Pulsars, transients and relativistic astrophysics: publications

Probing jet launching in neutron star X-ray binaries: the variable and polarized jet of SAX J1808.4-3658

(2020)

Authors:

MC Baglio, DM Russell, S Crespi, S Covino, A Johar, J Homan, DM Bramich, P Saikia, S Campana, P D'Avanzo, RP Fender, P Goldoni, AJ Goodwin, F Lewis, N Masetti, A Miraval Zanon, SE Motta, T Muñoz-Darias, T Shahbaz

Eccentric Black Hole Mergers in Active Galactic Nuclei

(2020)

Authors:

Hiromichi Tagawa, Bence Kocsis, Zoltan Haiman, Imre Bartos, Kazuyuki Omukai, Johan Samsing

AGN as Potential Factories for Eccentric Black Hole Mergers

(2020)

Authors:

J Samsing, I Bartos, DJ D'Orazio, Z Haiman, B Kocsis, NWC Leigh, B Liu, ME Pessah, H Tagawa

The Young Supernova Experiment: Survey Goals, Overview, and Operations

(2020)

Authors:

DO Jones, RJ Foley, G Narayan, J Hjorth, ME Huber, PD Aleo, KD Alexander, CR Angus, K Auchettl, VF Baldassare, SH Bruun, KC Chambers, D Chatterjee, DL Coppejans, DA Coulter, L DeMarchi, G Dimitriadis, MR Drout, A Engel, KD French, A Gagliano, C Gall, T Hung, L Izzo, WV Jacobson-Galán, CD Kilpatrick, H Korhonen, R Margutti, SI Raimundo, E Ramirez-Ruiz, A Rest, C Rojas-Bravo, MR Siebert, SJ Smartt, KW Smith, G Terreran, Q Wang, R Wojtak, A Agnello, Z Ansari, N Arendse, A Baldeschi, PK Blanchard, D Brethauer, JS Bright, JS Brown, TJL deBoer, SA Dodd, JR Fairlamb, C Grillo, A Hajela, C Hede, AN Kolborg, JAP Law-Smith, C-C Lin, EA Magnier, K Malanchev, D Matthews, B Mockler, D Muthukrishna, Y-C Pan, H Pfister, DK Ramanah, S Rest, A Sarangi, SL Schrøder, C Stauffer, MC Stroh, KL Taggart, S Tinyanont, RJ Wainscoat

Elasticity of tangled magnetic fields

Journal of Plasma Physics Cambridge University Press 86:5 (2020) 905860511

Authors:

DN Hosking, Aa Schekochihin, Steven Balbus

Abstract:

The fundamental difference between incompressible ideal magnetohydrodynamics and the dynamics of a non-conducting fluid is that magnetic fields exert a tension force that opposes their bending; magnetic fields behave like elastic strings threading the fluid. It is natural, therefore, to expect that a magnetic field tangled at small length scales should resist a large-scale shear in an elastic way, much as a ball of tangled elastic strings responds elastically to an impulse. Furthermore, a tangled field should support the propagation of ‘magnetoelastic waves’, the isotropic analogue of Alfvén waves on a straight magnetic field. Here, we study magnetoelasticity in the idealised context of an equilibrium tangled field configuration. In contrast to previous treatments, we explicitly account for intermittency of the Maxwell stress, and show that this intermittency necessarily decreases the frequency of magnetoelastic waves in a stable field configuration. We develop a mean-field formalism to describe magnetoelastic behaviour, retaining leading-order corrections due to the coupling of large- and small-scale motions, and solve the initial-value problem for viscous fluids subjected to a large-scale shear, showing that the development of small-scale motions results in anomalous viscous damping of large-scale waves. Finally, we test these analytic predictions using numerical simulations of standing waves on tangled, linear force-free magnetic-field equilibria.

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