# München 2019 – wissenschaftliches Programm

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# GR: Fachverband Gravitation und Relativitätstheorie

## GR 7: Modified Gravity and Applications

### GR 7.6: Vortrag

### Mittwoch, 20. März 2019, 12:15–12:30, HS 5

**Axial quasi-normal modes of massive and massless scalarized neutron stars** — •Zahra Altaha Motahar, Jose Luis Blázquez-Salcedo, Jutta Kunz, and Burkhard Kleihaus — University of Oldenburg, Institute of Physics, Oldenburg, Germany

The emission of gravitational waves as produced by colliding black holes and neutron stars in the observed events follows a typical sequence of phases, consisting of inspiral, merger and ringdown. The ringdown of the final compact object is dominated by its quasi-normal modes. We studied the axial quasi-normal modes of the massless and massive scalarized neutron stars with self interacting. In particular, we employed various realistic equations of state including nuclear, hyperonic and hybrid matter. Although the effect of spontaneous scalarization of neutron stars can be very large, binary pulsar observations and gravitational wave detections significantly constrain the massless scalar-tensor theories. If we consider a nonzero mass for the scalar field, the parameters of the massive case cannot be restricted by the observations, resulting in the large deviations of massive scalarized solutions from pure general relativity. In addition, we extended the universal relations for quasi-normal modes known in general relativity to the wide range of realistic EOS for massive and massless scalarized neutron stars.