Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Yearsley J"'
Autor:
Yearsley, J. M., Halliwell, J. J.
We present an introduction to the backflow effect in quantum mechanics -- the phenomenon in which a state consisting entirely of positive momenta may have negative current and the probability flows in the opposite direction to the momentum. We show t
Externí odkaz:
http://arxiv.org/abs/1301.4893
Autor:
Halliwell, J. J., Yearsley, J. M.
We argue that under very general conditions, there is a significant complication in amplitudes for spacetimes regions constructed from path integrals. This is the fact that the concrete implementation of the restrictions on paths over an interval of
Externí odkaz:
http://arxiv.org/abs/1301.4373
Autor:
Halliwell, J. J., Yearsley, J. M.
Many situations in quantum theory and other areas of physics lead to quasi-probabilities which seem to be physically useful but can be negative. The interpretation of such objects is not at all clear. In this paper, we show that quasi-probabilities n
Externí odkaz:
http://arxiv.org/abs/1210.6870
Autor:
Halliwell, J. J., Yearsley, J. M.
Publikováno v:
Phys. Rev. D 86, 024016 (2012)
Path integrals appear to offer natural and intuitively appealing methods for defining quantum-mechanical amplitudes for questions involving spacetime regions. For example, the amplitude for entering a spatial region during a given time interval is ty
Externí odkaz:
http://arxiv.org/abs/1205.3773
Publikováno v:
Phys. Rev. A 86, 042116 (2012)
We investigate the backflow effect in elementary quantum mechanics - the phenomenon in which a state consisting entirely of positive momenta may have negative current and the probability flows in the opposite direction to the momentum. We compute the
Externí odkaz:
http://arxiv.org/abs/1202.1783
Publikováno v:
Phys. Rev. A 84, 022109 (2011)
A number of approaches to the problem of defining arrival and dwell time probabilities in quantum theory make use of idealised models of clocks. An interesting question is the extent to which the probabilities obtained in this way are related to stan
Externí odkaz:
http://arxiv.org/abs/1106.4767
Autor:
Halliwell, J. J., Yearsley, J. M.
Publikováno v:
J Phys A-Math Theor 43, 445303 (2010)
It is of interest in a variety of contexts, and in particular in the arrival time problem, to consider the quantum state obtained through unitary evolution of an initial state regularly interspersed with periodic projections onto the positive $x$-axi
Externí odkaz:
http://arxiv.org/abs/1006.4788
Autor:
Yearsley, J. M.
Publikováno v:
Phys. Rev. A 82, 012116 (2010)
We extend previous work on the arrival time problem in quantum mechanics, in the framework of decoherent histories, to the case of a particle coupled to an environment. The usual arrival time probabilities are related to the probability current, so w
Externí odkaz:
http://arxiv.org/abs/1003.6079
Autor:
Halliwell, J. J., Yearsley, J. M.
Publikováno v:
Physics Letters A 374(2):154-157 (2009)
In the arrival time problem in quantum mechanics, a standard formula that frequently emerges as the probability for crossing the origin during a given time interval is the current integrated over that time interval. This is semiclassically correct bu
Externí odkaz:
http://arxiv.org/abs/0903.1958
Autor:
Halliwell, J. J., Yearsley, J. M.
Publikováno v:
Physics Review A 79(6): 062101 (2009)
We address a number of aspects of the arrival time problem defined using a complex potential of step function form. We concentrate on the limit of a weak potential, in which the resulting arrival time distribution function is closely related to the q
Externí odkaz:
http://arxiv.org/abs/0903.1957