### Research Interest

General Relativity, quantum gravity, black holes, naked singularities, cosmology.

More in detail:

General relativity, cosmology, black holes, singularities, semiclassical approaches to quantum gravity

My interests in General Relativity cover exact solutions of Einstein’s field equations and analytical models for astrophysics and cosmology, Hamiltonian formulation of gravity and possible approaches to quantum gravity.

– Gravitational collapse: In the framework of spherical collapse I have been working on the role played by pressures in the formation of black holes or naked singularities as the end-state of the complete collapse of a gravitating object.

– Quantum-gravity: I have been working on the effects of small scale modifications to the classical relativistic framework for collapse. Quantum-gravity induced effects are thought to be important in the strong field regime towards the end of collapse and they might help resolve the formation of classical singularities.

– Compact objects: I have been working on theoretical dynamical scenarios that lead to the formation of compact objects (not necessarily black holes). These compact sources can be used to model the remnants of supernovae explosions as well as the supermassive object that exist at the center of galaxies.

– Observational features of naked singularities and exotic compact objects: I haveve been working on the possible observational signatures of exotic compact sources as described by spacetimes with naked singularities. I studied the properties of accretion disks around a variety of spherically symmetric and axially symmetric spacetimes and compared with the properties of disks around a Schwarzschild black hole.

– Axially symmetric space-times: I studied topological and physical properties of axially symmetric metrics and I have been working on the construction of physically viable sources for a specific class of static metrics.

– Thin matter shells: I studied the dynamics of thin shells with general equation of state. Shells can be used as theoretical toy models to investigate gravitational collapse issues and as possible sources for dark energy and dark matter.

– Hamiltonian gravity: I have been studying the Hamiltonian formulation of gravity and specifically thin shells systems in the canonical framework. In particular I’ve been working on the derivation of equations of motion from variational principles and the Hamiltonian formulation for a system composed of n spherical thin matter shells with general equation of state that correctly reproduces the ADM mass of the system.

I was born in Milan, Italy. I got my masters degree and Ph.D in Milan. During the Ph.D I spent one year at the Institute of Physics of the Polish Academy of Sciences in Warsaw, Poland. I did Postdocs in Poland (Institute if Mathematics of The Polish Academy of Sciences, Warsaw), India (Tata Institute of Fundamental Research, Mumbai) and China (Fudan University, Shanghai). Besides science I have a passion for science fiction (I wrote a novel together with two other people), cinema, theater (I wrote and staged a play in 2007 in Milan) and tennis (I write occasionally for a tennis website and a magazine).

A Brief Review of Relativistic Gravitational Collapse

Daniele Malafarina, **2016** In : Astrophysics of Black Holes: From Fundamental Aspects to Latest Developments

Gravitational collapse to black holes and more

Daniele Malafarina, **2016** In : 1st Karl Schwarzschild Meeting on Gravitational Physics, p. 103-109

Variational priciples and hamiltonian formulation of spherical shell dynamics

Jerzy Kijowski, Giulio Magli, Daniele Malafarina, **2008** In : 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity, p. 2346-2348

Static axially symmetric sources of the gravitational field

Daniele Malafarina, Giulio Magli, Luis Herrera, **2005** In : General Relativity and Gravitational Physics - 16th SIGRAV Conference on General Relativity and Gravitational Physics, SIGRAV04, p. 185-187

A model for a dark matter core at the Galactic Centre

K. Boshkayev, Daniele Malafarina, **2019** In : . 484 , p.3 , p. 3325-3333

Charged particle motion and electromagnetic field in γ spacetime

Carlos A. Benavides-Gallego, Ahmadjon Abdujabbarov, Daniele Malafarina, Bobomurat Ahmedov, Cosimo Bambi, **2019** In : . 99 , p.4

Harmonic oscillations of neutral particles in the γ metric

Bobir Toshmatov, Daniele Malafarina, Naresh Dadhich, **2019** In : . 100 , p.4

Relaxations of perturbations of spacetimes in general relativity coupled to nonlinear electrodynamics

