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Matrix Models of 2D String Theory in Non-trivial Backgrounds
This thesis examines matrix models of 2D string theory in non-trivial backgrounds. It begins with an introduction to string theory partition functions and topological expansions. It then discusses critical strings in background fields and how non-critical strings relate to Liouville gravity. Matrix models are introduced as a way to discretize string worldsheets. The remainder of the thesis explores how matrix quantum mechanics can describe non-critical strings in particular backgrounds like the linear dilaton model.
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2) Introducing spin imbalance splits the spin-wave dispersion and leads to three phases in the mean-field phase diagram: Néel, canted, and Ising phases.
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Recommended
Matrix Models of 2D String Theory in Non-trivial Backgrounds
This thesis examines matrix models of 2D string theory in non-trivial backgrounds. It begins with an introduction to string theory partition functions and topological expansions. It then discusses critical strings in background fields and how non-critical strings relate to Liouville gravity. Matrix models are introduced as a way to discretize string worldsheets. The remainder of the thesis explores how matrix quantum mechanics can describe non-critical strings in particular backgrounds like the linear dilaton model.
Strongly interacting fermions in optical lattices
This document summarizes a PhD thesis talk on strongly interacting fermions in optical lattices. The outline discusses chapters on the Hubbard and Heisenberg models, cooling into the Néel state, and imbalanced antiferromagnets. The introduction provides background on realizing the Hubbard model experimentally and the goal of achieving the Néel state. It also discusses imbalanced Fermi gases and how imbalance may affect the Néel state.
JDK Power Tools
This document provides an overview of tools available in the Java Development Kit (JDK) that allow for powerful introspection and manipulation of the Java Virtual Machine (JVM) and running applications. It discusses the java.lang.instrument API for injecting Java agents, the Java Debugging Interface (JDI) for debugging, the JVM Tool Interface (JVMTI) for heap and frame introspection, and examples of using these tools to build interactive debuggers, inject code at runtime, and test concurrency. Code samples and links to further resources are also provided.
The imbalanced antiferromagnet in an optical lattice
The document summarizes research on the imbalanced antiferromagnet in an optical lattice. Key points:
1) A mean-field analysis of the Fermi-Hubbard model at half filling predicts a Mott insulator phase transition and Néel antiferromagnetic ordering below a critical temperature.
2) Introducing spin imbalance splits the spin-wave dispersion and leads to three phases in the mean-field phase diagram: Néel, canted, and Ising phases.
3) Topological excitations called merons are predicted at low temperatures, whose unbinding drives a Kosterlitz-Thouless transition lowering the critical temperature compared to mean-field theory.
Achieving the Neel state in an optical lattice
Talk given at Physics@FOM Veldhoven 2009. Powerpoint source and high-resolution images available upon request.
Journal reference: Phys. Rev. A 77, 023623 (2008) [arXiv:0711.3425]
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Achieving the Neel state in an optical lattice
Talk given at Physics@FOM Veldhoven 2009. Powerpoint source and high-resolution images available upon request.
Journal reference: Phys. Rev. A 77, 023623 (2008) [arXiv:0711.3425]
[JavaOne 2011] Models for Concurrent Programming
The document discusses models for concurrent programming. It summarizes common misconceptions about threads and concurrency, and outlines some of the core abstractions and tools available in Java for writing concurrent programs, including threads, monitors, volatile variables, java.util.concurrent classes like ConcurrentHashMap, and java.util.concurrent.locks classes like ReentrantLock. It also discusses some models not currently supported in Java like parallel arrays, transactional memory, actors, and Clojure's approach to concurrency using immutable data structures, refs, and atoms.
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This document discusses different NoSQL database technologies for various application requirements. It describes graph databases like Neo4j, document databases like MongoDB, and column family databases like Cassandra. It then provides examples of using each for a blog system, Twitter clone, and social network. Graph databases are well-suited for the social network due to focusing on entity relationships. Document databases work well for the blog by embedding comments in blog posts. A column family database is a good fit for the Twitter clone to handle high write loads through denormalization across column families.
NOSQLEU - Graph Databases and Neo4j
Graph databases are well suited for complex, interconnected data. Neo4j is a graph database that represents data as nodes connected by relationships. It allows for complex queries and traversals of graph structures. Unlike relational databases, graph databases can directly model real world networks and relationships without needing to flatten the data.
Persistent graphs in Python with Neo4j
This document discusses persistent graphs in Python with Neo4j. It begins by explaining the limitations of relational databases and how graph databases like Neo4j focus on modeling complex relationships through nodes and edges. It then provides an overview of Neo4j, describing it as an open source graph database that is stable, actively developed, and can handle billions of nodes and relationships to model complex data.
NOSQL Overview
The document provides an overview of different NoSQL database types, including key-value stores, document databases, column-oriented databases, graph databases, and caches. It discusses examples of databases for each type and common use cases. The document also covers querying graph databases, polyglot persistence using multiple database types, and concludes with when each database type is best suited and when not to use a NoSQL database.
Dominion Power: New Directions in Energy
Dominion Power: New Directions in Energy by Mark Webb, Director-Policy and Business Evaluation, Alternative Energy Solutions
Presented to the Mayor's Energy Task Force-City of Virginia Beach, a series of task force meetings to educate the members on the opportunities and challenges facing us as we search for renewable, sustainable and environmentally sound energy sources.
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Charla master BBK TIC
El documento habla sobre las aplicaciones de la tecnología, las redes y el software en las empresas modernas. Brevemente introduce el tema y divide la presentación en hardware, software y redes/Internet. Explica algunos dispositivos de hardware útiles para las empresas como computadoras de escritorio, portátiles, tabletas y teléfonos inteligentes. También menciona métodos para conectarse a Internet como ADSL y redes inalámbricas.
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Informe especial sobre el narcotráfico y las adicciones en la argentina: 2010...Eduardo Nelson German
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Managing Content, Product and Motivation in Meetings Industry
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Barómetro del narcotráfico y las adicciones en la Argentina
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