Marco.Merafina@uniroma1.it's picture
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Il corso di Dinamica dei Sistemi Stellari viene svolto in modalità telematica attraverso collegamento Skype in concomitanza con l'orario previsto delle lezioni (mercoledì e giovedì ore 16-18). Per essere inseriti nel gruppo partecipante alle lezioni, contattare direttamente il docente via mail (marco.merafina@roma1.infn.it)

Office Hours
per appuntamento
Professor CV
- Born in Rome (Italy) on May 29, 1959
- Graduated in Physics at University of Rome "La Sapienza" on January 30, 1986
- Researcher at Physics Department - University of Rome "La Sapienza" since 1992
- Member of the Executive Committee of Physics Department 1995-1999
- Member of Academic Board of University of Rome "La Sapienza" for macroarea 1 (Mathematics, Physics, Chemistry, Geology and Information Science) 2006-2009
- Member of Administration Board of University of Rome "La Sapienza" 2002-2006, 2009-2013
- Member of Board of Faculty of Phd in Astronomia e Astrofisica (Università La Sapienza) 2006-
- Member of Board of Faculty of the International Phd in Astronomy, Astrophysics and Space Science; PhD supervisor and tutoring 2011-
- Member of Direction Board of AURIS (Associazione Università, Ricerca, Innovazione e Società - www.aurisonlus.it) 2007-
- Frascati National Laboratories -INFN- associate 2015-

Scientific activity
- Author of more than 50 international publications
- Referee for the journals: ApJ, MNRAS, A&A, ApSS
- Member of Board of Referees of the journal "Scienze e Ricerche" 2015-

Research Topics
I. Equilibrium and dynamical stability of selfgravitating systems
Study of compact objetcs like relativistic stellar clusters, as possible progenitors of supermassive black holes observed at the inner regions of active galactic nuclei. Study of the equilibrium configurations and analysis of dynamical and thermodynamical stability for models of stellar clusters with anisotropy in velocity distribution of stars.
II. Galactic halos, dark matter and dark energy
Study of semidegenerate particles systems (Fermions) in gravitational equilibrium as a possible description for galactic halos, considerable in cosmological problem of dark matter. Generalization to semidegenerate distributions with cutoff energy in phase space in presence of visible mass. Study of selfgravitating equilibrium configurations in presence of anisotropy in velocity distribution of particles. Models of spheroidal dwarf galaxies with exotic composition of dark matter halos by macro strange matter conglomerates. Research development on the effects of the presence of dark energy on large scale selfgravitating structures and study of the formation of substructures in the center of galaxy clusters.
III. Termodynamic treatment of astrophysical systems
Study of thermodynamical instabilities connected to the evolution of selfgravitating systems strongly influenced by relaxation processes like globular clusters. Development of models describing the evolution of globular clusters to the onset of gravothermal catastrophe, starting from a new statistical approach which defines a different formalism of the various thermodynamical ensembles, out of the framework of the Boltzmanian theory, by using techniques based on effective potentials applied to distribution function. Generalization to multimass models. N-body simulations.

