Abstract
The absorption cross section is studied in the low-frequency region for a propagating scalar field under the warped AdS3 black hole background in the { cosmological} topologically massive gravity. It can be shown that the absorption cross section is { unexpectedly} deformed by the gravitational Chern-Simons term, which is proportional to the scattering area of black hole with an additional contribution depending on the combinations of left-moving and right-moving temperatures. It means that the cross section is larger than the area in spite of the s-wave limit. Finally, we discuss the left-right quasinormal modes for the scalar perturbation in this black hole.
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