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Perturbations of Charged Black Holes with Higher-Order Interactions
Oleksandr S. Stashko, Roman A. Konoplya, Mark P. Hertzberg
We study linear gravitational perturbations and the corresponding quasinormal-mode spectra of electrically and magnetically charged black holes in the presence of higher-order corr…
Constraints on Stable Scalar-Tensor Dark Energy from DESI Data and Solar System Tests
Husam Adam, Mark P. Hertzberg, Daniel Jiménez-Aguilar
We investigate the viability of scalar-tensor (quintessence) models of dark energy with a quartic polynomial nonminimal coupling to gravity and a linear scalar potential. The polyn…
Theoretical and Observational Bounds on Dynamical Chern-Simons Gravity as an Effective Field Theory
Alexander Cassem, Mark P. Hertzberg
Gravitational effective theories are essential for characterizing the space of deviations from General Relativity (GR). Testing these theories against fundamental principles, such…