News & Scientific Highlights

#« Big-bang, comprendre l’univers depuis ici et maintenant » de Jean-Philippe Uzan, Flammarion

Oct. 10 2018

Dans son livre grand public intitulé « Big-bang, comprendre l’univers depuis ici et maintenant », paru le 10 octobre 2018 chez Flammarion,

Jean-Philippe Uzan invite ses lecteurs à comprendre la construction du modèle du big-bang, cette théorie qui vise à décrire l’univers et son histoire.

[click here]

#Video interview with Sergei Balashev, Russian researcher and ILP visitor at the IAP

Sept. 26 2018

Sergei Balashev, researcher from the Ioffe Institute of Saint Petersburg, talks about high redshifted galaxies and quasar absorption lines.[see the video]

#Mathieu Guigue : Interview-portrait du nouveau Maître de Conférences de Sorbonne Université


Mathieu Guigue, chercheur en physique expérimentale des neutrinos, vient d’être recruté par Sorbonne Université en tant que Maître de Conférences (MdC).

Son activité d’enseignement commencera à la rentrée 2018.Interview-portrait.

[click here]

#A New Cosmological Ruler to track Dark Energy


A team of cosmologists lead by Stefano Anselmi (Observatoire de Paris & Institut d'Astrophysique de Paris) and composed of Glenn Starkman (Case Western Reserve University), Pier-Stefano Corasaniti (Observatoire de Paris), Ravi Sheth (University of Pennsylvania) and Idit Zehavi (Case Western Reserve University) discovered a new cosmological standard ruler dubbed the "Linear Point".

They apply it to existing galaxy catalogues showing that this pristine ruler is a new promising means to unravel the mystery of Dark Energy. The results have been published on Physical Review Letters on 10 July 2018.

[click here]

#« From Classical to Quantum Fields » de Laurent Baulieu, John Iliopoulos et Roland Sénéor


Le livre « From Classical to Quantum Fields », récemment paru chez Oxford Press, décrit le cadre mathématique de la théorie quantique des champs pour appréhender les interactions fondamentales des particules élémentaires.

Cet ouvrage d’environ 1000 pages, commence par un rappel des théories de l'électrodynamique et de la relativité générale et de leurs propriétés de symétrie. Il explique leur méthode de quantification selon l’approche de l'intégrale de chemin de Feynman.

Certaines sections sont relatives à des sujets rarement abordés dans la littérature pour les étudiants de master et de doctorat.

[click here]

#ILP LabEx Researcher Profile: Ioannis Florakis


Ioannis Florakis is post-doctoral fellow in LabEx «Institute Lagrange of Paris». He answered some questions about his research and projects in theoretical physics.

Below is a transcript of the written interview. [click here]

#Portrait d’un doctorant du LabEx ILP : Andrea Mogini


Andrea Mogini est doctorant du Laboratoire d’Excellence « Institut Lagrange de Paris ». Aujourd’hui, il conduit ses recherches à Paris, au sein du Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE).

Il a accepté de répondre à des questions sur son parcours, ses recherches et ses projets. Transcription d'une interview-portrait. [click here]

#Rencontre de Physique des Particules (RPP)

April 11-13, 2018

The Rencontre de Physique des Particules (RPP) aims at gathering once per year the theoretical physicists working in France in the field of high energy physics. The 2018 meeting will be organised by the Institut Lagrange de Paris (LPTHE, LPNHE and IAP), Jussieu Campus, Sorbonne Université, Paris... [more]

#Machine Learning Workshop

March 29, 2018

The machine learning workshop is at aimed at beginners and those who want to know how to program neural networks. It’s purpose is to bring people up-to-date with various machine learning techniques, with an emphasis on deep learning. Thomas Keck (currently at KIT) will provide the teaching throughout the day, with a few of us to help during the workshop. Thomas has been working on machine learning techniques for the Belle II experiment for several years and has previously held workshops teaching machine learning at the CERN computing summer school and at KIT... [more]

#IHP Trimester 2018: Analytics, Inference, and Computation in Cosmology

Sept. 3 - Dec. 14, 2018

The IHP trimester entitled “Analytics, Inference, and Computation in Cosmology,” will be dedicated not only to the “what” and the “why” but also, and specifically, to the “how” of cosmological calculation. Is the mathematical toolset of cosmology adequate for the challenges ahead? Where do we need new ideas? [more]

#A mechanism that destabilizes the primordial universe

Sept. 28 2016

Physicists from the CNRS and the University of Warsaw unveiled an instability at play in the primordial universe that modifies the theoretical interpretation of the cosmic microwave background observations, and which enables one to severely constrain scenarios of inflation built in fundamental physics. This work is published in Physical Review Letters. [more]

#Chasing the ultimate neutrinos

Sept. 22 2016

Kumiko Kotera, researcher at the IAP and recipient in 2016 of the CNRS bronze medal, talks about her research in high (or even very high) energy astrophysics [see the video]

#Special Breakthrough Prize In Fundamental Physics

May 17, 2016

Luc Blanchet, senior researcher in theoretical physics at IAP/ILP, is one of the laureates of the "Special Breakthrough Prize In Fundamental Physics" awarded for the detection of gravitational waves, confirmation of the prediction by Albert Einstein a hundred years ago. Luc Blanchet made major contribution to the theoretical calculation of the gravitational waveform generated by the coalescence of neutron stars or black holes.
[Read more on IAP website]

#"The ΛCDM model is the our best description of the cosmos... right?"

Feb. 26, 2016

Cosmology@Home attempts to answer this big question and just released a new exciting app to do so! This app (called "planck_param_sims") uses data from the Planck satellite and allows anyone to contribute to their current analysis.
The one sentence summary of this tool is that its sort of like turning contributing computers (yours?) into mixer boards and playing DJ with the echoes of the Big Bang! So what exactly does that mean, and how these results contribute to science?
Find out more on Cosmology@Home website

#Benjamin D. Wandelt elected Fellow of the American Physical Society

Oct. 8, 2015

Ben Wandelt was named 2015 Fellow of the APS in recognition of his outstanding contributions to physics. [more]

#The mysteries of quantum cosmology

Aug. 21, 2015

Patrick Peter, Deputy Director of the ILP, explains to us why quantum cosmology remains a mystery... [see the video]

#"What excites me in being a cosmologist"

Nov. 10, 2014

Benjamin Wandelt, Director of the ILP, explains to us why it is exciting to be a cosmologist. First short video of a long series [see the video]

Universal density profile for cosmic voids

July 8, 2014

Cosmic voids are fascinating for several reasons. For example, they were the first places in the Universe to be dominated by dark energy. They make up the majority of the volume of the Universe today and constitute an exceptional source of cosmological information. [more]

#Louis D. Foundation Award 2014

June 17, 2014

François Bouchet, HFI Planck coPi and ILP member, was recently awarded the 2014 Louis D. Foundation Award [more in French language]

#Detecting Cosmic Rays out in the Pampas

June 2014

In Argentina, the Pierre Auger Observatory hunts cosmic rays, charged particles that shower the Earth from space. A French team headed by A. Letessier-Selvon takes us on a guided tour of the Observatory during their on site mission in 2013 [more]

#Planck takes magnetic fingerprint of our galaxy

May 6, 2014

The Planck team released this image of the first all-sky observations of polarized light emitted by interstellar dust in the Milky Way. Planck member Paul Sutter helped create this visualisation of galactic magnetic field lines at the Lagrange Institute. [more]