• Dense matter; EOS; GWs; Binary mergers.

I studied binary strange star (BSS) mergers, namely the coalescence between two so-called strange stars. Following Witten’s pioneering paper, these exotic stars would be composed of a deconfined phase where up, down and strange quarks strongly interact.
The fully general-relativistic simulations of bare strange stars of equal mass 1.361 were performed with WhiskyTHC code. I considered two separate approaches for the temperature evolution, showing the results in a couple of spatial resolutions.
The first one includes a cold ( T=0) EOS plus a so-called Gamma Law. In this case the post-merger object remains stable without neither a prompt collapse nor a delayed formation of a black hole. A small amount of mass is ejected, whereas the gravitational wave signal is similar to that of binary neutron star mergers.
The second one is a new promising scenario which has not yet been studied in details. Here a fully temperature dependent equation of state is implemented. Unlike before, the remnant does undergo collapse to black hole. Signature of BSS mergers might be found in the GW waveforms, whose amplitude have characteristic “bumps”. A preliminar analysis of ejecta is also reported.
Of course no certainties can be provided, but some indications have also been collected. Hope on one side this may be a starting point for further theoretical investigations; on the other the third incoming generation of interferometers (Einstein Telescope, Advanced LIGO, LISA) will be able to clarify things.