Search for dissertations about: "Correlation functions"

Showing result 1 - 5 of 262 swedish dissertations containing the words Correlation functions.

  1. 1. Correlation Functions in Integrable Theories From weak to strong coupling

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Raul Pereira; Uppsala universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Superstring theory; AdS CFT correspondence; Integrable field theories; Hexagon form factors; Theoretical Physics; Teoretisk fysik;

    Abstract : The discovery of integrability in planar N=4 super Yang-Mills and ABJM has enabled a precise study of AdS/CFT. In the past decade integrability has been successfully applied to the spectrum of anomalous dimensions, which can now be obtained at any value of the coupling. READ MORE

  2. 2. Static and Dynamic Correlation Effects in Atoms

    University dissertation from Nils Erik Dahlen, Sölvegatan 14A, SE-223 62 Lund, Sweden

    Author : Nils-Erik Dahlen; Lunds universitet.; Lund University.; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetic and optical properties; electrical; Condensed matter:electronic structure; relaxation; magnetic resonance; supraconductors; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; Atom- och molekylärfysik; Atomic and molecular physics; spektroskopi; magnetisk resonans; egenskaper elektriska; supraledare; magnetiska och optiska ; variational energies; double ionization; Electron correlation; laser-atom interaction; Fysicumarkivet A:2002:Dahlen; conserving approximations; Green s functions; GW-approximation;

    Abstract : The thesis considers the effects of electron correlation by studying the two opposite limits of atoms in the ground state and atoms in strong laser pulses. Computational methods and theoretical approaches differ significantly due to the different physical processes that are studied in these two cases. READ MORE

  3. 3. Some results on fast correlation attacks

    University dissertation from Department of Information Technology, Lund Univeristy

    Author : Fredrik Jönsson; Lunds universitet.; Lund University.; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Technological sciences; stream ciphers; linear feedback shift registers; cryptology; correlation attacks; cryptanalysis; Teknik; Informatics; systems theory; Informatik; systemteori;

    Abstract : This thesis presents new results on fast correlation attacks on stream ciphers. In particular, fast correlation attacks on stream ciphers containing linear shift registers with an arbitrary number of taps, are considered. A general introduction to stream ciphers and correlation attacks is given. READ MORE

  4. 4. Time-Dependent Many-Body Perturbation Theory: Possibilities and Limitations

    University dissertation from Department of Information Technology, Lund Univeristy

    Author : Marc Puig von Friesen; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Many-body perturbation theory; Correlation functions; Hubbard model; Non-equilibrium Green s functions; Fysicumarkivet A:2011:Puig von Friesen;

    Abstract : Popular Abstract in Swedish Ett av de mest subtila begrepp i fysik är ``{\bf växelverkan}". I en alldaglig mening betyder växelverkan att skilda entiteter (som elektroner, människor eller galaxer) påverkar\footnote {I fysiken motsvaras denna påverkan av en kraft.} varandra. READ MORE

  5. 5. On Boolean Functions in Symmetric-Key Ciphers

    University dissertation from Department of Information Technology, Lund Univeristy

    Author : Enes Pasalic; Lunds universitet.; Lund University.; [2003]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; autocorrelation properties; correlation attacks; nonlinearity; resiliency; Boolean function; Stream ciphers; block ciphers; Informatics; systems theory; Informatik; systemteori;

    Abstract : This thesis discusses new results on the design and the existence of cryptographically strong Boolean functions used in the design of stream and block ciphers. By interlinking theoretical results and computer search some open problems have been solved, that is, we have shown the existence of previously unknown classes of functions. READ MORE