Settore scientifico disciplinare di riferimento | (FIS/05) |

Ateneo | Università degli Studi di ROMA "La Sapienza" |

Struttura di afferenza | Dipartimento di FISICA |

Recapiti | Elenco recapiti telefonici |

- 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-

Scientific activity

- Author of more than 40 international publications

- Referee for The Astrophysical Journal, Monthly Notices of the Royal Astronomical Society, Kluwer Academic Publishers (Astrophysics and Space Science) and General Relativity and Gravitation (GERG)

- 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 and dark matter

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. Research development on the effects of the presence of dark energy on large scale selfgravitating structures.

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 a model describing the evolution of a globular cluster 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 Boltzmanian theory, by using techniques based on effective potentials applied to distribution function.

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-)

- 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, Palermo 2013

- Workshop “The Unquiet Universe”, Chairman, Cefalù 2014

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. and 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 Polytechica 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 Polytechica CTU Proc., 1, 235 (2014)

- 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)