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Massive Theta Lifts
Marcus Berg, Daniel Persson
We use Poincare series for massive Maass-Jacobi forms to define a "massive theta lift", and apply it to the examples of the constant function and the modular invariant j-function,…
String-motivated one-loop amplitudes in gauge theories with half-maximal supersymmetry
Marcus Berg, Igor Buchberger, Oliver Schlotterer
We compute one-loop amplitudes in six-dimensional Yang-Mills theory with half-maximal supersymmetry from first principles: imposing gauge invariance and locality on an ansatz made…
From maximal to minimal supersymmetry in string loop amplitudes
Marcus Berg, Igor Buchberger, Oliver Schlotterer
We calculate one-loop string amplitudes of open and closed strings with N=1,2,4 supersymmetry in four and six dimensions, by compactification on Calabi-Yau and K3 orbifolds. In par…
Towards the One-loop Kahler Metric of Calabi-Yau Orientifolds
Marcus Berg, Michael Haack, Jin U. Kang +1
We evaluate string one-loop contributions to the Kahler metric of closed string moduli in toroidal minimally supersymmetric (Calabi-Yau) orientifolds with D-branes. We focus on the…
Superpotential de-sequestering in string models
Marcus Berg, Joseph P. Conlon, David Marsh +1
Non-perturbative superpotential cross-couplings between visible sector matter and Kähler moduli can lead to significant flavour-changing neutral currents in compactifications of ty…
One-Loop Kahler Metric of D-Branes at Angles
Marcus Berg, Michael Haack, Jin U Kang
We evaluate string one-loop contributions to the Kahler metric of D-brane moduli (positions and Wilson lines), in toroidal orientifolds with branes at angles. Contributions due to…