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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. 

News

Graspa 2015

Undergraduate Summer School in Particle and Astroparticle Physics of Annecy-le-Vieux, July 16-22 2015

The schoolgraspa 2015 aims at introducing Particle Physics and Astroparticle physics to 4th and advanced 3rd year physics students from anywhere in the world. The most recent research topics and results in these fields will be presented. The school consists of 4 days of lectures on LHC Physics, Neutrinos, Heavy Flavours, Astroparticle Physics and Gravitational Waves. Computational tools for these fields will also be introduced during a hands-on session. The students will be immersed in an international research atmosphere. They will be able to spend time and discuss at length with scientists working in the field.

Courses will be in English. No background knowledge on the topics covered beyond a popular science level is assumed. A strong background in Quantum Mechanics is expected, however.

 

A maximum of 30 students will be admitted.

 

PhysTeV Les Houches 2015

lh 2015

In a few weeks the high energy physics team will be going to Les Houches. We will be overseeing the 9th session of the LH PhysTeV. This session will coincide with the first beams at the LHC which will soon be  running at 13TeV.

The highlight of the 2015 Les Houches Edition is to take full advantage of the data that has been collected at the LHC so far and prepare for the future runs. The Workshop will devote particular attention to:(i) Higgs physics, and how it shapes our view on the mechanism of electroweak symmetry breaking; (ii) related searches for New Physics and (iii) progress in new techniques for the calculations and simulation of Standard Model processes. These activities will be conducted in close connection with the development and improvements of related theory tools, in particular of Monte-Carlo event generators.

The Workshop proper runs over one year, including two meetings in Les Houches in the month of June, and exchanges and collaborations before and after the meetings. The meetings in Les Houches will consist of two sessions:

Session I: 1-10 June 2015with emphasis on SM-related issues

Session II: 10-19 June 2015   with emphasis on New-Physics searches

Site of the LH2015 session   Wiki of LH2015

   

A course on Nonequilibrium Processes

kirone2Kirone Mallick from the Institut de Physique Théorique (IPhT) CEA Saclay is giving a set of lectures describing recent advances   in systems far from equilibrium. After a review of equilibrium thermodynamics, the lectures will introduce  the fascinating identities of Jarzinski and Crooks which quantify the transient violations of the second principle. This will be followed by the fluctuation theorem of Gallavoti-Cohen. Here is the exciting programme

1. Review of statistical physics: Equilibrium versus Non-equilibrium. Dynamics, Detailed Balance and Time-reversal.
2. Out of Equilibrium: Large Deviations, Generalized Detailed Balance and the Gallavotti-Cohen theorem.
3. Work Identities: the Jarzynski and Crooks identities.
4. The Asymmetric Exclusion Process: Exact Results
5. A unifying framework: the Macroscopic Fluctuation Theory.

 

A Possible solution to the Lithium problem?

poulin serpico

Big Bang Nucleosynthesis (BBN) is an admirable achievement of the standard cosmological model as it very precisely predicts the amount of the most abundant elements, in particular hydrogen and helium. On close inspection the picture is marred by a long standing and annoying problem. Though its abundance is extremely small, the standard predicted amount of lithium is  about a factor 3 larger than what observed in some metal-poor stars believed to trace the primordial abundance. Tweaking the theory of BBN to correct the lithium abundance affects that of the hydrogen or helium to an extent that this is ruled out by the Cosmic Microwave Background (CMB).

In a very recent paper, Pasquale D. Serpico and Vivian Poulin (LAPTh, CNRS) have shown that a loophole in the calculation  of the electromagnetic cascades re-opens the possibility of finding an easy way out to the old problem of the lithium abundance.

Read more: A Possible solution to the Lithium problem?

   

A course on cosmology by Wessel Valkenburg

optimized-wessel Starting Monday 20 January Wessel Valkenburg (Lorentz Institute, Leiden Univ., NL) will give a series of 5 lectures on cosmology. The lectures require no prior knowledge of the subject and is addressed to both theorists and experimentalists, physics PhD students and researchers alike.

The 5 lectures Introduction to Cosmology cover
 
1) The universe today: overview of current understanding, based on Planck, WMAP, SDSS, an many more.
2) Cosmic microwave background as the Planck satellite sees it: from radio signals to spectra of perturbations (and back), and the importance of spectra.
3)  Large scale structure from BOSS, CFHTLens, LSST, Euclid: from angles and redshifts to spectra of perturbations (and back), and a bit on the importance of spectra.
4)  Inflation: probing high-energy physics with BICEP2, Planck, and others.
5) What are the most important pitfalls for cosmologists? Confirmation bias, believe vs pragmatic testing, etc. Where is the Nobel prize hiding?
 
For more information see the LAPTh indico : https://indico.in2p3.fr/category/365/

youtube logo smallThe  (6) videos of the lectures can be found on the LAPTh Youtube Channel

 

Habemus Logo

logo lapth webopt1


A new logo is born !


LAPTh has now a new logo! Putting 5 letters in a square was no easy job. Among a hundred of designs and a lot of discussions in the LAPTh patio, restaurant, sometimes heated but always jovial, this was the final choice. The logo comes now in a couple of versions. 

 

 

logo lapth webopt3 cut

   

New Planck results, another one bites the dust

optimized-polar planck

After four years of operation of the Planck satellite of the European Space Agency (ESA), the Planck Collaboration has build up an exquisitely precise map of the sky in both temperature and now of polarisation. These maps furnish a detailed picture of how the universe evolved. Among the numerous results provided by the Planck satellite over the last year, there is an assessment of the polarised dust emission at intermediate and high Galactic latitudes  (http://arxiv.org/abs/1409.5738). This is a crucial foreground in the searches for primordial B-mode polarisation patterns, possibly imprinted in the Cosmic Microwave Background by gravitational waves of  inflationary origin, also known as tensor modes. Thanks to this measurement, older estimates of this contribution have  been revisited and, in a joint effort by the BICEP2/Keck Array and Planck Data collaborations (http://arxiv.org/abs/1502.00612),  no statistically significant evidence for tensor modes has been found in a reanalysis of the BICEP 2 observations, which  in 2014 had been interpreted as a possible primordial B-mode detection  (http://arxiv.org/abs/1403.3985), an interpretation that made big waves in the media then... undeservedly. We will need to wait and be more careful about gravity waves.

 

Group Theory Lectures 2015

grouptheory
Following the success of the course that Paul Sorba gave 2 years ago, our new PhD students and post docs asked Paul to renew the experience. The Group Theory and its Applications course is to be delivered over about 10 sittings.  The course will cover 

1) Elements of group theory and their importance in particle physics

2) Lie groups and Lie algebras

3) Classification of semi-simple Lie algebras

4) Representations of simple Lie algebras

5) Applications: spectroscopy of elementary particles, gauge theory, grand unification models

6) Extensions: superalgebras (for supersymmetry); quantum groups (for integrable systems); exceptional algebras and infinite dimensional algebras (for string theory)

Read more: Group Theory Lectures 2015

   

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