Numerical simulations of compact objects, like (binary) black holes, (binary) neutron stars, their mergers and subsequent formation of a single compact object surrounded by an accretion disk are of paramount importance for contemporary astrophysics (and physics) for several reasons. First, binary neutron-star systems are the best candidate source for explaining a class of gamma-ray bursts, which are in general the most energetic explosions in the Universe. Gamma-ray bursts are observed daily by satellites and telescopes, but their origin is still largely mysterious.
Then, binary neutron-star and/or black-hole systems are powerful sources of gravitational radiation and there are huge experimental efforts worldwide to measure them, especially with laser interferometric detectors. These include the KAGRA detector, which is being built now in Japan. In order to make the detection possible, the accurate knowledge of gravitational waveforms may be of crucial importance.
The measurement of gravitational waves will open a completely new observation window on the Universe, revealing many secrets that are inaccessible to electromagnetic observations (e.g. black-hole dynamics, internal structure of compact stars, internal engine of gamma-ray bursts, big-bang, ...).
In particular, once gravitational waves from binary systems are measured, information about the equation of state of ultra-high-density matter will become available.

Luca Baiotti is currently part of the OUTAP group (Osaka University Theoretical AstroPhysics group) in the Department of Earth and SpaceScience. Prospective students, in particular, are invited to look at the web pages of the OUTAP group.

Constraining the equation of state of neutron stars from binary mergers

Takami K., Rezzolla L., Baiotti L.,

Phys. Rev. Lett. 113 (2014) 091104

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The missing link: Merging neutron stars naturally produce jet-like structrues and can power short gamma-ray bursts

Rezzolla L., Giacomazzo B., Baiotti L., Granot J., Kouveliotou C., Aloy M.A.,

Ap. J. Lett. 732 (2011) L6

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Analytic modelling of tidal effects in the relativistic inspiral of binary neutron stars

Baiotti L., Damour T., Giacomazzo B., Nagar A., Rezzolla L., Phys. Rev.

Lett. 105 (2010) 261101

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Accurate evolutions of inspiralling neutron-star binaries: prompt and delayed collapse to black hole

**Baiotti L.**, Giacomazzo B., Rezzolla L. Phys. Rev. **D78** (2008) 084033

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Accurate simulations of the dynamical bar-mode instability in full General Relativity

**Baiotti L.**, De Pietri R., Manca G.M., Rezzolla L. Phys. Rev. **D75** (2007) 044023

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Challenging the paradigm of singularity excision in gravitational collapse

**Baiotti L.**, Rezzolla L. Phys. Rev. Lett. **97** (2006) 141101

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Three-dimensional relativistic simulations of rotating neutron-star collapse to a Kerr black hole

**Baiotti L.**, Hawke I., Montero P., Lö̈ffler F., Rezzolla L., Stergioulas N., Font J. A., Seidel E. Phys. Rev. **D71** (2005) 024035

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Luca Baiotti received his Ph.D. in astrophysics at SISSA (International School of Advanced Studies), in Trieste (Italy) in 2004. He then worked as a postdoc at the Max-Plank-Institut für Gravitationsphysik, Albert-Einstein-Institut, in Potsdam (Germany) in the period 2004-2007 and as a JSPS fellow at the University of Tokyo (2007-2008) and at Kyoto University (2009).

He is presently Associate Professor in the Graduate School of Science of Osaka University.