Main International Meetings
- Marcel Grossmann Meeting on General Relativity (Roma 1985, Perth 1988, Kyoto 1991, Stanford 1994, Jerusalem 1997, Rio de Janeiro 2003, Paris 2009, Stockholm 2012, Rome 2015 -chair-, Rome 2018 -chair-)
- International Symposium on Cosmology and Relativistic Astrophysics, Tartu (Estonia) 1988
- Workshop on Dynamics of Globular Clusters, Berkeley (USA) 1992
- XI S.Cruz Summer Workshop on Globular Clusters, S.Cruz (USA) 1992
- Workshop The Universe of Gamow: Original Ideas in Astrophysics and Cosmology , invited talk, Odessa (Ucraina) 1999
- Workshop 4-th Gamow International Conference , invited talk, Odessa (Ucraina) 2009
- Workshop The astrophysics with the ongoing and future experiment: space-based experiments, ground-based experiments , invited talk, Mondello 2013
- Workshop The Unquiet Universe , chair, Cefalù 2014
- Conference Modelling and Observing Dense Stellar System (MODEST 15-S) , Kobe (Japan) 2015
- Conference COSMIC-LAB: Star Clusters as Cosmic Laboratories for Astrophysics, Dynamics and Fundamental Physics (MODEST 16) , Bologna 2016
- Workshop Frontier Research in Astrophysics - II , invited talk, Mondello 2016
- XXII SIGRAV Conference A century of General Relativity , invited talk, Cefalù 2016
- Workshop Stellar aggregates over mass and spatial scales , Bad Honnef (Germany) 2016
- Workshop Multifrequency Behaviour of High Energy Cosmic Sources XII , invited talk, Mondello 2017
- Workshop The Amazing Life of Stars , invited talk, Cefalù 2017
- Workshop Frontier Research in Astrophysics - III , invited talk, Mondello 2018
- Workshop Multifrequency Behaviour of High Energy Cosmic Sources - XIII , invited talk, Mondello 2019
- Workshop ECT* STRANEX: Recent progress and perspectives in STRANge EXotic atoms studies and related topics , Trento 2019

Teaching Activity at Physics Department University of Rome "La Sapienza"
- Laboratory of Physics (CL Chemistry) 1999-2004
- Laboratory of Mechanics 2002-2007 (CL Physics) 2002-2007
- Laboratory of Advanced Calculus (CL Astronomy and Astrophysics) 2007-2009
- Selfgravitating Systems (CL Astronomy and Astrophysics) 2005-
- Dinamics of Stellar Systems (CL Astronomy and Astrophysics) 2005-2006, 2011-

Publications
Merafina M. and Ruffini R. Some remarks on the Zel'dovich-Podurets relativistic solutions for a system of selfgravitating classical particles Europhysics Letters, 9, 621 (1989)
Merafina M. and Ruffini R. Systems of selfgravitating classical particles with a cutoff in their distribution function Astronomy and Astrophysics, 221, 4 (1989)
Merafina M. The semidegenerate configurations of a selfgravitating system of fermions Nuovo Cimento, 105B, 985 (1990)
Ingrosso G., Merafina M. and Ruffini R. Systems of selfgravitating bosons with a cutoff in their distribution function: newtonian treatment , Nuovo Cimento, 105B, 977 (1990)
Gao J.G., Merafina M. and Ruffini R. The semidegenerate configurations of a selfgravitating system of fermions Astronomy and Astrophysics, 235, 1 (1990)
Merafina M. and Ruffini R. The relativistic configurations of systems of particles with a cutoff in their phase space distribution functions Astronomy and Astrophysics, 227, 415 (1990)
Gao J.G., Merafina M. and Ruffini R. The semidegenerate configurations of a selfgravitating system of fermions Acta Astrophysica Sinica (Tianti Wuli Xuebao), 11 (4), 297 (1991)
Boccaletti D., Merafina M., Ruffini R. A re-investigation of the gravothermal catastrophe. The case of a self-gravitating gaseous sphere with a King-like distribution function Journal of the Korean Physical Society (Suppl.), 25, S201 (1992)
Merafina M., Bisnovatyi-Kogan G.S., Ruffini R., Vesperini E. Stability of the dense stellar clusters to relativistic collapse" Journal of the Korean Physical Society (Suppl.), 25, S241 (1992)
