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Claudia de Rham

Portrait de Claudia de Rham
Visiting Fellow

Areas of Research:
Cosmology,
Particle Physics
Website: http://theory.physics.unige.ch/~claudia/
Phone: +44 (0)20 7594 7841

Research Interests

The essence of this cosmological paradigm is that the Universe is filled with 70% of an energy with negative pressure, designated as "dark energy", 25% of very weakly interacting particles, known as "dark matter" and only 5% of standard baryonic matter. At the same time, Cosmology has become an important laboratory on which recent ideas of string theory and high energy physics can be explored and low-energy phenomenology studied.
Despite its success, the present cosmological paradigm presents many puzzles which remain to be explained. In particular, how did classical spacetime begin or emerge from the quantum realm? Why did inflation occur? Is there any realistic alternative to inflation? What is the this dark energy which represents about 70% of the Universe's total energy budget? More puzzling even, is the cosmological constant problem which states that if dark energy corresponds to vacuum energy, it would be 10^120 orders of magnitude smaller that would be expected from particle physics models.

My recent research has spread from proposed solutions to the cosmological constant problem, and to its close cousin, the Hierarchy problem, and has also focused on observational signatures of braneworld models arising from string theory and that can give rise to more natural realization of inflation.

Recent Publications

  • Flat 3-Brane with Tension in Cascading Gravity, Claudia de Rham, Justin Khoury, Andrew J. Tolley, Phys.Rev.Lett.103:161601,2009, arxiv:hep-th/0907.0473
  • Effective Field Theories and Matching for Codimension-2 Branes, C.P. Burgess, D. Hoover, C. de Rham, G. Tasinato, JHEP 0903:124,2009, arxiv:hep-th/0812.3820
  • Claudia de Rham, Stefan Hofmann, Justin Khoury, Andrew J. Tolley, Cascading Gravity and Degravitation, JCAP0802:011,2008, arXiv: 0712.2821
  • Claudia de Rham, Stefan Hofmann, Justin Khoury, Andrew J. Tolley, Cascading Gravity and Degravitation, JCAP0802:011,2008, arXiv: 0712.2821
  • Claudia de Rham, Scott Watson, Living on a dS brane: Effects of KK modes on inflation, Class.Quant.Grav.24:4219-4234,2007, arXiv: hep-th/0702048
  • A. J. Tolley, C.P. Burgess, C. de Rham, D. Hoover, Scaling Solutions to 6D Gauged Chiral Supergravity, NewJ.Phys.8:324,2006, arxiv:hep-th/608083
  • Andrew J. Tolley, C. P. Burgess, Claudia de Rham, D. Hoover, Exact Wave Solutions to 6D Gauged Chiral Supergravity, JHEP0807:075,2008, arXiv: 0710.3769
  • Claudia de Rham, The Effective Field Theory of Codimension-two Branes, JHEP01(2008)060, arXiv: 0707.0884
  • Claudia de Rham, Scott Watson, Living on a dS brane: Effects of KK modes on inflation, Class.Quant.Grav.24:4219-4234,2007, arXiv: hep-th/0702048
  • C.P. Burgess, C. de Rham, D. Hoover, D. Mason, A.J. Tolley, Kicking the Rugby Ball: Perturbations of 6D Gauged Chiral Supergravity, JCAP0702:009,2007, arxiv:hep-th/610078
  • Kicking the Rugby Ball: Perturbations of 6D Gauged Chiral Supergravity, C.P. Burgess, C. de Rham, D. Hoover, D. Mason, A.J. Tolley, JCAP0702:009,2007, arXiv: hep-th/0610078
  • A. J. Tolley, C.P. Burgess, C. de Rham, D. Hoover, Scaling Solutions to 6D Gauged Chiral Supergravity, NewJ.Phys.8:324,2006, arxiv:hep-th/608083
  • Claudia de Rham, Andrew J. Tolley, Mimicking Lambda with a spin-two ghost condensate, JCAP0607:004,2006, arXiv: hep-th/0605122
  • Tetsuya Shiromizu, Shunsuke Fujii, Claudia de Rham, Hirotaka Yoshino, High-energy effective theory for orbifold branes, Phys.Rev. D73 (2006) 087301, arXiv: hep-th/0602032
  • Claudia de Rham, Andrew J. Tolley, Gravitational Waves in a Codimension Two Braneworld, JCAP0602:003,2006, arXiv: hep-th/0511138
  • Claudia de Rham, Shunsuke Fujii, Tetsuya Shiromizu, Hirotaka Yoshino, High-energy effective theory for a bulk brane, Phys.Rev. D72 (2005) 123522, arXiv: hep-th/0509194
  • Claudia de Rham, Samuel Webster, High-energy effective theory for matter on close Randall Sundrum branes, Phys.Rev. D72 (2005) 064013, arXiv: hep-th/0506152
  • Claudia de Rham, Samuel Webster, High-Energy theory for close Randall Sundrum branes, Phys.Rev. D71 (2005) 124025, arXiv: hep-th/0504128
  • Claudia de Rham, Beyond the Low Energy Approximation in Braneworld Cosmology, Phys.Rev. D71 (2005) 024015, arXiv: hep-th/0411021
  • A manifestly gauge invariant realization of massive gravity, Claudia de Rham, arXiv: 0910.5474

Seminars

  • "The accelerating Universe and Dark Energy", Kenyon College, Ohio
  • "Massive gravity: A new way", Cosmo '09, cern
  • "Cascading Gravity and Degravitation", Desy, Pascos '09
  • "Cascading Gravity and Degravitation", Case Western Reserve University
  • "Cascading Gravity and Degravitation", Miami
  • "Towards Cosmology in IR Modified Gravity", PSI-G workshop, APC, Paris
  • "Cascading Gravity and Degravitation", Theory Canada 4, UQAM, Montreal
  • "The Hierarchy Problem and the Self-Localized Higgs", Nordita
  • "Field theory on codimension-two branes and the Hierarchy problem", Minneapolis
  • "The CC problem and Codimension-two branes", McGill
  • "Living on a Cod-2 brane", Yukawa Institute, Kyoto
  • "The cosmological constant problem and cod-2 branes", TITech, Tokyo
  • "The effective theory of Codimension-two branes", Caltech, Pasadena & CCPP, NYU & Cosmo Sussex & Pascos, Imperial College
  • PIRSA:08120041, Introduction to Cosmology, 2008-12-09, Young Researchers Conference 2008
  • "Coupling renormalization on Cod-2 brane", PITA joined seminar
  • "Extra spatial dimensions", Black Hole session, public talk
  • 'Gravitational Waves in a Codimension-two Braneworld', Cosmology Seminar