TY  - JOUR
AU  - Boudet, S.
AU  - Bombacigno, F.
AU  - Olmo, G. J.
AU  - Porfirio, P.
PY  - 2022
DA  - 2022//
TI  - Quasinormal modes of Schwarzschild black holes in projective invariant Chern-Simons modified gravity
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 032
EP  - 29pp
VL  - 05
IS  - 5
PB  - IOP Publishing Ltd
KW  - Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories
KW  - Exact solutions
KW  - black holes and black hole thermodynamics in GR and beyond
AB  - We generalize the Chern-Simons modified gravity to the metric-affine case and impose projective invariance by supplementing the Pontryagin density with homothetic curvature terms which do not spoil topologicity. The latter is then broken by promoting the coupling of the Chern-Simons term to a (pseudo)-scalar field. The solutions for torsion and nonmetricity are derived perturbatively, showing that they can be iteratively obtained from the background fields. This allows us to describe the dynamics for the metric and the scalar field perturbations in a self-consistent way, and we apply the formalism to the study of quasi normal modes in a Schwarzschild black hole background. Unlike in the metric formulation of this theory, we show that the scalar field is endowed with dynamics even in the absence of its kinetic term in the action. Finally, using numerical methods we compute the quasinormal frequencies and characterize the late-time power law tails for scalar and metric perturbations, comparing the results with the outcomes of the purely metric approach.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2203.04000
UR  - https://doi.org/10.1088/1475-7516/2022/05/032
DO  - 10.1088/1475-7516/2022/05/032
LA  - English
N1  - WOS:000804493000004
ID  - Boudet_etal2022
ER  -