Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Nättilä, Joonas"'
We analyze distributions of the spatial scales of coherent intermittent structures -- current sheets -- obtained from fully kinetic, two-dimensional simulations of relativistic plasma turbulence using unsupervised machine-learning data dissection. We
Externí odkaz:
http://arxiv.org/abs/2408.12511
Autor:
Nättilä, Joonas
Publikováno v:
Nattila, J. Nat Commun 15, 7026 (2024)
Stellar-mass black holes in x-ray binary systems are powered by mass transfer from a companion star. The accreted gas forms an accretion disk around the black hole and emits x-ray radiation in two distinct modes: hard and soft state. The origin of th
Externí odkaz:
http://arxiv.org/abs/2408.08161
Autor:
Changeat, Quentin, Skinner, Jack W., Cho, James Y-K., Nättilä, Joonas, Waldmann, Ingo P., Al-Refaie, Ahmed F., Dyrek, Achrène, Edwards, Billy, Mikal-Evans, Thomas, Joshua, Max, Morello, Giuseppe, Skaf, Nour, Tsiaras, Angelos, Venot, Olivia, Yip, Kai Hou
We present a comprehensive analysis of the Hubble Space Telescope observations of the atmosphere of WASP-121 b, a ultra-hot Jupiter. After reducing the transit, eclipse, and phase-curve observations with a uniform methodology and addressing the biase
Externí odkaz:
http://arxiv.org/abs/2401.01465
Autor:
Loktev, Vladislav, Veledina, Alexandra, Poutanen, Juri, Nättilä, Joonas, Suleimanov, Valery F.
Spectro-polarimetric signatures of accretion disks in X-ray binaries and active galactic nuclei contain information about the masses and spins of their central black holes, as well as the geometry of matter close to the compact objects. This informat
Externí odkaz:
http://arxiv.org/abs/2308.15159
We analyze the structure and dynamics of the plasma atmospheres and Coulomb-liquid oceans on neutron stars. Salient dynamical parameters are identified and their values estimated for the governing set of magnetohydrodynamics equations. Neutron star a
Externí odkaz:
http://arxiv.org/abs/2306.08186
Autor:
Annala, Eemeli, Gorda, Tyler, Hirvonen, Joonas, Komoltsev, Oleg, Kurkela, Aleksi, Nättilä, Joonas, Vuorinen, Aleksi
Publikováno v:
Nat Commun 14, 8451 (2023)
Neutron-star cores contain matter at the highest densities in our Universe. This highly compressed matter may undergo a phase transition where nuclear matter melts into deconfined quark matter, liberating its constituent quarks and gluons. Quark matt
Externí odkaz:
http://arxiv.org/abs/2303.11356
Relativistic collisionless shocks are associated with efficient particle acceleration when propagating into weakly magnetized homogeneous media; as the magnetization increases, particle acceleration becomes suppressed. We demonstrate that this change
Externí odkaz:
http://arxiv.org/abs/2212.06053
Autor:
Nättilä, Joonas, Kajava, Jari J. E.
Neutron stars are rich laboratories of multiple branches of modern physics. These include gravitational physics, nuclear and particle physics, (quantum) electrodynamics, and plasma astrophysics. In this chapter, we present the pioneering theoretical
Externí odkaz:
http://arxiv.org/abs/2211.15721
Autor:
Bogdanov, Slavko, Fonseca, Emmanuel, Kashyap, Rahul, Kurkela, Aleksi, Lattimer, James M., Read, Jocelyn S., Sathyaprakash, Bangalore S., Cromartie, H. Thankful, Dietrich, Tim, Dhani, Arnab, Dolch, Timothy, Gorda, Tyler, Guillot, Sebastien, Ho, Wynn C. G., Huxford, Rachael, Lamb, Frederick K., Landry, Philippe, Meyers, Bradley W., Miller, M. Coleman, Nättilä, Joonas, Paatelainen, Risto, Prescod-Weinstein, Chanda, Säppi, Saga, Stairs, Ingrid H., Stergioulas, Nikolaos, Tews, Ingo, Vuorinen, Aleksi, Wadiasingh, Zorawar, Watts, Anna L.
Our limited understanding of the physical properties of matter at ultra-high density, high proton/neutron number asymmetry, and low temperature is presently one of the major outstanding problems in physics. As matter in this extreme state is known to
Externí odkaz:
http://arxiv.org/abs/2209.07412
Publikováno v:
Applied Mathematics and Computation: 442, pp. 127706, 2023
The paper investigates two new use cases for the Boris Spectral Deferred Corrections (Boris-SDC) time integrator for plasma simulations. First, we show that using Boris-SDC as a particle pusher in an electrostatic particle-in-cell (PIC) code can, at
Externí odkaz:
http://arxiv.org/abs/2110.08024