School of Physics and Astronomy
https://qmro.qmul.ac.uk/handle/123456789/3479
2019-01-16T12:48:22Z
2019-01-16T12:48:22Z
Investigating the possibility of reversing giant planet migration via gap edge illumination
Hallam, PD
Paardekooper, S-J
https://qmro.qmul.ac.uk/handle/123456789/54686
2019-01-16T11:30:28Z
2018-12-01T00:00:00Z
Investigating the possibility of reversing giant planet migration via gap edge illumination
Hallam, PD; Paardekooper, S-J
2018-12-01T00:00:00Z
First astrometric reduction of Cassini Imaging Science Subsystem images using an automatic procedure: application to Enceladus images 2013-2017
Zhang, QF
Lainey, V
Cooper, NJ
Vienne, A
Peng, QY
Xiong, YT
https://qmro.qmul.ac.uk/handle/123456789/54657
2019-01-16T10:29:56Z
2018-11-01T00:00:00Z
First astrometric reduction of Cassini Imaging Science Subsystem images using an automatic procedure: application to Enceladus images 2013-2017
Zhang, QF; Lainey, V; Cooper, NJ; Vienne, A; Peng, QY; Xiong, YT
2018-11-01T00:00:00Z
Biadjoint wires
Bahjat-Abbas, N
Stark-Muchão, R
White, CD
https://qmro.qmul.ac.uk/handle/123456789/54639
2019-01-16T10:30:25Z
2018-11-20T00:00:00Z
Biadjoint wires
Bahjat-Abbas, N; Stark-Muchão, R; White, CD
© 2018 The Author(s) Biadjoint scalar field theory has been the subject of much recent study, due to a number of applications in field and string theory. The catalogue of exact non-linear solutions of this theory is relatively unexplored, despite having a role to play in extending known relationships between gauge and gravity theories, such as the double copy. In this paper, we present new solutions of biadjoint scalar theory, corresponding to singular line configurations in four spacetime dimensions, with a power-law dependence on the cylindrical radius. For a certain choice of common gauge group (SU(2)), a family of infinitely degenerate solutions is found, whose existence can be traced to the global symmetry of the theory. We also present extended solutions, in which the pure power-law divergence is partially screened by a form factor.
2018-11-20T00:00:00Z
The Magnetic Part of the Weyl Tensor, and the Expansion of Discrete Universes
Clifton, T
Gregoris, D
Rosquist, K
https://qmro.qmul.ac.uk/handle/123456789/54508
2019-01-11T10:30:39Z
2017-01-27T00:00:00Z
The Magnetic Part of the Weyl Tensor, and the Expansion of Discrete Universes
Clifton, T; Gregoris, D; Rosquist, K
We examine the effect that the magnetic part of the Weyl tensor has on the large-scale expansion of space. This is done within the context of a class of cosmological models that contain regularly arranged discrete masses, rather than a continuous perfect fluid. The natural set of geodesic curves that one should use to consider the cosmological expansion of these models requires the existence of a non-zero magnetic part of the Weyl tensor. We include this object in the evolution equations of these models by performing a Taylor series expansion about a hypersurface where it initially vanishes. At the same cosmological time, measured as a fraction of the age of the universe, we find that the influence of the magnetic part of the Weyl tensor increases as the number of masses in the universe is increased. We also find that the influence of the magnetic part of the Weyl tensor increases with time, relative to the leading-order electric part, so that its contribution to the scale of the universe can reach values of ∼ 1%, before the Taylor series approximation starts to break down.
2017-01-27T00:00:00Z