Ingrosso G., Merafina M., Ruffini R., Strafella F. System of selfgravitating semidegenerate fermions with a cutoff of energy and angular momentum in their distribution function Astronomy and Astrophysics, 258, 223 (1992)
Bisnovatyi-Kogan G.S., Merafina M., Ruffini R., Vesperini E. Stability of the dense stellar clusters - I Proceedings of XI S.Cruz Summer Workshop on Globular Clusters, 1992 PASP Conference Series, 48, 705 (1993)
Boccaletti D., Merafina M., Ruffini R. Thermodynamic instabilities in King clusters Proceedings of XI S.Cruz Summer Workshop on Globular Clusters, 1992 PASP Conference Series, 48, 709 (1993)
Boccaletti D., Merafina M. Thermodynamics of the King clusters Proceedings of Workshop on Dynamics of Globular Clusters, 1992 PASP Conference Series, 50, 123 (1993)
Bisnovatyi-Kogan G.S., Merafina M., Ruffini R., Vesperini E. Stability of the dense stellar clusters - II" Proceedings of Workshop on Dynamics of Globular Clusters, 1992 PASP Conference Series, 50, 125 (1993)
Bisnovatyi-Kogan G.S., Merafina M., Ruffini R., Vesperini E. Stability of dense stellar clusters against relativistic collapse Astrophysical Journal, 414, 187 (1993)
Merafina M., Ruffini R. Relativistic collisionless clusters with arbitrarily large central redshift Astrophysical Journal Letters, 454, L89 (1995)
Merafina M., Ruffini R. On a new family of stable relativistic star clusters International Journal of Modern Phys. D, 6, 785 (1997)
Bisnovatyi-Kogan G.S., Merafina M., Ruffini R., Vesperini E. Stability of dense stellar clusters against relativistic collapse. II Maxwellian distribution functions with different cutoff parameters Astrophysical Journal, 500, 217 (1998)
Merafina M. Relativistic stellar clusters Odessa Astronomical Publications, 12, 210 (1999)
Fanelli D., Merafina M., Ruffo S. A one-dimensional toy model of globular clusters Physical Review E, 63, 066614 (2001)
Bisnovatyi-Kogan G.S., Merafina M. Selfgravitating gas spheres in a box and relativistic clusters: relation between dynamical and thermodynamical stability Astrophysical Journal, 653, 1445 (2006)
Bisnovatyi-Kogan G.S., Merafina M., Vaccarelli M.R. Spherically symmetric stellar clusters with anisotropy and cutoff energy in momentum distribution: I. The Newtonian regime Astrophysical Journal, 703, 628 (2009)
Bisnovatyi-Kogan G.S., Merafina M., Vaccarelli M.R. Spherically symmetric stellar clusters with anisotropy and cutoff energy in momentum distribution: II. The relativistic regime Astrophysical Journal, 709, 1174 (2010)
Merafina M., Bisnovatyi-Kogan G.S., Tarasov S.O. A brief analysis of self-gravitating polytropic models with a non-zero cosmological constant Astronomy and Astrophysics, 541, A84 (2012)
Bisnovatyi-Kogan G.S., Chernin A., Merafina M. Dark energy and key physical parameters of clusters of galaxies Acta Polytechnica, 53, 550 (2013)
Chernin A.D., Bisnovatyi-Kogan G.S., Teerikorpi P., Valtonen M.J., Byrd G.G., and Merafina M. Dark energy and the structure of the Coma cluster of galaxies Astronomy and Astrophysics, 553, A101 (2013)
Bisnovatyi-Kogan G.S. and Merafina M. Galactic cluster winds in presence of a dark energy Monthly Notices of the Royal Astronomical Society, 434, 3628 (2013)
Merafina M., Bisnovatyi-Kogan G.S., Donnari M. Galaxy clusters in presence of dark energy: a kinetic approach Astronomy and Astrophysics, 568, A93 (2014)
Merafina M., Alberti G. Self-gravitating Newtonian models of fermions with anisotropy and cutoff energy in their distribution function Physical Review D, 89, 123010 (2014)
Merafina M., Vitantoni D. Data analysis of globular cluster Harris Catalogue in view of the King models and their dynamical evolution. I. Theoretical model Acta Polytechnica CTU Proc., 1, 231 (2014)