Bobir Toshmatov, Zdeněk Stuchlík, Bobomurat Ahmedov, Daniele Malafarina, **2019** In : . 99 , p.6

Black hole bounces on the road to quantum gravity

Daniele Malafarina, **2018** In : . 4 , p.9

Classical collapse to black holes and quantum bounces

Daniele Malafarina, **2017** In : . 3 , p.2 , p. 48

Observational properties of rigidly rotating dust configurations

Daniele Malafarina, Cosimo Bambi, Batyr Ilyas, Jinye Yang, **2017** In : . 77 , p. 461

Genericity aspects of black hole formation in the collapse of spherically symmetric slightly inhomogeneous perfect fluids

Seema Satin, Daniele Malafarina, Pankaj S. Joshi, **2016** In : . 25 , p.2

Gravitational collapse of Hagedorn fluids

Daniele Malafarina, **2016** In : . 93 , p.10

All black holes in Lemaître-Tolman-Bondi inhomogeneous dust collapse

Pankaj S. Joshi, Daniele Malafarina, **2015** In : . 32 , p.14

Compact objects from gravitational collapse

Daniele Malafarina, Pankaj S. Joshi, **2015** In : . 75 , p.12 , p. 1-8

Gravitational blueshift from a collapsing object

Lingyao Kong, Daniele Malafarina, Cosimo Bambi, **2015** In : . 741 , p. 82-86

Can we observationally test the weak cosmic censorship conjecture?

Lingyao Kong, Daniele Malafarina, Cosimo Bambi, **2014** In : . 74 , p.8 , p. 1-12

Distinguishing black holes from naked singularities through their accretion disc properties

Pankaj S. Joshi, Daniele Malafarina, Ramesh Narayan, **2014** In : . 31 , p.1

Note on the effect of a massive accretion disk in the measurements of black hole spins

Cosimo Bambi, Daniele Malafarina, Naoki Tsukamoto, **2014** In : . 89 , p.12

Singularity avoidance in classical gravity from four-fermion interaction

Cosimo Bambi, Daniele Malafarina, Antonino Marcianò, Leonardo Modesto, **2014** In : . 734 , p. 27-30

Singularity avoidance in quantum-inspired inhomogeneous dust collapse

Yue Liu, Daniele Malafarina, Leonardo Modesto, Cosimo Bambi, **2014** In : . 90 , p.4

Terminating black holes in asymptotically free quantum gravity

Cosimo Bambi, Daniele Malafarina, Leonardo Modesto, **2014** In : . 74 , p.2 , p. 1-10

Instability of black hole formation under small pressure perturbations

Pankaj S. Joshi, Daniele Malafarina, **2013** In : . 45 , p.2 , p. 305-317

Kα iron line profile from accretion disks around regular and singular exotic compact objects

Cosimo Bambi, Daniele Malafarina, **2013** In : . 88 , p.6

Non-singular quantum-inspired gravitational collapse

Cosimo Bambi, Daniele Malafarina, Leonardo Modesto, **2013** In : . 88 , p.4

Circular geodesics and accretion disks in the Janis-Newman-Winicour and gamma metric spacetimes

Anirban N. Chowdhury, Mandar Patil, Daniele Malafarina, Pankaj S. Joshi, **2012** In : . 85 , p.10

Genericity aspects in gravitational collapse to black holes and naked singularities

Pankaj S. Joshi, Daniele Malafarina, Ravindra V. Saraykar, **2012** In : . 21 , p.8

Equilibrium configurations from gravitational collapse

Pankaj S. Joshi, Daniele Malafarina, Ramesh Narayan, **2011** In : . 28 , p.23

Gravitational collapse with tangential pressure

Daniele Malafarina, Pankaj S. Joshi, **2011** In : . 20 , p.4 , p. 463-495

Instability of black hole formation in gravitational collapse

Pankaj S. Joshi, Daniele Malafarina, **2011** In : . 83 , p.2

Naked singularities as particle accelerators. II

Mandar Patil, Pankaj S. Joshi, Daniele Malafarina, **2011** In : . 83 , p.6

Recent developments in gravitational collapse and spacetime singularities

Pankaj S. Joshi, Daniele Malafarina, **2011** In : . 20 , p.14 , p. 2641-2729

The Hamiltonian formulation for the dynamics of a multishell self-gravitating system

