منابع مشابه
Unitarity restoration in the presence of closed timelike curves.
A proposal is made for a mathematically unambiguous treatment of evolution in the presence of closed timelike curves. In constrast to other proposals for handling the naively nonunitary evolution that is often present in such situations, this proposal is causal, linear in the initial density matrix and preserves probability. It provides a physically reasonable interpretation of invertible nonun...
متن کاملUnitarity of quantum theory and closed timelike curves.
Interacting quantum fields on spacetimes containing regions of closed time-like curves (CTCs) are subject to a non-unitary evolution X. Recently, a prescription has been proposed, which restores unitarity of the evolution by modifying the inner product on the final Hilbert space. We give a rigorous description of this proposal and note an operational problem which arises when one considers the ...
متن کاملUnitarity in the Presence of Closed Timelike Curves
We conjecture that, in certain cases, quantum dynamics is consistent in the presence of closed timelike curves. We consider time dependent orbifolds of three dimensional Minkowski space describing, in the limit of large AdS radius, BTZ black holes inside the horizon. Although perturbative unitarity fails, we show that, for discrete values of the gravitational coupling, particle propagation is c...
متن کاملClosed Timelike Curves
In this paper, we explore the possibility that closed timelike curves might be allowed by the laws of physics. A closed timelike curve is perhaps the closest thing to time travel that general relativity allows. We will begin our discussing just what closed timelike curves are, and in what kinds of contexts they were first shown to appear. We then explore how one might actually travel on a close...
متن کاملFailure of unitarity for interacting fields on spacetimes with closed timelike curves.
The scattering of free quantum fields is well defined on a class of asymptotically flat spacetimes with closed timelike curves (CTC's), and, at least on these spacetimes, the S matrix is unitary as well. For interacting fields, however, the preceding paper has obtained a set of unitarity relations that must be satisfied by the Feynman propagator if the scattering is to be unitary to each order ...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2006
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/33/1/042