Seminario A. Dolgov

Dettagli dell'evento


dalle 12:00 alle 13:00


Stanza 412, Blocco C

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Il giorno 18 ottobre alle ore 11,00 presso l'aula 412, Dolgov Alexander (Dip. Fisica e Sicenze della Terra, Universita di Ferrara) terra un seminario dal titolo

Recent Cosmological Problems and Primordial Black Holes


A review is presented on astronomical observations of the last several years, which have discovered that the universe at the red-shfts, z=5 -10,  is unexpectedly densely populated by bright galaxies, supermassive black holes (quasars), gamma-bursters, supernovae and is very dusty. It is argued that the origin of these early formed objects do not agree with the conventional theory of their formations.
Moreover, similar and probably related phenomena or objects are abundant in the contemporary universe. In particular, the origin of the observed MACHO’s, supermassive black holes (SMBHs) in every large galaxy and even SMBHs in practically
empty space remains mysterious.
All these puzzles are simply and naturally solved in our model of 1993 of massive black hole formationin the early universe. The model predicted log-normal mass distribution of the primordial black holes (PBHs), which became popular in the recent year or two. It explains the puzzling properties of the LIGO-observed gravitational waves and allows for dark matter to be made mostly or solely by PBHs.