The inspiral of compact objects like black holes or neutron stars can

be approximated using point masses very well. However, very interesting

astronomical information is contained in effects to gravitational waves

arising from the object's higher multipoles (or their finite size).

Some of these effects can be modeled by an extension of the point mass

action. Based on such an action, contributions of dipole (i.e., spin)

and quadrupole to the post-Newtonian (PN) approximation can be

obtained. The quadrupole effects are the first which encode information

of the internal structure of the compact objects, e.g., they allow an

distinction between black holes and neutron stars and also different

equations of state.

## The PN Approximation Beyond Point-Masses", Jan Steinhoff (CENTRA-IST)'

Nov. 30 - 20:30 - 2011

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