J. Kijowski, G. Magli, D. Malafarina, **2010** In : . 51 , p.7

Hamiltonian formulation of spherical shell's dynamics from first principles

J. Kijowski, G. Magli, D. Malafarina, **2009** In : . 64 , p.1-2 , p. 241-247

The general exact solution for relativistic spherical shells

J. Kijowski, G. Magli, D. Malafarina, **2009** In : . 18 , p.12 , p. 1801-1808

New derivation of the variational principle for the dynamics of a gravitating spherical shell

J. Kijowski, G. Magli, D. Malafarina, **2006** In : . 74 , p.8

Lagrangian and Hamiltonian formulation of spherical shell dynamics

J. Kijowska, G. Magli, D. Malafarina, **2005** In : . 2 , p.5 , p. 887-894

Non-spherical sources of static gravitational fields

L. Herrera, G. Magli, D. Malafarina, **2005** In : . 37 , p.8 , p. 1371-1383

– Non-spherical Sources of Static Gravitational Fields: Investigating the Boundary of the No-hair Theorem, Gen. Rel. and Grav. 37, 1371 (2005). (with L. Herrera, G. Magli)

– A New Derivation of the Variational Principle for the Dynamics of Gravitating Spherical Shells, Phys. Rev. D, 74(8), 084017 (2006). (with J. Kijowski, G. Magli)

– The Hamiltonian formulation for the dynamics of a multishell self-gravitating system, J. Math. Phys. 51, 072504 (2010). (with J. Kijowski, G. Magli)

– Naked singularities as particle accelerators II, Phys. Rev. D, 83 064007 (2011). (with P.S. Joshi and M. Patil)

– Recent developments in gravitational collapse and spacetime singularities, Int. J. Mod. Phys. D, 20 2641 (2011). (invited review article, with P.S. Joshi)

– Circular geodesics and accretion disks in Janis-Newman-Winicour and Gamma metric, Phys. Rev. D 85, 104031 (2012). (with P.S. Joshi, M. Patil and A.N. Chowdhury)

– Instability of black hole formation under small pressure perturbations, Gen. Rel. Grav. 45(2), 305 (2013). (with P.S. Joshi)

– Non-singular quantum-inspired gravitational collapse, Phys. Rev. D 88, 044009 (2013). (with C. Bambi and L. Modesto)

– Kα iron line profile from accretion disks around regular and singular exotic compact objects, Phys. Rev. D, 88, 064022 (2013). (with C. Bambi)

– Distinguishing black holes from naked singularities through their accretion disk properties, Class. Quantum Grav. 31, 015002 (2014). (with R. Narayan and P.S. Joshi)

– Terminating black holes in asymptotically free quantum gravity, Eur. Phys. J. C 74, 2767 (2014). (with C. Bambi and L. Modesto)

– Note on the effect of a massive accretion disk in the measurements of black hole spins, Phys. Rev. D, 89, 127302 (2014). (with C. Bambi and N. Tsukamoto)

– Gravitational Collapse of Hagedorn fluids, Phys. Rev. D 93, 104042, (2016).

– Classical Collapse to Black Holes and Quantum Bounces: A Review, Universe 3(2), 48, (2017).

– Observational properties of rigidly rotating dust configurations, Eur. Phys. J. C 77, 461 (2017). (with B. Ilyas, J. Yang and C. Bambi)

To see the full list of publications, click here.

Phys201 – Introductory Astronomy

Phys202 – Introductory Astrophysics

Phys221 – Classical Mechanics I

Phys222 – Classical Mechanics II

Phys463 – Astrophysics and General Relativity

Phys505 – Classical Mechanics (graduate)