Seminars

Here is a list of the recent seminars I gave

January 2015 @ ECT*, Trento

upcoming

January 2015 @ European Space Agency, Noordwijk, The Netherlands – ESA 2015

This talk was an overview of my past and current research as well as a brief introduction to my research project.

March, April 2014 @ Tokyo University of Science and Institut d’Astrophysique de Paris  – Paris, Tokyo 2014

In this talk I will describe my recent work on the topic of compact astrophysical objects. In particular these compact objects can be used to probe the theory of gravity at a fundamental level. Neutron stars are among the best observed compact objects, and can display the strongest gravitational field right after black holes. These extreme objects are useful theoretical labs for testing not only the fundamental laws of gravity but also of nuclear matter at high density. The behaviour of nuclear matter in this regime is not well understood, which is manifest from the fact that there exists many candidate equations of state for such matter. In practice, different equations of states result in different macroscopic properties of the star, such as mass, radius, deformability, moments of inertia, … Fortunately, it has been recently discussed in the literature that universal relations exist between some of these quantities, independently of the equation of state. I will very briefly review these relations which were formulated in the slow rotation approximation and introduce new relations in the strong rotation regime. Next, I will introduce a new method of treating perturbations of compact objects, by comparing the gravitational field of the object with that of a point particle surrounded with multi polar degrees of freedom. This is an effective description valid when looking at the compact object from far, where it appears as a point. This procedure allows to disentangle the gravitational radiation field from the matter response to tidal perturbation, and in particular defines a dynamical treatment of relativistic tides.

October 2013 @ D.A.M.T.P. Cambridge : Cambridge_October_2013

I discussed the well-posedness and Hyperbolicity properties of the dynamical Chern-Simons model of Gravity. This model is motivated by String Theory (compactification of type II supergravity down to 4 dimensions), Loop Quantum Gravity or even Particle Physics (related to Chiral anomaly of quantized fermions).

September 2013 @ ULB, Arc Meeting : Brussels_September_2013

In this talk, I discussed the effective field theoretical description of compact objects interactions. Specifically, I illustrated how to extract the multipoles of these objects by a matching procedure between the actual extended configuration and a point particle surrounded by multipolar moments. This is mostly explained in the Newtonian model but the formalism extends to General Relativistic situation.

July 2009 @ Paris, Marcel Grossman Meeting 12 : MG12 – Paris

We present recent results on the phases of AdS higher dimensional black strings. The AdS uniform black string is known to suffer from a Gregory-Laflamme instability, the uniform phase is connected to a non uniform string phase. We present the first steps in the phase diagram by constructing perturbatively the non uniform black string. Moreover, recent results on the solution to the full system of partial differential equations give hints for the existence of a localized black hole phase in higher dimensional AdS.

June 2008 @ Joao do Pessoa – Brasil, Friedman Seminar 2008 : Black Objects