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gr-qc2026
A principal-symbol obstruction in metric-affine Gauss--Bonnet gravity
Hamed Bouzari Nezhad
The four-dimensional Riemannian Gauss--Bonnet combination admits more than one continuation to a geometry with an independent affine connection. Two natural candidates, the metric-…
gr-qc2026
Removing Ostrogradsky modes in multi-field higher-order scalar-tensor theories
Hamed Bouzari Nezhad
We study how the Ostrogradsky modes can be removed in multi-field higher-order scalar-tensor theories. For a general class of theories with an arbitrary number of sca…