Y. Levin
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View article: Hyperactive Magnetar Eruptions: Giant Flares, Baryon Ejections, and FRBs
Hyperactive Magnetar Eruptions: Giant Flares, Baryon Ejections, and FRBs Open
Young neutron stars born with magnetic fields $B\gtrsim 10^{16}$ G become hyperactive as the field inside the star evolves through ambipolar diffusion on a timescale $\sim 10^9$ s. We simulate this process numerically and find that it can …
View article: Pulsar Rockets and Gaia Neutron Star Binaries
Pulsar Rockets and Gaia Neutron Star Binaries Open
We prove that the spin-aligned electromagnetic recoil force acting on a pulsar vanishes identically in Force-Free Electrodynamics. This contrasts with Hirai et al.'s recent argument that the rocket effect was important for explaining the e…
View article: Giant Hall Waves Launched by Superconducting Phase Transition in Pulsars
Giant Hall Waves Launched by Superconducting Phase Transition in Pulsars Open
The cores of pulsars are expected to become superconducting soon after birth. The transition to type-II superconductivity is associated with the bunching of magnetic field lines into discrete superconducting flux tubes which possess enormo…
View article: Resonant Friction on Disks in Galactic Nuclei
Resonant Friction on Disks in Galactic Nuclei Open
We argue that resonant friction has a dramatic effect on a disk whose rotation direction is misaligned with that of its host nuclear star cluster. The disk’s gravity causes gravitational perturbation of the cluster that in turn exerts a st…
View article: In LIGO’s Sight? Vigorous Coherent Gravitational Waves from Cooled Collapsar Disks
In LIGO’s Sight? Vigorous Coherent Gravitational Waves from Cooled Collapsar Disks Open
We present the first numerical study of gravitational waves (GWs) from collapsar disks, using state-of-the-art 3D general relativistic magnetohydrodynamic simulations of collapsing stars. These simulations incorporate a fixed Kerr metric f…
View article: Giant Hall Waves Launched by Superconducting Phase Transition in Pulsars
Giant Hall Waves Launched by Superconducting Phase Transition in Pulsars Open
The cores of pulsars are expected to become superconducting soon after birth. The transition to type-II superconductivity is associated with the bunching of magnetic field lines into discrete superconducting flux tubes which possess enormo…
View article: Eddington Envelopes: The Fate of Stars on Parabolic Orbits Tidally Disrupted by Supermassive Black Holes
Eddington Envelopes: The Fate of Stars on Parabolic Orbits Tidally Disrupted by Supermassive Black Holes Open
Stars falling too close to massive black holes in the centers of galaxies can be torn apart by the strong tidal forces. Simulating the subsequent feeding of the black hole with disrupted material has proved challenging because of the range…
View article: Gravitational wave driven inspirals of binaries connected by cosmic strings
Gravitational wave driven inspirals of binaries connected by cosmic strings Open
We consider gravitational waves from a pair of monopoles or black holes that\nare moving non-relativistically and are connected by a cosmic string. Shortly\nafter the binary's formation, the connecting string straightens due the direct\nco…
View article: In LIGO's Sight? Vigorous Coherent Gravitational Waves from Cooled Collapsar Disks
In LIGO's Sight? Vigorous Coherent Gravitational Waves from Cooled Collapsar Disks Open
We present the first numerical study of gravitational waves (GWs) from collapsar disks, using state-of-the-art 3D general relativistic magnetohydrodynamic simulations of collapsing stars. These simulations incorporate a fixed Kerr metric f…
View article: Eddington envelopes: The fate of stars on parabolic orbits tidally disrupted by supermassive black holes
Eddington envelopes: The fate of stars on parabolic orbits tidally disrupted by supermassive black holes Open
Stars falling too close to massive black holes in the centres of galaxies can be torn apart by the strong tidal forces. Simulating the subsequent feeding of the black hole with disrupted material has proved challenging because of the range…
View article: THE DISTURBANCE of A MILLISECOND PULSAR MAGNETOSPHERE
THE DISTURBANCE of A MILLISECOND PULSAR MAGNETOSPHERE Open
Pulsar timing has enabled some of the strongest tests of fundamental physics. Central to the technique is the assumption that the detected radio pulses can be used to accurately measure the rotation of the pulsar. Here, we report on a broa…
View article: Superfluid Rivers in Spinning-down Neutron Stars
Superfluid Rivers in Spinning-down Neutron Stars Open
We study the motion of neutron superfluid vortices in a spinning-down neutron star, assuming axisymmetry of the flow and ignoring the motion of vortices about the rotation axis. We find that the vortex array, if initially rectilinear, is s…
View article: Radio Emission and Electric Gaps in Pulsar Magnetospheres
Radio Emission and Electric Gaps in Pulsar Magnetospheres Open
The origin of pulsar radio emission is one of the old puzzles in theoretical astrophysics. In this Letter, we present a global kinetic plasma simulation that shows from first principles how and where radio emission can be produced in pulsa…
View article: Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array
Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array Open
Pulsar timing arrays aim to detect nanohertz-frequency gravitational waves (GWs). A background of GWs modulates pulsar arrival times and manifests as a stochastic process, common to all pulsars, with a signature spatial correlation. Here w…
View article: Superfluid Rivers in Spinning-down Neutron Stars
Superfluid Rivers in Spinning-down Neutron Stars Open
