This thesis work deals with Monte Carlo (MC) simulations with the focus on quantum mechanical systems. I start with an introduction about Monte-Carlo methods in general and their application to the classical Ising model. The second, most important part deals with the problem in quantum mechanics, and presents a possible simulation method, the Stochastic Series Expansion (SSE). I give an introduction about the idea behind that method and give some results obtained for simulations for finite spin chains. All programming was performed in FORTRAN.
Introduction to Heelan's Quantum Mechanics and Objectivity, focused on the quantum mechanics of Heisenberg. The aim of the book is to state and analyze the 'crisis of objectivity' (or crisis of reality) in quantum physics. The method used is an analysis of the intentionality structure of quantum physics as Heisenberg conceived it to be. Through a critique, the present study seeks to arrive at a clarification of both the problem and its presuppositions and ultimately a tentative solution.