Currently, I work mostly in supernova theory and collaborate with K.Nomoto on Superluminous supernovae and other peculiar objects. When I was a PhD student and a postdoc at Ya.B. Zeldovich group in Moscow, we have discovered coronas above accretion disks (together with Gena Bisnovatyi-Kogan). In 1980s I started working on first cosmological applications of Mirror Matter (with Maxim Khlopov) as a model for Dark Matter and on the prediction of a short Gamma Ray Burst (GRB) in merging neutron star binaries (NS+NS) with Igor Novikov, Dmitriy Nadyozhin and others. After the discovery of GW/GRB170817, those predictions have been confirmed for a GRB in NS+NS merger: the GRB Eiso<1e47 erg, its spectral range 10-100 keV, and maximum velocity of ejecta c/3. A few years ago, we were rather pessimistic having the prediction of such a weak GRB and a faint supernova. But all those numbers are actually observed for GRB170817A and what is called now a kilonova! Recently, I am interested in seeking fast analytical formulas for gravitational wave-forms of merging neutron stars and black holes.