Sökning: "feynman"

Visar resultat 1 - 5 av 27 uppsatser innehållade ordet feynman.

1. 1. The cosmological polytope of the complete bipartite graph K_{2,n}

   Master-uppsats, KTH/Matematik (Avd.)

   Författare :Erik Landin; [2023]
   Nyckelord :Polytopes; Cosmological polytopes; Gröbner bases; Graphs; Polytop; Kosmologiska polytop; Gröbner baser; Grafer;

   Sammanfattning : A cosmological polytope of an undirected connected graph is a lattice polytope which when the graph is interpreted as a feynman diagram can be used to calculate the contribution of that feynman diagram to the wavefunction of some cosmological models. This contribution can be calculated using the canonical form of the cosmological polytope, which can be computed by taking the sum of the canonical forms of the facets of a subdivision of the cosmological polytope. LÄS MER

3. 2. Implementing the chirality-flow formalism for tree-level massless QCD in MadGraph

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Adam Warnerbring; [2023]
   Nyckelord :Theoretical physics; The chirality-flow formalism; Physics and Astronomy;

   Sammanfattning : The chirality-flow formalism provides a simple but efficient way to rewrite and evaluate Feynman diagrams and has recently been shown to also optimize automated numerical scattering matrix element evaluations in massless tree-level QED. In this thesis we extend the numerical QED model to massless tree-level QCD in the MadGraph5_aMC@NLO framework. LÄS MER

4. 3. Path Integrals in Quantum Mechanics and Low-Dimensional QFT

   Kandidat-uppsats, Uppsala universitet/Teoretisk fysik

   Författare :Johanna Adbo; [2023]
   Nyckelord :QFT; path integrals; quantum mechanics; kvantfältteori; vägintegraler; kvantmekanik;

   Sammanfattning : The focus of this thesis is to introduce the path integral and some of its applications. One interpretation of quantum mechanics is that a microscopic system which moves from an initial- to a final state moves through each possible intermediate state. LÄS MER

5. 4. On the vector transition form factors in the Ω- → Ξ0 W- decay

   Master-uppsats, Uppsala universitet/Kärnfysik

   Författare :Magnus Bertilsson; [2023]
   Nyckelord :QCD; Form factors; Vector form factors; Chiral perturbation theory; One-loop diagrams; Hadrons; Hadron physics; Hyperon decay; Hadron structure;

   Sammanfattning : To learn more about the structure of hadrons we study form factors. In the semi-leptonic decay Ω- → Ξ0W- two types of form factors arise namely the vector and axial-vector transition form factors. LÄS MER

7. 5. Exploring backward stochastic differential equations and deep learning for high-dimensional partial differential equations and European option pricing

   Kandidat-uppsats, Mälardalens universitet/Akademin för utbildning, kultur och kommunikation

   Författare :Jonathan Leung; [2023]
   Nyckelord :Backward Stochastic Differential Equations; Semilinear Parabolic Partial Differential Equations; Artificial Neural Networks; Nonlinear Option Pricing; Black-Scholes; Nonlinear Feynman-Kac; Euler-Maruyama;

   Sammanfattning : Many phenomena in our world can be described as differential equations in high dimensions. However, they are notoriously challenging to solve numerically due to the exponential growth in computational cost with increasing dimensions. LÄS MER