Researcher
Institute for Nuclear Science, UNAM
This is Néstor Ortiz. I am a researcher at the Institute for Nuclear Science (ICN) of the National Autonomous University of Mexico (UNAM). My research focuses on the strong-field regime of classical gravity, either in the context of Einstein’s General Relativity, or alternative theories. I am interested in fundamental aspects of gravity, as well as in applications to high-energy astrophysics.
Using numerical simulations, we predict the gamma-ray emission pattern from a black hole - neutron star binary just a moment before merger. We find that face-on observers receive little emission, equatorial observers see one broad peak, and more generic observers typically see two peaks.
We analyze the spectrum of neutron star pulsations in scalar-tensor gravity, and we compare results with expectations from linear perturbation theory.
For black hole binaries in scalar-Gauss-Bonnet gravity, we compute the leading-order corrections due to curvature nonlinearities in scalar and tensor gravitational waveforms.
We show that, through resonant tidal excitations in a binary inspiral, neutron star crusts generically undergo elastic-to-plastic transition, which leads to crust heating and eventual meltdown.
Inspired in the approach to 'fixing' viscous relativistic hydrodynamics by Israel and Stewart, we introduce a strategy to evade the ill posedness of certain Cauchy problems. We sketch the implementation of this idea in a couple of effective theories of gravity.
We analyze the redshift suffered by photons originating from an external source, traversing a collapsing dust cloud, and finally received by an asymptotic observer. We then study the shadow that the collapsing cloud casts on the sky of the asymptotic observer.
nestor.ortiz[at]nucleares.unam.mx
Office phone: 555 622 4660 Ext. 3313
Instituto de Ciencias Nucleares, UNAM
Circuito Exterior C.U., A.P. 70-543,
04510, Cuidad de México, México.
Office A-2.17