Merafina M., Vitantoni D. Data analysis of globular cluster Harris Catalogue in view of the King models and their dynamical evolution. II. Observational evidences Acta Polytechnica CTU Proc., 1, 235 (2014)
Merafina M., Alberti G. Self-gravitating relativistic models of fermions with anisotropy and cutoff energy in their distribution function Physical Review D, 92, 023005 (2015)
Merafina M. A new point of view in the analysis of equilibrium and dynamical evolution of globular clusters Mem. S.A.It., 87, 583 (2016)
Donnari M., Arca-Sedda M., Merafina M. Massive black holes interactions during the assembly of heavy sub-structures in the centre of galaxy clusters Mem. S.A.It., 87, 685 (2016)
Merafina M. Dynamical evolution of globular clusters: Recent developments International Journal of Modern Phys. D, 26, 1730017 (2017)
Bisnovatyi-Kogan G.S., Merafina M. Two-body problem in presence of cosmo-logical constant International Journal of Modern Phys. D, 28, 1950155 (2019)

Proceedings
Merafina M. and Ruffini R. On selfgravitating classical systems with a phase space cutoff" Proceedings of the Fourth Marcel Grossmann Meeting on General Relativity, B, 1501 North Holland Physics Publishing, Amsterdam (1986)
Ingrosso G., Merafina M. and Ruffini R. On systems of selfgravitating fermions with a cutoff in their distribution function Proceedings of the Fifth Marcel Grossmann Meeting on General Relativity, B, 1265 D.Blair and M.Buckingham, World Scientific Publishing, Singapore (1989)
Merafina M. and Ruffini R. On systems of selfgravitating classical particles with a cutoff in their distribution function Proceedings of the Fifth Marcel Grossmann Meeting on General Relativity, B, 1255 D.Blair and M.Buckingham, World Scientific Publishing, Singapore (1989)
Boccaletti D., Merafina M., Ruffini R. Gravithermal instability of selfgravitating systems with an energy cut-off in their distribution function Proceedings of the Sixth Marcel Grossmann Meeting on General Relativity, B, 897 H.Sato and T.Nakamura, World Scientific Publishing, Singapore (1992)
Ingrosso G., Merafina M., Ruffini R., Strafella F. Galactic halos and limits on the particle mass Proceedings of the Sixth Marcel Grossmann Meeting on General Relativity, B, 1565 H.Sato and T.Nakamura, World Scientific Publishing, Singapore (1992)
Merafina M., Bisnovatyi-Kogan G.S., Ruffini R., Vesperini E. Stability of the dense stellar clusters to relativistic collapse. Maxwellian distribution functions with different cutoff parameters Proceedings of the Seventh Marcel Grossmann Meeting on General Relativity, A, 447 R.T.Jantzen and G.MacKeiser, World Scientific Publishing, Singapore (1996)
Merafina M. Thermodynamical stability of relativistic stellar systems Proceedings of the Eighth Marcel Grossmann Meeting on General Relativity, A, 345 T.Piran, World Scientific Publishing, Singapore (1999)
Merafina M. Dynamical and thermodynamical instability in relativistic clusters Proceedings of the Second ICRA Network Workshop: The Chaotic Universe Advanced Series in Astrophysics and Cosmology vol. 10, 590 V.G.Gurzadyan and R.Ruffini, World Scientific Publishing, Singapore (2000)
Fanelli D., Merafina M., Ruffo S. A 1-D toy model of globular cluster formation Proceedings of the Ninth Marcel Grossmann Meeting on General Relativity, B, 904 V.G.Gurzadyan, R.T.Jantzen, R.Ruffini, World Scientific Publishing, Singapore (2002)
Merafina M., Bisnovatyi-Kogan G.S. Relation between dynamic and thermodynamic stability of relativistic stellar clusters with cutoff and gas spheres in a spherical box Proceedings of the Tenth Marcel Grossmann Meeting on General Relativity, C, 2411 M.Novello and S.Perez Bergliaffa, World Scientific Publishing, Singapore (2005)