We study the motion of neutron superfluid vortices in a spinning-down neutron star, assuming axisymmetry of the flow and ignoring motion of vortices about the rotation axis. We find that the vortex array, if initially rectilinear, is soon …
View article: Simulating cosmic string loop captured by a rotating black hole
Simulating cosmic string loop captured by a rotating black hole Open
We study the dynamics of a cosmic string loop captured by a rotating black hole, ignoring string reconnections. A loop is numerically evolved in Kerr spacetime, with the result that it turns into one or more growing or contracting double-l…
View article: Vortex Pinning in Neutron Stars, Slipstick Dynamics, and the Origin of Spin Glitches
Vortex Pinning in Neutron Stars, Slipstick Dynamics, and the Origin of Spin Glitches Open
We study pinning and unpinning of superfluid vortices in the inner crust of a neutron star using three-dimensional dynamical simulations. Strong pinning occurs for certain lattice orientations of an idealized, body-centered-cubic lattice a…
View article: Resonant friction on discs in galactic nuclei
Resonant friction on discs in galactic nuclei Open
We argue that resonant friction has a dramatic effect on a disc whose rotation direction is misaligned with that of its host nuclear star cluster. The disc's gravity causes gravitational perturbation of the cluster that in turn exerts a st…
View article: Radio Emission and Electric Gaps in Pulsar Magnetospheres
Radio Emission and Electric Gaps in Pulsar Magnetospheres Open
The origin of pulsar radio emission is one of the old puzzles in theoretical astrophysics. In this Letter we present a global kinetic plasma simulation which shows from first-principles how and where radio emission can be produced in pulsa…
View article: Revisiting Thermal Charge Carrier Refractive Noise in Semiconductor Optics for Gravitational-Wave Interferometers
Revisiting Thermal Charge Carrier Refractive Noise in Semiconductor Optics for Gravitational-Wave Interferometers Open
The test masses in next-generation gravitational-wave interferometers may have a semiconductor substrate, most likely silicon. The stochastic motion of charge carriers within the semiconductor will cause random fluctuations in the material…
View article: Vortex Pinning in Neutron Stars, Slip-stick Dynamics, and the Origin of Spin Glitches
Vortex Pinning in Neutron Stars, Slip-stick Dynamics, and the Origin of Spin Glitches Open
We study pinning and unpinning of superfluid vortices in the inner crust of a neutron star using 3-dimensional dynamical simulations. Strong pinning occurs for certain lattice orientations of an idealized, body-centered cubic lattice, and …
View article: Magnetar Bursts Due to Alfvén Wave Nonlinear Breakout
Magnetar Bursts Due to Alfvén Wave Nonlinear Breakout Open
The most common form of magnetar activity is short X-ray bursts, with durations from milliseconds to seconds, and luminosities ranging from 10 36 –10 43 erg s −1 . Recently, an X-ray burst from the galactic magnetar SGR 1935+2154 was detec…
View article: Erratum: Simulation of a compact object with outflows moving through a gaseous background
Erratum: Simulation of a compact object with outflows moving through a gaseous background Open
A compact object moving relative to surrounding gas accretes material and perturbs the density of gas in its vicinity. In the classical picture of Bondi-Hoyle-Lyttleton accretion, the perturbation takes the form of an overdense wake behind…
View article: Spinning black holes as cosmic string factories
Spinning black holes as cosmic string factories Open
We consider the evolution of a cosmic string loop that is captured by a much more massive and compact black hole. We show that after several reconnections that produce ejections of smaller loops, the loop that remains bound to the black ho…
View article: Alfvén Wave Mode Conversion in Pulsar Magnetospheres
Alfvén Wave Mode Conversion in Pulsar Magnetospheres Open
The radio emission anomaly coincident with the 2016 glitch of the Vela pulsar may be caused by a starquake that launches Alfvén waves into the magnetosphere, disturbing the original radio emitting region. To quantify the lifetime of the Al…
View article: Constraining temperature distribution inside LIGO test masses from frequencies of their vibrational modes
Constraining temperature distribution inside LIGO test masses from frequencies of their vibrational modes Open
Thermal distortion of test masses, as well as thermal drift of their\nvibrational mode frequencies, present a major challenge for operation of the\nAdvanced LIGO and Advanced VIRGO interferometers, reducing optical efficiency,\nwhich limit…
View article: The Thermodynamics of Rotating Black Hole Star Clusters
The Thermodynamics of Rotating Black Hole Star Clusters Open
Rotating star clusters near supermassive black holes are studied using Touma–Tremaine thermodynamics of gravitationally interacting orbital ellipses. A simple numerical procedure for calculating thermodynamic equilibrium states for an arbi…
View article: Evaluation for hypocenter estimation error in the southwestern Kuril trench using Japan and Russia joint seismic data
Evaluation for hypocenter estimation error in the southwestern Kuril trench using Japan and Russia joint seismic data Open
The southwestern Kuril trench is seismically active due to the subduction of the Pacific plate. Great earthquakes in this zone have frequently induced fatal disasters. Seismic monitoring and hypocenter catalogues provide fundamental inform…
View article: Simulation of a compact object with outflows moving through a gaseous background
Simulation of a compact object with outflows moving through a gaseous background Open
A compact object moving relative to surrounding gas accretes material and perturbs the density of gas in its vicinity. In the classical picture of Bondi–Hoyle–Lyttleton accretion, the perturbation takes the form of an overdense wake behind…