scholarly journals Non-adiabatic dynamics of the entanglement entropy in a symmetry-breaking Haldane insulator

2021 ◽  
Author(s):  
Junjun Xu
Keyword(s):  
Critical Point ◽  
Particle Number ◽  
Entanglement Entropy ◽  
Common Belief ◽  
Number Partition ◽  
Level Model ◽  
The Common ◽  
Adiabatic Dynamics ◽  
Symmetry Protected ◽  
Two Level Model

Abstract We study the non-adiabatic dynamics of a typical symmetry-protected topological phase-the Haldane insulator phase with broken bond-centered inversion. By continuously breaking the middle chain, we find the gap closes at a critical point in the deep Haldane insulator regime with a change of particle number partition of the left or right system. The adiabatic evolution fails at this critical point and we show how to predict the dynamics of the entanglement entropy near this point using a two-level model. These results show that one can find a critical regime where the entanglement measurement is relatively robust against perturbation that breaks the protecting symmetries in the Haldane insulator. This is in contrast to the common belief that the symmetry-protected topological phases are fragile without the protecting symmetries.

scholarly journals Entropies and IPR as Markers for a Phase Transition in a Two-Level Model for Atom–Diatomic Molecule Coexistence

Entropy ◽  
2022 ◽  
Vol 24 (1) ◽  
pp. 113
Author(s):  
Ignacio Baena ◽  
Pedro Pérez-Fernández ◽  
Manuela Rodríguez-Gallardo ◽  
José Miguel Arias
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Large Particle ◽  
State Energy ◽  
Particle Number ◽  
Diatomic Molecules ◽  
The Other ◽  
Abrupt Changes ◽  
Level Model ◽  
Two Level Model

A quantum phase transition (QPT) in a simple model that describes the coexistence of atoms and diatomic molecules is studied. The model, which is briefly discussed, presents a second-order ground state phase transition in the thermodynamic (or large particle number) limit, changing from a molecular condensate in one phase to an equilibrium of diatomic molecules–atoms in coexistence in the other one. The usual markers for this phase transition are the ground state energy and the expected value of the number of atoms (alternatively, the number of molecules) in the ground state. In this work, other markers for the QPT, such as the inverse participation ratio (IPR), and particularly, the Rényi entropy, are analyzed and proposed as QPT markers. Both magnitudes present abrupt changes at the critical point of the QPT.

Aristotle on the Sources of the Ethical Life

2019 ◽  
Author(s):  
Sylvia Berryman
Keyword(s):  
Virtue Ethics ◽  
Human Nature ◽  
Common Belief ◽  
Ethical Life ◽  
Metaphysical Grounding ◽  
Middle Way ◽  
The Common

This work challenges the common belief that Aristotle’s virtue ethics is founded on an appeal to human nature, an appeal that is thought to be intended to provide both substantive ethical advice and justification for the demands of ethics. It is argued that it is not Aristotle’s intent, but the view is resisted that Aristotle was blind to questions of the source or justification of his ethical views. Aristotle’s views are interpreted as a ‘middle way’ between the metaphysical grounding offered by Platonists and the scepticism or subjectivist alternatives articulated by others. The commitments implicit in the nature of action figure prominently in this account: Aristotle reinterprets Socrates’ famous paradox that no one does evil willingly, taking it to mean that a commitment to pursuing the good is implicit in the very nature of action. This approach is compared to constructivism in contemporary ethics.

scholarly journals Understanding Urban Commercial Vehicle Driver Behaviors and Decision Making

2021 ◽  
pp. 036119812110035
Author(s):  
Giacomo Dalla Chiara ◽  
Klaas Fiete Krutein ◽  
Andisheh Ranjbari ◽  
Anne Goodchild
Keyword(s):  
Commercial Vehicle ◽  
Operating Time ◽  
Common Belief ◽  
Policy Makers ◽  
Factors Affecting ◽  
Urban Freight ◽  
The Road ◽  
Commercial Drivers ◽  
The Common ◽  
Printed Materials

