MARCO MERAFINA

Il corso di Dinamica dei Sistemi Stellari verrà eccezionalmente svolto IN REMOTO.

Inizierà martedì 28 febbraio 2023. Orario delle lezioni: tutti i martedì e i giovedì, ore 16-18.

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Quando sarà ripristinata la modalità IN PRESENZA le lezioni si svolgeranno in Aula Majorana con lo stesso orario.

Contatti

email: marco.merafina@roma1.infn.it

Ufficio: stanza 325 - III piano (Ed. Marconi)

Tel.: +39 06 49914364

Curriculum Vitae
Marco Merafina
- 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) 2006-2013
- Member of Board of Faculty of the International Phd in Astronomy, Astrophysics and Space
Science; PhD supervisor and tutoring 2011-2019
- 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 multi-mass and multi-population
models with particular focus on the equipartition energy problem and evolution of the system.
Development of N-body simulations is also considered.
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, 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
- Workshop “The Hitchhiker’s Advanced Guide to Quantum Collapse Models and their impact in
science, philosophy, technology and biology”, Frascati 2022
- Workshop “Multifrequency Behaviour of High Energy Cosmic Sources - XIV”, invited talk,
Mondello 2023
- THEIA Workshop ECT* “SPICE: Strange hadrons as a Precision tool for strongly InteraCting
systEms”, Trento 2024
- Workshop “Frontier Research in Astrophysics - IV”, invited talk, Mondello 2024
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
1989 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)
1989 Merafina M. and Ruffini R. “Systems of selfgravitating classical particles with a
cutoff in their distribution function” Astronomy and Astrophysics, 221, 4 (1989)
1990 Merafina M. The semidegenerate configurations of a selfgravitating system of
fermions” Nuovo Cimento, 105B, 985 (1990)
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)
1990 Gao J.G., Merafina M. and Ruffini R. “The semidegenerate configurations of a
selfgravitating system of fermions” Astronomy and Astrophysics, 235, 1 (1990)
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)
1991 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)
1992 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)
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)
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)
1993 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)
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)
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)
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)
1993 Bisnovatyi-Kogan G.S., Merafina M., Ruffini R., Vesperini E. “Stability of dense
stellar clusters against relativistic collapse” Astrophysical Journal, 414, 187 (1993)
1995 Merafina M., Ruffini R. “Relativistic collisionless clusters with arbitrarily large
central redshift” Astrophysical Journal Letters, 454, L89 (1995)
1997 Merafina M., Ruffini R. “On a new family of stable relativistic star clusters”
International Journal of Modern Phys. D, 6, 785 (1997)
1998 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)
1999 Merafina M. “Relativistic stellar clusters” Odessa Astronomical Publications, 12,
210 (1999)
2001 Fanelli D., Merafina M., Ruffo S. “A one-dimensional toy model of globular
clusters” Physical Review E, 63, 066614 (2001)
2006 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)
2009 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)
2010 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)
2012 Merafina M., Bisnovatyi-Kogan G.S., Tarasov S.O. “A brief analysis of selfgravitating
polytropic models with a non-zero cosmological constant” Astronomy
and Astrophysics, 541, A84 (2012)
2013 Bisnovatyi-Kogan G.S., Chernin A., Merafina M. “Dark energy and key physical
parameters of clusters of galaxies” Acta Polytechnica, 53, 550 (2013)
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)
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)
2014 Merafina M., Bisnovatyi-Kogan G.S., Donnari M. “Galaxy clusters in presence of
dark energy: a kinetic approach” Astronomy and Astrophysics, 568, A93 (2014)
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)
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)
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)
2015 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)
2016 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)
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)
2017 Merafina M. “Dynamical evolution of globular clusters: Recent developments”
International Journal of Modern Phys. D, 26, 1730017 (2017)
2019 Bisnovatyi-Kogan G.S., Merafina M. “Two-body problem in presence of cosmological
constant” International Journal of Modern Phys. D, 28, 1950155 (2019)
2020 Merafina M., Saturni F.G., Curceanu C., Del Grande R., Piscicchia K. “Selfgravitating
strange dark matter halos around galaxies” Physical Review D, 102,
083015 (2020)
2023 Bisnovatyi-Kogan G.S., Merafina M. “Orbital precession and other properties of
two-body motion in the presence of dark energy” International Journal of Modern
Phys. D, 32, 2350030 (2023)
2024 Teodori M., Straniero O., Merafina M. “Energy equipartition in Globular Clusters
through the eyes of dynamical models” Astronomy and Astrophysics, 691, A202
(2024)
Proceedings
1986 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)
1989 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)
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)
1992 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)
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)
1996 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)
1999 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)
2000 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)
2002 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)
2005 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)
2010 Bisnovatyi-Kogan G.S., Merafina M. “Galaxy clusters in presence of dark energy”
Proceedings of Vulcano Workshop, Vulcano (2010)
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)
2012 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)
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)
2015 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)
2016 Arca-Sedda M., Donnari M., Merafina M. “Formation and evolution of heavy substructures
in the centre of galaxy clusters: the local effect of dark energy”
Proceedings of the 51st Rencontres de Moriond - Cosmology, 137 (2016)
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)
2017 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)
2018 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)
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)
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)
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)
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)
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)
2019 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)
2020 Merafina M. “Massive hadronic candidates to dark matter” Proceeding of the
Conference “XIII Multifrequency Behaviour of High Energy Cosmic Sources
Workshop” Proceedings of Science – POS (MULTIF2019) 011, Mondello (2019)
2023 Merafina M. “The dynamics of Globular Clusters with the GAIA Data” Proceeding
of the Conference “XIV Multifrequency Behaviour of High Energy Cosmic Sources
Workshop” Proceedings of Science – POS (MULTIF2023) 013, Mondello (2023)
2024 Merafina M. “What choice of particle mass values for dark matter candidates?”
Proceeding of the Conference “Frontier Research in Astrophysics - IV” Proceedings
of Science - POS (FRAPWS2024), Mondello (2024)