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Christophe Ringeval


I am here!

Centre for Cosmology, Particle Physics and Phenomenology,
Institute of Mathematics and Physics,
Louvain University,
Chemin du Cyclotron 2,
1348 Louvain-la-Neuve, (Belgium)

You can email me there !

E-Mail : ringeval At fyma.ucl.ac.be
Office : +32 (0)10 472 075
Fax : +32 (0)10 472 414


The pink panther

What am I doing?

Mainly early universe cosmology which is concerned by the universe viewed as a whole, but before the hundredth of a billonth of a second after the Big Bang.
I have been interested in cosmic strings, a kind of lineic vacuum topological defect, both on the microscopic side with the study of fermionic currents that can flow along these superconducting wires, and on the cosmological side with the search of the signatures they may imprint in the cosmic microwave background radiation (CMB).
I am also working in braneworld cosmology where our spacetime has more than 4 dimensions. In such a framework, modifications of the standard gravity law might be observable on small or very large distances, while the mass quantization of the particles living in our universe could find an explanation from the very existence of the extra dimensions.
I am involved in the cosmological perturbation theory which predicts the temperature fluctuations observed in the CMB from initial conditions set during the radiation era. The physical processes involved in the early universe may let their imprints in these initial conditions, thereby be detectable in the CMB measurements. This may be the case for cosmic strings and extra dimensions.
Inflation is a phase of quasi-exponentially fast expansion of the early universe that seems to be required by the current CMB data. Indeed, besides solving the homogeneity and flatness problem of the standard cosmological scenario, inflation predicts the right initial conditions that lead to the observed CMB temperature fluctuations.
In this framework, I am working on trans-Planckian physics which is concerned by the study of new physics phenomena that could show up around the Planck length, i.e. at the earliest times in the universe history. Inflation acts as a zoom on such tiny lengthes by streaching them to cosmological distances today.
By means of the CMB mesurements, inflation is a powerful tool to probe the particle physics theories in a extraordinary high energy regime, many orders of magnitude greater than the particle physics experiments taking place in accelerators. Hope is to change the status of the most speculative theories as string, M, or quantum gravity theories, from protoscience to science.


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Last modif 09/2013