KEYNOTES

Numerical Simulations with Scalar Field Dark Matter.


Tonatiuh Matos
Department of Physics-Cinvestav, Mexico


Abstract: The Scalar Field Dark Matter (SFDM) model (also called Wave Dark Matter, Ultra-Light Axion dark matter or Bose-Einstein Condensate dark matter) has shown to be an excellent candidate to be the dark matter of the universe. This model is in excellent agreement with cosmological observations like the mass power spectrum, the CMB observations, etc. The model predicts core central density profiles in galaxias and a natural cut of in the structure formation. Using the SFDM model we recover spiral and barred spiral patterns in disk galaxy simulations. We show how the interaction between a baryonic disk and its Dark Matter Halo triggers the formation of spiral structures when the halo is allowed to have a triaxial shape and angular momentum. This is a more realistic picture within the SFDM model since a nonspherical rotating halo seems to be more natural. By performing hydrodynamic simulations, along with earlier test particles simulations, we demonstrate another important way in which SFDM is consistent with observations. The common existence of bars in these simulations is particularly noteworthy.

About the speaker: Tonatiuh Matos is a researcher whose recent work focuses on finding the nature of matter and dark energy. He is a National Research System Level III member since 2003. He obtained his Physics and Mathematics BSc and MSc in Physics degrees from the Higher Education School of Physics and Mathematics in the National Polytechnic Institute. He received his PhD in Theoretical Physics in 1987 from the Friedrich-Schiller at Jena University in Germany, where he also obtained his habilitation in astrophysics in 1998. Hi had postdoctoral periods at University of Vienna and the Technical University of Vienna. He did research stays at the Albert Institute Einstein of the Max-Planck Foundation of Germany and in German and American Universities. He also has been visiting professor at the University of British Columbia in Vancouver, Canada.

Profr. Matos was founder Vice President of the Gravitation and Mathematical Physics Division of the Mexican Physical Society (SMF) in 1992 and by 1995 he was president. In 1998, he founded the Astrophysics Mexican School (EMA) and has been co-organizer of it ever since. He was founder general secretary of the Cosmology Advanced Institute (IAC) during 2007-2015.

Among the societies and academies to whom he is member we can cite: the Mexican Academy of Sciences since 1992, the Mexican Physical Society since 1982, Sigma Xi-the Scientific Research Society since 2004, and the New York Academy of Science since 2007.

He has published over 110 papers in indexed-journals, which have more than 1,300 quotations. He is author of the book “What is the universe made of?” in the “Science for all” series from “Economic Culture Fund”. He has edited 7 books and he has participated in the edition of 25 books. Tonatiuh has advised 16 PhD students. One of these won the Arturo Rosenblueth award from the Cinvestav, while other obtained the Weizmann Award from the Mexican Academy of Sciences. 3 of his former doctoral students are now level III members of SNI. He has been invited to more than 30 international conferences as a speaker. In 2001, along with Miguel Alcubierre and Darío Nunez from ICN, founded the “Supercomputing Laboratory AstrofíSICO” (LaSumA) in Cinvestav.

Over time, Profr. Matos has worked primarily in two areas: mathematical physics and theoretical physics. In mathematical physics he has worked on two topics: Backlund transformations and Sigma Designs, where he has developed a technique for solving the chiral equations called subspaces and Subgroups in Mappings Harmonics. Also, he has worked in the study of wormholes (WH) in the universe where he discovered the first WH rotation and a new type of Cosmic Censorship. In theoretical physics he has worked primarily in the following areas: multidimensional theories, where he developed a technique to study Einstein axisymmetric stationary 5 dimensional equations "on demand". Scalar Dark Matter, where he was the first to propose the scalar dark matter hypothesis, which has survived 15 years of astrophysical high-resolution observations. Astrophysics and dark matter, where he discovered in 2001 along with Dario Nunez that one of the components of a galaxy metric is determined by observing their rotation curves. In Cosmology, dark energy, along with his student Luis Ureña-López proposed a very smart candidate for dark energy of the universe, the so-called model Urena-Matos, a model Quintessence with sinh potential. In Brane theory, he developed a topological model that explains the Big Bang and the accelerating universe. In recent years he has devoted himself to the study of Bose-Einstein condensates. He has managed to explain the phase transition of a gas of bosons its condensed state in a simple manner using quantum field theory, so far only understood empirically.
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