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Relaxation of weakly collisional plasma: Continuous spectra, discrete eigenmodes, and the decay of echoes.
Phys Rev E
October 2024
Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA.
The relaxation of a weakly collisional plasma, which is of fundamental interest to laboratory astrophysical plasmas, can be described by the self-consistent Boltzmann-Poisson equations with the Lenard-Bernstein collision operator. We perform a perturbative (linear and second-order) analysis of the Boltzmann-Poisson equations and obtain exact analytic solutions which resolve some longstanding controversies regarding the impact of weak collisions on the continuous spectra, the discrete Landau eigenmodes, and the decay of plasma echoes. We retain both damping and diffusion terms in the collision operator throughout our treatment.
View Article and Find Full Text PDFModel-free prediction of multistability using echo state network.
Chaos
October 2022
Department of Physics, Central University of Rajasthan, Ajmer 305817, Rajasthan, India.
In the field of complex dynamics, multistable attractors have been gaining significant attention due to their unpredictability in occurrence and extreme sensitivity to initial conditions. Co-existing attractors are abundant in diverse systems ranging from climate to finance and ecological to social systems. In this article, we investigate a data-driven approach to infer different dynamics of a multistable system using an echo state network.
View Article and Find Full Text PDFCandidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino.
Phys Rev Lett
June 2022
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street 76100 Rehovot, Israel.
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincident with another high-energy neutrino.
View Article and Find Full Text PDFLight bending and X-ray echoes from behind a supermassive black hole.
Nature
July 2021
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA, USA.
The innermost regions of accretion disks around black holes are strongly irradiated by X-rays that are emitted from a highly variable, compact corona, in the immediate vicinity of the black hole. The X-rays that are seen reflected from the disk, and the time delays, as variations in the X-ray emission echo or 'reverberate' off the disk, provide a view of the environment just outside the event horizon. I Zwicky 1 (I Zw 1) is a nearby narrow-line Seyfert 1 galaxy.
View Article and Find Full Text PDFRelaxation of the Collective Magnetization of a Dense 3D Array of Interacting Dipolar S=3 Atoms.
Phys Rev Lett
October 2020
Laboratoire de Physique des Lasers, Université Paris 13, F-93430 Villetaneuse, France.
We report on measurements of the dynamics of the total magnetization and spin populations in an almost unit-filled lattice system comprising about 10^{4} spin S=3 chromium atoms, under the effect of dipolar interactions. The observed spin population dynamics is unaffected by the use of a spin echo and fully consistent with numerical simulations of the S=3 XXZ spin model. On the contrary, the observed magnetization decays slower than in simulations and, surprisingly, reaches a small but nonzero asymptotic value within the longest timescale.
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