Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Rivers, R. P. A."'
Publikováno v:
J. Phys.: Condens. Matter 25 404207 (2013)
In this paper we use spontaneous flux production in annular superconductors to shed light on the Kibble-Zurek scenario. In particular, we examine the effects of finite size and external fields, neither of which is directly amenable to the KZ analysis
Externí odkaz:
http://arxiv.org/abs/1302.7296
Publikováno v:
JLTP 171, 788 (2013)
Consistent with the predictions of Kibble and Zurek, scaling behaviour has been seen in the production of fluxoids during temperature quenches of superconducting rings. However, deviations from the canonical behaviour arise because of finite-size eff
Externí odkaz:
http://arxiv.org/abs/1208.3426
Publikováno v:
Advances in Complex Systems, 2012, 15, 1150009
In this article we examine a variety of quantitative models for describing archaeological networks, with particular emphasis on the maritime networks of the Aegean Middle Bronze Age. In particular, we discriminate between those gravitational networks
Externí odkaz:
http://arxiv.org/abs/1102.0251
Publikováno v:
Physical Review B Volume: 80 Issue: 18 Article Number: 180501 NOV 2009
We report on the first experimental verification of the Zurek-Kibble scenario in an isolated superconducting ring over a wide parameter range. The probability of creating a single flux quantum spontaneously during the fast normal-superconducting phas
Externí odkaz:
http://arxiv.org/abs/0907.2505
Autor:
Jones, H. F., Rivers, R. J.
In the context of quasi-Hermitian theories, which are non-Hermitian in the conventional sense, but can be made Hermitian by the introduction of a dynamically-determined metric $\eta$, we address the problem of how the functional integral and the Feyn
Externí odkaz:
http://arxiv.org/abs/0905.3522
Autor:
Rivers, R. J., Steer, D. A.
Publikováno v:
Phys.Rev.D78:023521,2008
We investigate the Hagedorn transitions of string networks with Y-junctions as may occur, for example, with (p,q) cosmic superstrings. In a simplified model with three different types of string, the partition function reduces to three generalised cou
Externí odkaz:
http://arxiv.org/abs/0803.3968
Publikováno v:
Phys. Rev. B 77, 054509, 2008
We report on the spontaneous production of fluxons in the presence of a symmetry-breaking magnetic field for annular Josephson tunnel junctions during a thermal quench. The dependence on field intensity $B$ of the probability $\bar{f_1}$ to trap a si
Externí odkaz:
http://arxiv.org/abs/0707.0569
Publikováno v:
Phys.Lett.B648:64-69,2007
In this further letter on the onset of classical behaviour in field theory due to a phase transition, we show that it can be phrased easily in terms of the decoherence functional, without having to use the master equation. To demonstrate this, we con
Externí odkaz:
http://arxiv.org/abs/hep-ph/0701031
Autor:
Jones, H. F., Rivers, R. J.
Publikováno v:
Phys.Rev.D75:025023,2007
In the Schroedinger formulation of non-Hermitian quantum theories a positive-definite metric operator $\eta\equiv e^{-Q}$ must be introduced in order to ensure their probabilistic interpretation. This operator also gives an equivalent Hermitian theor
Externí odkaz:
http://arxiv.org/abs/hep-th/0612093
Publikováno v:
Phys.Rev.D74:125022,2006
It can be shown using operator techniques that the non-Hermitian $PT$-symmetric quantum mechanical Hamiltonian with a "wrong-sign" quartic potential $-gx^4$ is equivalent to a Hermitian Hamiltonian with a positive quartic potential together with a li
Externí odkaz:
http://arxiv.org/abs/hep-th/0610245