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78 papers · 1 filter
Scaling of cosmological domain wall networks with junctions
P. P. Avelino, C. J. A. P. Martins, J. Menezes +2
We describe the results of the largest and most accurate three-dimensional field theory simulations of domain wall networks with junctions. We consider a previously introduced clas…
Accretion Discs with Strong Toroidal Magnetic Fields
M. C. Begelman, J. E. Pringle
Simulations and analytic arguments suggest that the turbulence driven by magnetorotational instability (MRI) in accretion discs can amplify the toroidal (azimuthal) component of th…
Lyman-alpha Absorption from Heliosheath Neutrals
Brian E. Wood, Vladislav V. Izmodenov, Jeffrey L. Linsky +1
We assess what information HST observations of stellar Ly-alpha lines can provide on the heliosheath, the region of the heliosphere between the termination shock and heliopause. To…
X-ray flares and the duration of engine activity in gamma-ray bursts
Davide Lazzati, Rosalba Perna
The detection of bright X-ray flares superimposed on the regular afterglow decay in Swift gamma-ray bursts has triggered theoretical speculations on their origin. We study the temp…
Dust dynamics during protoplanetary disc clearing
R. D. Alexander, P. J. Armitage
We consider the dynamics of dust and gas during the clearing of protoplanetary discs. We work within the context of a photoevaporation/viscous model for the evolution of the gas di…
The Chemical Distribution in a Subluminous Type Ia Supernova: HST Images of the SN 1885 Remnant
Robert A. Fesen, Peter A. Hoeflich, Andrew J. S. Hamilton +4
We present HST images of the remnant of SN 1885 seen in absorption against M31's bulge via resonance lines of Ca I, Ca II, Fe I, and Fe II. Viewed in CaII H & K line absorption, th…