Bisnovatyi-Kogan G.S., Merafina M. Galaxy clusters in presence of dark energy Proceedings of Vulcano Workshop, Vulcano (2010)
Merafina M., Bisnovatyi-Kogan G.S, Vaccarelli M.R. Relativistic stellar clusters: equilibrium models with anisotropic momentum distribution and dynamic and thermodynamic stability of isotropic models AIP Conferences Proceedings, 1206, 399 (2010)
Merafina M., Bisnovatyi-Kogan G.S. Relativistic stellar clusters with anisotropic momentum distribution Proceedings of the Twelfth Marcel Grossmann Meeting on General Relativity, C, 2110 T.Damour and R.T.Jantzen, World Scientific Publishing, Singapore (2012)
Bisnovatyi-Kogan G.S., Chernin A., Merafina M. Galaxy clusters in presence of dark energy Proceeding of the Conference Galaxies: Origin, Dynamics, Structure & Astrophysical Disks , Sochi (2012)
Merafina M., Bisnovatyi-Kogan G.S., Tarasov S.O. Polytropic equilibrium models with non-zero cosmological constant Proceedings of the Thirteenth Marcel Grossmann Meeting on General Relativity, B, 1549 R.T.Jantzen and K.Rosquist, World Scientific Publishing, Singapore (2015)
Arca-Sedda M., Donnari M., Merafina M. Formation and evolution of heavy sub-structures in the centre of galaxy clusters: the local effect of dark energy Proceedings of the 51st Rencontres de Moriond - Cosmology, 137 (2016)
Donnari M., Arca-Sedda M., Merafina M. Can dark energy explain the observed outflow in galaxy clusters? Proceedings of the 51st Rencontres de Moriond - Cosmology, 303 (2016)
Merafina M., Saturni F. Macro dark matter selfgravitating halos around galaxies Proceeding of the Conference Frontier Research in Astrophysics - II Proceedings of Science - POS (FRAPWS2016) 017, Mondello (2016)
Donnari M., Merafina M., Arca-Sedda M. The local effect of Dark Energy in galaxy clusters Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, C, 2210 M.Bianchi and R.T.Jantzen, World Scientific Publishing, Singapore (2018)
Merafina M., Piscicchia K., Donnari M. Gravity and Thermodynamics in globular clusters. Theoretical developments and results by numerical simulations Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, C, 2509 M.Bianchi and R.T.Jantzen, World Scientific Publishing, Singapore (2018)
Piscicchia K., Merafina M. Gravity and Thermodynamics in globular clusters. Gravothermal instability and some observational evidences Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, C, 2515 M.Bianchi and R.T.Jantzen, World Scientific Publishing, Singapore (2018)
Alberti G., Merafina M. Anisotropic fermionic matter in a general relativistic framework and dynamic stability of anisotropic systems Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, C, 2485 M.Bianchi and R.T.Jantzen, World Scientific Publishing, Singapore (2018)
Merafina M. Dynamical evolution of globular clusters: Recent developments Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, A, 693 M.Bianchi and R.T.Jantzen, World Scientific Publishing, Singapore (2018)
Merafina M. Does the core collapse in globular clusters onset before than commonly believed? Proceeding of the Conference XII Multifrequency Behaviour of High Energy Cosmic Sources Workshop Proceedings of Science POS (MULTIF2017) 004, Mondello (2017)
Merafina M. Multimass King models with Kroupa mass function Proceeding of the Conference Frontier Research in Astrophysics - III Proceedings of Science - POS (FRAPWS2018) 010, Mondello (2018)
Course Code Year Course - Attendance
SELF-GRAVITATING SYSTEMS 1012165 2020/2021 Astronomy and Astrophysics
SELF-GRAVITATING SYSTEMS 1012165 2019/2020 Astronomy and Astrophysics
SELF-GRAVITATING SYSTEMS 1012165 2018/2019 Astronomy and Astrophysics
SELF-GRAVITATING SYSTEMS 1012165 2017/2018 Astronomy and Astrophysics
Department
FISICA
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