Institut de Physique Théorique
Direction des Sciences de la Matière  - CEA-Saclay
Unité de Recherche Associée au CNRS
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Sunday, July 05, 2015

Welcome to IPhT



Monday, Jul 06, 2015

11h00 Séminaire de physique mathématique

Séminaire de physique mathématique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Nikita Nekrasov

Thursday, Jul 09, 2015

14h00 Soutenance de thèse de doctorat

Soutenance de thèse de doctorat

Amphi Claude Bloch, Bât. 774 Orme des Merisiers

Yunfeng JIANG

The Institut de Physique Théorique (IPhT) is a laboratory of fundamental research, located in Saclay, about 20 km south-west of Paris.

The research performed at the IPhT aims at better understanding the laws which govern our universe and its organisation. It encompasses most of the great subjects of modern theoretical physics:

The IPhT comprises about fifty permanent physicists (2/3 CEA, 1/3 CNRS), about thirty PhD students and postdocs, assisted by a support staff of about ten people. The IPhT also hosts permanently many short term visitors.


Conference "de Sitter and microstate lansdscapes in string theory"   

imgThe conference "de Sitter and microstate lansdscapes in string theory" took place at IPhT from June 16 to 19, 2015. This workshop gathered 70 participants from around the world to discuss recent advances in understanding the landscapes of de Sitter spaces in string theory on one hand, and of black hole microstate geometries on the other. Both landscapes have experienced quite intense recent remodeling: on the black hole side this was driven by “fuzzball/firewall” information-theory-based arguments that black hole solutions are only thermodynamic approximations that stop describing the physics at the scale of the horizon, where they should be replaced by horizonless geometries dual to the black hole microstates, and on the cosmology side by the realization that antibranes, which are one of the key ingredients needed to obtain a landscape of de Sitter vacua, may give rise to instabilities. 

F. David, 2015-07-03


Anomalous diffusion and fluctuations of a tracer particle   


Single-file diffusion is referred to the motion of many interacting particles in one-dimensional channel which are so narrow that the particles can not pass each other, and as a result their sequence is preserved over time. Since its introduction more than 50 years ago, in modelling ion transport through cell membranes, the single-file diffusion has been observed in a wide variety of systems, e.g. diffusion of large molecules in zeolites, carrier migration in super ionic conductors, sliding of proteins along DNA, and many more.The characteristic feature of single-file diffusion is that, the variance of the displacement of a tracer particle at a time much larger than the mean collision time, scales as the square-root of time, compared to the linear dependence in normal diffusion. This sub-diffusive scaling has been demonstrated in a number of experimental realization. Comparatively, theoretical analysis has proved to be a challenging many-body problem, mostly because the motion of the ...

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F. David, 2015-06-19


Bending of Light in Quantum Gravity   

imgA century ago Albert Einstein used his new theory of gravity – the general relativity - for evaluating the bending angle of rays of light under the gravitational pull from the Sun. Ludovic Planté, Pierre Vanhove and their colleagues have evaluated for the first time the quantum gravity correction to this bending angle.

The computation is done in the framework of the low-energy effective field theory, which allows evaluating large distance effects by keeping only low energy fields and couplings. This contribution is universal to any theory of quantum because since it is independent of (any unknown) high-energy degrees of freedom.

The quantum correction depends on the spin of the deflected massless particle, in contrast to the classical contribution. Therefore it violates the equivalence principle but preserves the fundamental symmetries of the theory on which Einstein based his theory of general relativity.

"Bending of Light in Quantum Gravity", N. E. J. Bjerrum-Bohr, John F. Donoghue, Barry R. ...

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C. Pepin, 2015-04-08


RNA: The unknotted strands of life

Liouville Quantum Gravity on the Riemann Sphere

A new, yet faster, version of FastJet

Uncovering the spatial structure of mobility networks

Spin Vertex and 3 Point Function in AdS/CFT Correspondence

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