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7 papers · 1 filter
Expanding Spherically Symmetric Models without Shear
Sunil D Maharaj, Peter GL Leach, Roy Maartens
The integrability properties of the field equation of a spherically symmetric shear--free fluid are investigated. A first integral, subject to an integrability c…
Quadrupole anisotropy from photon quantum effects
Alexei V Nesteruk, Roy Maartens
We consider quantum effects of an electromagnetic field in a radiation-dominated almost FRW spacetime. The dominant non-local quantum correction to the photon distribution is a qua…
Almost-homogeneity of the universe in higher-order gravity
David R Taylor, Roy Maartens
In the gravity theory, we show that if freely propagating massless particles have an almost isotropic distribution, then the spacetime is almost Friedmann-Robertson-Walker…
Kinematics and Dynamics of Theories of Gravity
Steve Rippl, Henk van Elst, Reza Tavakol +1
We generalise the equations governing relativistic fluid dynamics given by Ehlers and Ellis for general relativity, and by Maartens and Taylor for quadratic theories, to generalise…
Nuclear Shell Structure and Chaotic Dynamics in Hexadecapole Deformation
W. Dieter Heiss, Rashid G. Nazmitdinov, Stefanel Radu
The effect of an axially symmetric hexadecapole term is investigated in a strongly deformed quadrupole potential. While the system is nonintegrable and shows significant chaotic be…
Quantum Chaos, Degeneracies and Exceptional Points
W. Dieter Heiss, Stefanel Radu
It is argued that, if a regular Hamiltonian is perturbed by a term that produces chaos, the onset of chaos is shifted towards larger values of the perturbation parameter if the unp…