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Laboratoire d'Annecy-le-Vieux de
Physique Théorique


LAPTh, an overview

LAPTh is a mixed research unit (UMR 5108) of the CNRS lapth-lapp(within the Institute of Physics, INP) and the Université de Savoie. It is  located in Annecy-le-Vieux, 5km from the centre of Annecy and about 40km from CERN and Geneva.  The activities of LAPTh are centred around three main areas of research:

  • phenomenology of particle physics,
  • astroparticles and cosmology,
  • mathematical physics in particular field and string theory and  aspects of symmetry. 


Planck Results

 planck resultsCongratulations to the Planck Team and to our colleague Julien Lesgourgues for their remarkable study of the temperature fluctuations of the CMB. This study has now given us the oldest map of the Universe, going back 400,000 years after the Big Bang, a snapshot with exceptional detail that will remain a reference for cosmological analyses. We now have a very accurate reconstruction of the composition of the "cosmic soup" which, in combination with other cosmological observables, offers a remarkably simple and coherent framework within the "standard cosmological model" thus providing very interesting constraints on relevant aspects of particle physics such as the number and the mass of neutrinos.

This wealth of data also revealed a few anomalies. In the months and years ahead, we will learn from these analyses whether we should go beyond the standard cosmological model. Furthermore, other ongoing analyses of the data address the polarization of the radiation. This will improve the chances of detecting other phenomena such as the presence of a diffuse background of gravitational waves.


Pierre Salati in Pour la Science (Scientific American)


 The issue 426 (April 2013) of the magazine Pour la Science, the French edition of Scientific American, is devoted to a lengthy article on dark stars. It is written by Katherine Freese (University of Michigan, USA), Paolo Gondolo (University of Utah, USA) and our colleague Pierre Salati.

Several measurements in astrophysics and cosmology indicate the presence of a new type of matter, dark matter. Dark matter represents no less than 85% of the matter content of the Universe. The most plausible hypothesis is that dark matter consists of new, electrically neutral and weakly interacting particles.

Many theories describing physics beyond the standard model of particle physics incorporate dark matter candidates. Dark stars, that are,  oddly enough, brighter than a thousand suns, draw their energy from the annihilation of these dark matter candidates.


Serpico awarded the CNRS Bronze Medal

pasqualeOur colleague Pasquale Serpico is awarded the 2013 CNRS bronze medal. This is in recognition of his work and achievements is astroparticle physics and in cosmology. cnrs bronze


Les Houches 2013

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The next session of the PhysTeV Workshop initiated by LAPTh physicists in 1999 and organized every two years since then, will take place in Les Houches as usual from 3-21 June 2013. This series of workshops has contributed much to the physics of the LHC by bringing together in an a relatively secluded place theorists and experimentalists working either towards a better precision for the standard model observables or on new models and theories for the New Physics. This has led, among other things, to the many celebrated Les Houches Accords and Les Houches Recommendations. 2013 will be the year where we will finally discuss the impact of the newly discovered resonance, which is probably the long sought after LH, …oups Le Higgs. 

For more details, see the Phys TeV 2013 webpage


Cosmic drift, an article by P. Serpico highlighted


Spectral Breaks as a Signature of Cosmic Ray Induced Turbulence in the Galaxy

 Pasquale Blasi, Elena Amato, and Pasquale D. Serpico, Phys. Rev. Lett. 109, 061101 (2012).

This article has been selected as a special highlight in Physics Synopsis

Read more: Cosmic drift, an article by P. Serpico highlighted


LAPTh co-organiser of a High Energy School in Turkey

erasmus turkey partnersLAPTh is partner in an  ERASMUS Intensive Programme whose project coordinator is METU (Middle East Technical University), Ankara, Turkey. The consortium organised the  International Summer School on High Energy Physics:”Standard Model and Beyond”  funded in part by the EU and the Turkish National Agency-Life Long Learning. Our first year doctoral students took part in the school which was held in Antalya from 28 August to 8 September 2012. See the site of the School for more details. 


Higgs Discovered at the LHC?

cms higgsjul04 2012On the 4th of July both of ATLAS and CMS, the two multi-purpose detectors at the LHC have announced that they have established, with a very high degree of confidence, the existence of a resonance at the LHC. This is most probably the long sought after Higgs. The physics of the Higgs is the topic of many researchers at LAPTh (See here a list of publications by LAPTh physicists with Higgs in the title..).

Read more: Higgs Discovered at the LHC?


Fawzi Boudjema in the magazine, La Recherche

fawzi recherche2012Fawzi Boudjema is interviewed in a special issue of the magazine La Recherche dated July/August 2012. The special issue is entitled the Physics of the 21st Century. The contribution of our colleague covered supersymmetry and the Higgs in particular in the context of the LHC. This was a well timed interview since the publication of the magazine coincided with the CERN annoucement that a new particle, most probably the missing Higgs, has been discovered.


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