3 papers
gr-qc2023
The pseudospectra of black holes in AdS
Brad Cownden, Christiana Pantelidou, Miguel Zilhão
We study the stability of quasinormal modes (QNMs) in electrically charged black brane spacetimes that asymptote to AdS by means of the pseudospectrum. Methodologically, we adopt i…
hep-th2019
Examining Instabilities Due to Driven Scalars in AdS
Brad Cownden
We extend the study of the non-linear perturbative theory of weakly turbulent energy cascades in AdS to include solutions of driven systems, i.e. those with time-dependent…
hep-th2018
Variations on the Dirac string
Brad Cownden, Andrew R. Frey
Dirac's original solution of the nontrivial Bianchi identity for magnetic monopoles [Dirac 1948], which redefines the fieldstrength along the Dirac string, diagonalizes the gauge a…