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gr-qc2026
Hamiltonian analysis of disformally coupled fermions in scalar-tensor theories
Alexander Ganz, Apostolos Tsampodimos
We study disformal transformations of scalar fields coupled to a Dirac fermion. The resulting axial coupling generically introduces higher derivatives in the scalar f…
gr-qc2026
Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves
Tikinas Chabour, Guillem Domènech, Alexander Ganz +1
Parity violation in the early Universe may lead to a chiral gravitational wave background. We show that, for finite-time parity-violating sources, the low-frequency tail of the gen…
gr-qc2026
Gravitational wave constraints on the Paneitz operator
Robin Valtin, Alexander Ganz, Guillem Domènech
The Paneitz operator is a dimension-4 conformally invariant fourth-order differential operator that has recently attracted attention for possible cancellations of the vacuum energy…