As e-commerce and urban deliveries spike, cities grapple with managing urban freight more actively. To manage urban deliveries effectively, city planners and policy makers need to better understand driver behaviors and the challenges they experience in making deliveries. In this study, we collected data on commercial vehicle (CV) driver behaviors by performing ridealongs with various logistics carriers. Ridealongs were performed in Seattle, Washington, covering a range of vehicles (cars, vans, and trucks), goods (parcels, mail, beverages, and printed materials), and customer types (residential, office, large and small retail). Observers collected qualitative observations and quantitative data on trip and dwell times, while also tracking vehicles with global positioning system devices. The results showed that, on average, urban CVs spent 80% of their daily operating time parked. The study also found that, unlike the common belief, drivers (especially those operating heavier vehicles) parked in authorized parking locations, with only less than 5% of stops occurring in the travel lane. Dwell times associated with authorized parking locations were significantly longer than those of other parking locations, and mail and heavy goods deliveries generally had longer dwell times. We also identified three main criteria CV drivers used for choosing a parking location: avoiding unsafe maneuvers, minimizing conflicts with other users of the road, and competition with other commercial drivers. The results provide estimates for trip times, dwell times, and parking choice types, as well as insights into why those decisions are made and the factors affecting driver choices.

scholarly journals Entanglement and Disordered-Enhanced Topological Phase in the Kitaev Chain

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 33 ◽  
Author(s):  
Liron Levy ◽  
Moshe Goldstein
Keyword(s):  
Phase Diagram ◽  
Information Theory ◽  
Quantum Information ◽  
Critical Point ◽  
Entanglement Entropy ◽  
Quantum Information Theory ◽  
Topological Phase ◽  
Many Body ◽  
Zero Modes ◽  
Many Body Systems

In recent years, tools from quantum information theory have become indispensable in characterizing many-body systems. In this work, we employ measures of entanglement to study the interplay between disorder and the topological phase in 1D systems of the Kitaev type, which can host Majorana end modes at their edges. We find that the entanglement entropy may actually increase as a result of disorder, and identify the origin of this behavior in the appearance of an infinite-disorder critical point. We also employ the entanglement spectrum to accurately determine the phase diagram of the system, and find that disorder may enhance the topological phase, and lead to the appearance of Majorana zero modes in systems whose clean version is trivial.

Dead and Gone? Reply to Jenkins

Utilitas ◽  
2013 ◽  
Vol 26 (2) ◽  
pp. 218-220
Author(s):  
KARL EKENDAHL ◽  
JENS JOHANSSON
Keyword(s):  
Recent Article ◽  
Common Belief ◽  
The Common ◽  
Epistemic Role

In a recent article, Joyce L. Jenkins challenges the common belief that desire satisfactionists are committed to the view that a person's welfare can be affected by posthumous events. Jenkins argues that desire satisfactionists can and should say that posthumous events only play an epistemic role: though such events cannot harm me, they can reveal that I have already been harmed by something else. In this response, however, we show that Jenkins's approach collapses into the view she aims to avoid.

scholarly journals Generation-making narratives and responses to diversity in Poland

2021 ◽  
pp. 026858092199852
Author(s):  
Aneta Piekut ◽  
Gill Valentine
Keyword(s):  
Cultural Diversity ◽  
Common Belief ◽  
Ordinary People ◽  
The Common ◽  
Analytical Category ◽  
Study Participants ◽  
Race And Religion ◽  
Depth Interviews

In this article, the authors move away from approaching generations as static categories and explore how ordinary people, as opposed to scholars, distinguish generations and justify their different responses to cultural diversity in terms of ethnicity, race and religion/belief. The analysis draws on 90 in-depth interviews with 30 residents in the Polish capital, Warsaw (2012–2013). Through approaching generation as an analytical category, the authors identify various differentiating narratives which the study participants employed to draw boundaries between generations, reinforcing the common belief that the youngest Poles are most accepting of diversity. Although generations are seen as the axis of difference, conditioning generation-specific responses to diversity, the accounts emerging from the interviews reveal their relational nature, as well as similarities and points of connection between their experiences.

A Creator’s Illness as a Source of Memory and Forgetting: Selected Examples

2020 ◽  
Vol nr specjalny 1(2020) ◽  
pp. 293-310
Author(s):  
Bernadetta Darska ◽  
Keyword(s):  
Critical Point ◽  
Present Article ◽  
Common Denominator ◽  
The Common ◽  
Similarities And Differences ◽  
Universal Nature

In the present article I examine autobiographical works in which writers reveal their illnesses. I am interested not so much in the description of a given ailment, but rather in the embroilment resulting from being ill and from the persistent conflict between memory and forgetting. Becoming aware of the illness turns out to be a critical point, forcing the writers to re-evaluate their own lives. Consequently, memory and forgetting assume a new status. I also attempt to juxtapose the universal nature of being ill and the intimacy of this experience; I point out the similarities and differences involved in dealing with illnesses, the common denominator of which seems to be the necessity of confronting the limits of memory and the expansiveness of forgetting.

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