Gravitational waves from pulsars and their braking indices in the context of magnetic ellipticity

Data: 
20/09/2017 - 14:00 - 15:00
Local: 
IAG, Aud. Principal - Bloco G

Gravitational waves from pulsars and their braking indices in the context of magnetic ellipticity

 

José Carlos N. de Araújo

INPE

 

We study the role of time dependent magnetic ellipticities on the calculation of the braking index of pulsars. Moreover, we study the consequences of such a magnetic ellipticity on the amplitude of gravitational waves (GWs) generated by pulsars with measured braking indices. We show that, since the ellipticity generated by the magnetic dipole is extremely small, the corresponding amplitude of GWs is much smaller than the amplitude obtained via the spindown limit. Since only nine of more than 2000 known pulsars have accurately measured braking indices, we extended this study to all known pulsars, in particular to what concerns the GW generation. Our results show that the GW amplitude is at best h ~ 10^{-28}. This leads to a pessimistic prospect for the detection of GWs generated by these pulsars, even for Advanced LIGO and Advanced Virgo, and the planned Einstein Telescope, if the ellipticity has magnetic origin.