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Visar resultat 1 - 5 av 8 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Graphical representations of Ising and Potts models : Stochastic geometry of the quantum Ising model and the space-time Potts model

   Författare :Jakob Erik Björnberg; Anders Björner; Jeffrey Steif; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum Ising model; Ising model; Potts model; random-cluster model; random-current representation; random-parity representation; differential inequality; phase transition; Discrete mathematics; Diskret matematik;

   Sammanfattning : HTML clipboard Statistical physics seeks to explain macroscopic properties of matter in terms of microscopic interactions. Of particular interest is the phenomenon of phase transition: the sudden changes in macroscopic properties as external conditions are varied. LÄS MER

3. 2. Case studies in omniparametric simulation

   Författare :Fredrik Lundin; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; growth model; Ising model; Markov chain; omnithermal simulation; omniparametric simulationpercolatiion; Potts model; parameter estimation; partial observations; random cluster model; Richardson model; simulation driven parameter estimation; two-type Richardson model; omnithermal simulation;

   Sammanfattning : In the eld of particle systems and growths models simulation is an important tool. When explicit calculations are too complex or impossible to perform we may use simulations instead. We adapt a new technique here denoted omniparametric simulation, to the two-type Richardson, Ising and Potts models. LÄS MER

4. 3. Gibbs Measures and Phase Transitions in Potts and Beach Models

   Författare :Per Hallberg; KTH; []
   Nyckelord :Potts model; beach model; percolation; random-cluster model; Gibbs measure; coupling; Markov chains on infinite trees; critical exponent;

   Sammanfattning : The theory of Gibbs measures belongs to the borderlandbetween statistical mechanics and probability theory. In thiscontext, the physical phenomenon of phase transitioncorresponds to the mathematical concept of non-uniqueness for acertain type of probability measures.The most studied model in statistical mechanics is thecelebrated Ising model. LÄS MER

5. 4. Interacting particle systems in varying environment, stochastic domination in statistical mechanics and optimal pairs trading in finance

   Författare :Marcus M J Warfheimer; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Interacting particle systems; contact process; randomly evolving environment; spin systems; Ising model; fuzzy Potts model; pairs trading; optimal stopping; contact process;

   Sammanfattning : In this thesis we first consider the contact process in a randomly evolving environment, introduced by Erik Broman. This process is a generalization of the contact process where the recovery rate can vary between two values. The rate which it chooses is determined by a background process, which evolves independently at different sites. LÄS MER

7. 5. Physics from Wholeness : Dynamical Totality as a Conceptual Foundation for Physical Theories

   Författare :Barbara Piechocinska; Claes-Göran Granqvist; Erik Sjöqvist; Laszlo Kish; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; wholeness; elementary embedding; left-distributivity; braids; special braids; entropy; Temperley-Lieb algebra; von Neumann algebra; Potts model; Fysik; Physics; Fysik; fasta tillståndets fysik; Solid State Physics;

   Sammanfattning : Motivated by reductionism's current inability to encompass the quantum theory we explore an indivisible and dynamical wholeness as an underlying foundation for physics. After reviewing the role of wholeness in the quantum theory we set a philosophical background aiming at introducing an ontology, based on a dynamical wholeness. LÄS MER