15,176 research outputs found
A Unitary Model of The Black Hole Evaporation
A unitary effective field model of the black hole evaporation is proposed to
satisfy almost the four postulates of the black hole complementarity (BHC). In
this model, we enlarge a black hole-scalar field system by adding an extra
radiation detector that couples with the scalar field. After performing a
partial trace over the scalar field space, we obtain an effective entanglement
between the black hole and the detector (or radiation in it). As the whole
system evolves, the S-matrix formula can be constructed formally step by step.
Without local quantum measurements, the paradoxes of the information loss and
AMPS's firewall can be resolved. However, the information can be lost due to
quantum decoherence, as long as some local measurement has been performed on
the detector to acquire the information of the radiation in it. But unlike
Hawking's completely thermal spectrum, some residual correlations can be found
in the radiations. All these considerations can be simplified in a qubit model
that provides a \emph{modified quantum teleportation} to transfer the
information via an EPR pairs.Comment: 42 pages,two figures,published versio
Distributed Collaborative Monitoring in Software Defined Networks
We propose a Distributed and Collaborative Monitoring system, DCM, with the
following properties. First, DCM allow switches to collaboratively achieve flow
monitoring tasks and balance measurement load. Second, DCM is able to perform
per-flow monitoring, by which different groups of flows are monitored using
different actions. Third, DCM is a memory-efficient solution for switch data
plane and guarantees system scalability. DCM uses a novel two-stage Bloom
filters to represent monitoring rules using small memory space. It utilizes the
centralized SDN control to install, update, and reconstruct the two-stage Bloom
filters in the switch data plane. We study how DCM performs two representative
monitoring tasks, namely flow size counting and packet sampling, and evaluate
its performance. Experiments using real data center and ISP traffic data on
real network topologies show that DCM achieves highest measurement accuracy
among existing solutions given the same memory budget of switches
Perturbations of Functional Inequalities for L\'evy Type Dirichlet Forms
Perturbations of super Poincar\'e and weak Poincar\'e inequalities for L\'evy
type Dirichlet forms are studied. When the range of jumps is finite our results
are natural extensions to the corresponding ones derived earlier for diffusion
processes; and we show that the study for the situation with infinite range of
jumps is essentially different. Some examples are presented to illustrate the
optimality of our results
- …