Fiol Núñez, BartomeuHaro, ÀlexGarcia i Tormo, Joan2014-11-182014-11-182014-06https://hdl.handle.net/2445/59765Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutors: Bartomeu Fiol Núñez i Alejandro Haro ProvincialeThis thesis deals with the study of the asymptotic series that one obtains for the ground state energy of the anharmonic oscillator, that is, an harmonic oscillator with a quartic perturbation term in its Hamiltonian. First we study a simplified field theory model as an introductory example, and then we use the path integral formulation and semiclassical methods to obtain analytically the behaviour of the series at large order.5 p.application/pdfengcc-by-nc-nd (c) Garcia i Tormo, 2014http://creativecommons.org/licenses/by-nc-nd/3.0/es/Teoria quàntica de campsOscil·ladorsTreballs de fi de grauQuantum field theoryOscillatorsBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess