3 papers
math.DG2025
Contractibility of spaces of positive scalar curvature metrics with symmetry
Christian Baer, Bernhard Hanke
We show the contractibility of spaces of invariant Riemannian metrics of positive scalar curvature on compact connected manifolds of dimension at least two, with and without bounda…
math.DG2022
The Cauchy problem for Lorentzian Dirac operators under non-local boundary conditions
Christian Baer, Penelope Gehring
Non-local boundary conditions, such as the Atiyah-Patodi-Singer (APS) conditions, for Dirac operators on Riemannian manifolds are well understood while not much is known for such o…
math.DG2022
Remarks on the paper "On Gromov's dihedral extremality and rigidity conjectures" by Jinmin Wang, Zhizhang Xie and Guoliang Yu
Christian Baer, Bernhard Hanke, Thomas Schick
Version 2 of the article "On Gromov's dihedral extremality and rigidity conjectures" by Jinmin Wang, Zhizhang Xie and Guoliang Yu makes a number of claims for self-adjoint extensio…