120,193 research outputs found
Quantum states and space-time causality
Space-time symmetries and internal quantum symmetries can be placed on equal
footing in a hyperspin geometry. Four-dimensional classical space-time emerges
as a result of a decoherence that disentangles the quantum and the space-time
degrees of freedom. A map from the quantum space-time to classical space-time
that preserves the causality relations of space-time events is necessarily a
density matrix.Comment: 9 pages, to appear in the Proceedings of the 2nd International
Symposium on Information Geometry and its Application
Theory of Quantum Space-Time
A generalised equivalence principle is put forward according to which
space-time symmetries and internal quantum symmetries are indistinguishable
before symmetry breaking. Based on this principle, a higher-dimensional
extension of Minkowski space is proposed and its properties examined. In this
scheme the structure of space-time is intrinsically quantum mechanical. It is
shown that the causal geometry of such a quantum space-time possesses a rich
hierarchical structure. The natural extension of the Poincare group to quantum
space-time is investigated. In particular, we prove that the symmetry group of
a quantum space-time is generated in general by a system of irreducible Killing
tensors. When the symmetries of a quantum space-time are spontaneously broken,
then the points of the quantum space-time can be interpreted as space-time
valued operators. The generic point of a quantum space-time in the broken
symmetry phase thus becomes a Minkowski space-time valued operator. Classical
space-time emerges as a map from quantum space-time to Minkowski space. It is
shown that the general such map satisfying appropriate causality-preserving
conditions ensuring linearity and Poincare invariance is necessarily a density
matrix
Hybridity and Habitation: A Rhetorical Analysis of Interior Design in Live-Action Cyberpunk Films Through the Lens of Posthumanism and Thing Theory
Characterized by hyper-urban environments, extreme class division, and an abundance ofcorporate oversight, the cyberpunk subgenre of science-fiction is a prime candidate for scholarly research on speculative interior design and associated technologies. Using the theoretical frameworks of posthumanism, or the concept that humans will transcend their current biological form in the near future, and thing theory, or the worldview that objects are able to enact their autonomy on living subjects, interior design in three live-action films in the cyberpunk subgenre were analyzed in order to determine how depictions of future spaces reflect present ideations of our potential real future. Metaphor analysis was employed as this thesis’ methodology, as the ideologies implemented in design and technology are often understood through tactile or visual interactions with artifacts. After applying metaphor analysis to one domestic space, one workspace, and one decorative element in each film, it has become evident that in our inevitable posthuman future, human scale and the corporeal form of our species must be taken into account when creating spaces and technologies for us to inhabit and use. Though it may be inaccurate to surmise that design can solve all of the institutional problems that plague societies, there is reason to believe that the inanimate spaces and technologies that occupy our lives do play a role in affecting our psyche and ability to foster healthy relationships
Load Forecasting Based Distribution System Network Reconfiguration-A Distributed Data-Driven Approach
In this paper, a short-term load forecasting approach based network
reconfiguration is proposed in a parallel manner. Specifically, a support
vector regression (SVR) based short-term load forecasting approach is designed
to provide an accurate load prediction and benefit the network reconfiguration.
Because of the nonconvexity of the three-phase balanced optimal power flow, a
second-order cone program (SOCP) based approach is used to relax the optimal
power flow problem. Then, the alternating direction method of multipliers
(ADMM) is used to compute the optimal power flow in distributed manner.
Considering the limited number of the switches and the increasing computation
capability, the proposed network reconfiguration is solved in a parallel way.
The numerical results demonstrate the feasible and effectiveness of the
proposed approach.Comment: 5 pages, preprint for Asilomar Conference on Signals, Systems, and
Computers 201
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