de
en
Schliessen
Detailsuche
Bibliotheken
Projekt
Impressum
Datenschutz
zum Inhalt
Detailsuche
Schnellsuche:
OK
Ergebnisliste
Titel
Titel
Inhalt
Inhalt
Seite
Seite
Im Dokument suchen
Luthe, Thomas: Fully massive vacuum integrals at 5 loops. 2015
Inhalt
Introduction and motivation
The beta-function of QCD
Pressure in hot QCD
Other applications
Reduction to master integrals
Notation
Momentum shifts
Linear relations between integrals
Integration by parts
Syzygies
Mass derivatives and Lorentz invariance
Relations between different dimensions
Reduction
Example: 4-loop sunset
Solving master integrals
Feynman parameters
Sector decomposition
Parametric integration and linear reducibility
Mellin-Barnes representations
Differential equations
Dimensional recurrence relations
Laporta's method
Example: 2-loop sunset
Difference equations
Laporta's algorithm for difference equations
Minimal order reduction algorithm
Comparison of reduction algorithms
Translation and recurrence relations
Translation process
Optimising input equations
Reducing recurrence relations
Evaluation via factorial series
Interlude: Fibonacci numbers
The general solution
Initial conditions
Precision and convergence
Numerical evaluation in practice
Implementation details
Reductions
Momentum shifts
Generation of equations and the r-s-boundaries
Rational algebra and parallelisation
Numerical runs and delayed subsector execution
Choosing a master basis
Timings
Numerical evaluation
The fully massive tadpoles up to 5 loops
Classification
Results
Checks
Conclusion and outlook
Tadpole classification
Reduction statistics
Numerical results
2-loop
3-loop
4-loop
5-loop
References