Research output per year
Research output per year
I currently work with Johan "Hans" Bijnens and study processes involving mesons, i.e. light but unstable bound states of quarks and antiquarks. They are described by an effective field theory, chiral perturbation theory, which arises from the low-energy limit of the strong sector of the Standard Model. I work with higher orders in this expansion, so that the low-energy approximation gains higher precision and holds for somewhat higher energies. My interests can thus be described tongue-in-cheek as high-energy low-energy high-energy physics.
My master's project and a subsequent doctoral project was about the development of methods for complicated calculations in a simplified version of chiral perturbation theory. This resulted in the publication Higher-order Amplitudes in the Nonlinear Sigma Model with Hans Bijnens and Karol Kampf.
My present project is about constraining the values of the many free parameters in chiral perturbation theory using fundamental properties such as unitarity and crossing symmetry.
I mainly work with exact mathematical calculations rather than numerics. The often extremely large expressions are handled using the FORM language. I also employ Mathematica as well as scripts and numerical programs written in various languages. I like representing mathematical objects graphically.
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Torbjörn Lundberg (Lecturer) & Mattias Sjö (Lecturer)
Activity: Talk or presentation › Public lecture/debate/seminar
Torbjörn Lundberg (Participant), Alice Ohlson (Participant), Peter Christiansen (Speaker), Oliver Matonoha (Speaker), Eleni Skorda (Speaker), Ruth Pöttgen (Speaker), Bernhard Meirose (Speaker), Felix Kahlhoefer (Speaker), Tomas Husek (Speaker), Mattias Sjö (Speaker), Malin Sjödahl (Speaker), Jarkko Peuron (Speaker), Timea Vitos (Speaker), Mathias Hamberg (Speaker) & Kerstin Jon-And (Speaker)
Activity: Participating in or organising an event › Participation in conference
Torbjörn Lundberg (Organiser), Mattias Sjö (Organiser), Leif Lönnblad (Organiser), Chiara Le Roux (Participant), Robin Törnkvist (Participant), Christian Bierlich (Participant), Torbjörn Sjöstrand (Participant), Patrick Kirchgaesser (Participant), Mårten Bertenstam (Participant), Harsh Shah (Participant), Gösta Gustafson (Participant), Roman Pasechnik (Contributor), Leif Gellersen (Participant), Andrew Lifson (Contributor), Korinna Zapp (Participant), Malin Sjödahl (Participant), Rikkert Frederix (Participant), Naomi Cooke (Participant), Smita Chakraborty (Participant), Tomas Husek (Participant), Johan Bijnens (Participant), Jarkko Peuron (Participant) & Timea Vitos (Contributor)
Activity: Participating in or organising an event › Participation in workshop/ seminar/ course
Torbjörn Lundberg (Participant) & Mattias Sjö (Participant)
Activity: Participating in or organising an event › Participation in conference