scholarly journals Remarks on some new models of interacting quantum fields with indefinite metric

1997 ◽  
Vol 40 (3) ◽  
pp. 385-394 ◽  
Author(s):  
S. Albeverio ◽  
H. Gottschalk ◽  
J.-L. Wu
2001 ◽  
Vol 216 (3) ◽  
pp. 491-513 ◽  
Author(s):  
Sergio Albeverio ◽  
Hanno Gottschalk

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Chris Akers ◽  
Netta Engelhardt ◽  
Geoff Penington ◽  
Mykhaylo Usatyuk

Abstract We formulate a quantum generalization of maximin surfaces and show that a quantum maximin surface is identical to the minimal quantum extremal surface, introduced in the EW prescription. We discuss various subtleties and complications associated to a maximinimization of the bulk von Neumann entropy due to corners and unboundedness and present arguments that nonetheless a maximinimization of the UV-finite generalized entropy should be well-defined. We give the first general proof that the EW prescription satisfies entanglement wedge nesting and the strong subadditivity inequality. In addition, we apply the quantum maximin technology to prove that recently proposed generalizations of the EW prescription to nonholographic subsystems (including the so-called “quantum extremal islands”) also satisfy entanglement wedge nesting and strong subadditivity. Our results hold in the regime where backreaction of bulk quantum fields can be treated perturbatively in GNħ, but we emphasize that they are valid even when gradients of the bulk entropy are of the same order as variations in the area, a regime recently investigated in new models of black hole evaporation in AdS/CFT.


1975 ◽  
Vol 20 (5) ◽  
pp. 431-432
Author(s):  
ANTHONY G. GREENWALD

1969 ◽  
Vol 14 (8) ◽  
pp. 421-423 ◽  
Author(s):  
W. ROBERT DIXON

2016 ◽  
pp. 5-33 ◽  
Author(s):  
V. Mau

The paper deals with 2015 trends and challenges for social and economic policy in the nearest future. The analysis of global crisis includes: uneven developments in the leading advanced and emerging economies; new models of economic growth which look differently in different countries; prospects of globalization and challenges of ‘regional globalization’; currency configurations of the future; energy prices dynamics and its influence on political and economic prospects of particular states. Current challenges are discussed in the context of previous 30 years. Among the main topics on Russia, there are approaches to a new growth model, structural transformation (including import substitution issues), economic dynamics, budget and monetary outlines, social issues. The priorities of economic policy are also considered.


2020 ◽  
pp. 84-107
Author(s):  
Vera Borges ◽  
Luísa Veloso

In the wake of the 2008 global financial and economic crisis, new forms of work organization emerged in Europe. Following this trend, Portugal has undergone a reconfiguration of its artistic organizations. In the performing arts, some organiza-tions seem to have crystalized and others are reinventing their artistic mission. They follow a plurality of organizational patterns and resilient profiles framed by cyclical, structural and occupational changes. Artistic organizations have had to adopt new models of work and seek new opportunities to try out alternatives in order to deal, namely, with the constraints of the labour market. The article anal-yses some of the restructuring processes taking place in three Portuguese artistic organizations, focusing on their contexts, individual trajectories and collective missions for adapting to contemporary challenges of work in the arts. We conclude that organizations are a key domain for understanding the changes taking place.


2016 ◽  
Author(s):  
Mari I. Suominen ◽  
Urs B. Hagemann ◽  
Yvonne Konkol ◽  
Jenni Bernoulli ◽  
Katja M. Fagerlund ◽  
...  

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