f and r-modes of slowly rotating stars: new results in the linear treatment

May 6, 2013, 5:15 PM
30m
Habana Libre Hotel

Habana Libre Hotel

Talk STARS2013

Speaker

Cecilia Chirenti (Federal University of ABC, Santo André, Brazil)

Description

Newly born neutron stars can present differential rotation, even if later it should be suppressed by viscosity or a sufficiently strong magnetic field. And in this early stage of its life, a neutron star is expected to have a strong emission of gravitational waves, which could be influenced by the differential rotation. We present here a new formalism for modelling differentially rotating neutron stars, working on the slow rotation approximation and assuming a small degree of differential rotation. After we establish our equilibrium model, we explore the influence of the differential rotation on the f and r-modes of oscillation of the neutron star in the Cowling approximation, and we also analyze an effect of the differential rotation on the emission of gravitational radiation from the f-modes. Finally, we introduce magnetic fields in our model to aiming to consider their influence in the frequencies of the oscillations.

Primary author

Cecilia Chirenti (Federal University of ABC, Santo André, Brazil)

Co-authors

Jozef Skakala (Federal University of ABC, Santo André, Brazil) Luciano Rezzolla (Max Planck Institute for Gravitational Physics, AEI Potsdam, Germany) Shin'ichirou Yoshida (University of Tokyo, Japan)

Presentation materials