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Marc Casals

Portrait de Marc Casals
University College Dublin

Area of Research:
General Relativity

Research Interests

My research can be roughly divided into the following three areas:

(1) Self-force for Extreme Mass-Ratio Inspirals. The motion of a 'small', compact astrophysical object around a supermassive black hole deviates from geodesic motion due to the action of its own field - the self-force. I develop methods for the calculation of the self-force and the gravitational waveforms emitted during such inspiral. The main method I develop is the calculation of the self-force via the Green function of the wave equation for black hole perturbations.

(2) Quantum Field Theory in Curved Space-time. In the absence of a full theory of Quantum Gravity, one may gain a revealing insight into such a theory in the limit when the scales of the physical system are much larger than the Planck scales by quantizing the "€˜matter" fields and treating the gravitational field classically. I investigate various quantum states of physical interest of the field in different curved space-times.

(3) Higher-dimensional Space-times. String theory suggests that our 4- dimensional world (the "€˜brane") is embedded in a higher-dimensional spacetime (the "€˜bulk") where the size of the extra dimensions may be as large as 1mm, leading to the thrilling prospect of creation of miniature, "€˜brane" black holes in the Large Hadron Collider at CERN. Such black holes would emit Hawking radiation and would evaporate in only fractions of a second. I model the evaporation of rotating "brane" black holes.

Positions Held

  • 2008 - 2010: School of Mathematical Sciences, Dublin City University, Ireland, and CENTRA-Instituto Superior Técnico, Lisboa, Portugal. Research Fellow
  • 2005 - 2008: School of Mathematical Sciences, University College Dublin, Ireland. Postdoctoral Researcher
  • 2003 - 2006: School of Mathematical Sciences, University College Dublin, Ireland. Fixed-Term Lecturer


  • IRCSET Marie Curie Fellowship

Recent Publications

  • M.Casals, E.Poisson and I.Vega, "Regularization of Static Self-forces", Phys. Rev. D, 86, 2012, 064033, arXiv: 1206.3772 [gr-qc].
  • M.Casals and A.C.Ottewill, "Spectroscopy of the Schwarzschild Black Hole at Arbitrary Frequencies", Phys. Rev. Lett., 109, 2012, 111101, arXiv: 1205.6592 [gr-qc].
  • M.Casals and A.C.Ottewill, "The Branch Cut and Quasi-normal Modes at Large Imaginary Frequency in Schwarzschild Space-time", Phys. Rev. D, 86, 2012, 024021, arXiv: 1112.2695 [gr-qc].
  • M.Casals and B.Nolan, "A Kirchhoff Integral Approach to the Calculation of Green Functions beyond the Normal Neighbourhood", Phys. Rev. D, 86, 2012, 024038, arXiv: 1204.0407 [gr-qc].
  • "Analytic Investigation of the Branch Cut of the Green Function in Schwarzschild Space-time", M.Casals and A.C.Ottewill, arXiv: 1210.0519 [gr-qc].
  • "Kermions: Quantization of Fermions on Kerr Space-time", M.Casals, S.Dolan, B.Nolan, A.Ottewill and E.Winstanley, arXiv: 1207.7089 [gr-qc].


  • "Quantum Field Theory of Fermions on Kerr Black Holes", University of British Columbia, Vancouver, Canada.
  • "Self-force for EMRIs", Canadian Institute for Theoretical Astrophysics, Toronto, Canada.
  • "Quantum States for Fermions in Kerr", "21st Midwest Relativity Meeting" at University of Illinois at Urbana-Champaign, U.S.A.
  • "Progress on the Method of Matched Expansions in Schwarzschild", "14th Capra Meeting on Radiation Reaction" at University of Southampton, England.