spiral Gravity Waves</p>
WRF Output for 1 km Simulation of Spiral Gravity Waves with 25 Levels
<p>WRF Output for 1 km Simulation of Spiral Gravity Waves with 25 Levels</p>
WRF Output for 1.5 km Simulation of Spiral Gravity Waves
<p>WRF Output for 1.5 km Simulation of Spiral Gravity Waves</p>
WRF Output for 1 km Simulation of Spiral Gravity Waves
<p>WRF Output for 1 km Simulation of Spiral Gravity Waves, gzipped.</p>
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