Agenda
Lundi 23 octobre 2017
On the road to covariant statistical mechanics
Thibaut Josset
Soutenance de thèse de Thibaut Josset.
Geometry transition in covariant loop quantum gravity
Marios Christodoulou
Soutenance de thèse de Marios Christodoulou
Towards new constraints in alternative theories of gravity : cosmography, extended g-evolution, neutron stars and gravitational waves
Alvaro de la Cruz-Dombriz (Gravity & Cosmology Group, University of Cape Town)
Model-independent methods in cosmology, N-body simulations and theoretical predictions in strong-gravity regimes have become essential tool in order to deal with an increasing number of theoretical alternatives for explaining several open issues in the cosmic history. In principle, this provides a way of testing the ΛCDM cosmological paradigm under different assumptions and to rule out whole classes of competing theories. In this talk I will present some of the latest progress and shortcomings in the cosmographic approaches for several modified gravity theories using supernovae catalogues, baryonic acoustic oscillation data and H(z) differential age compilations. I will also sketch a recent line of full N-body simulation technique modifying g-evolution to accommodate effects from higher-order theories and finally, I will provide a flavour on the phenomenology of neutron stars and gravitational waves constraints once the Einsteinian paradigm is abandoned.