Diffusion PNCG – n° 215 – 9 juin 2021

1. Kick-off meeting of the Tianguan Sino-French collaboration (15-16th June, Virtual)
2. Sixteenth Marcel Grossmann Meeting on General Relativity (5-9 July 2021, virtual)
3. A Multi-wavelength View of Galaxy Clusters: Deriving Masses in the Era of Wide-field Surveys (6th – 9th of September 2021, Virtual)
4. Ecole de Gif 2021 (13-17 Septembre, Marseille, France)
5. “Debating the potential of machine learning for astronomical surveys” (18th – 22nd October 2021 online and at IAP, Paris)
6. Two CMB Postdoc at Harvard

Envoyez svp vos propositions d’annonces à l’adresse : pncg@iap.fr
Pour vous inscrire ou gérer votre abonnement à la liste PNCG: https://listes.services.cnrs.fr/wws/info/pncg 

1. Kick-off meeting of the Tianguan Sino-French collaboration (15-16th June, Virtual)
Tianguan[1] is a Sino French collaborative project founded 2020, the 1st January. The scientific project is organized around two main science themes, transient sky and galaxy formation for which the collaborations are very strong and active. Tianguan will be organized around a solid exchange program, in particular for young scientists in view of the long-term sustainability of the collaboration. For these purposes, a specific Memorandum of Understanding (MoU) has been recently signed by the National Astronomical Observatories of China, the Yunnan University and the Centre National de la Recherche Scientifique.

We have organized Tianguan around 4 working groups, each of them led by a Chinese and a French co-organizer. They are:

  • Transient sky including the SVOM project;
  • Galaxy formation and Cosmology;
  • Cosmology with transient including with gamma-ray burst galaxies;
  • and Local Group studies.

The goal of the kick-off meeting is to launch this large but well focused collaboration, and to call for support from both Chinese and French community. Given the sanitary situation, the Tianguan kick-off meeting will be fully virtual, and be held on only 2 days, for a presentation the existing collaborations, and the main objectives for which the Sino-French collaboration will aim to be a world-wide lead.

Registration procedure and scientific program can be found below.

[1] Tianguan (天关) is part of the Chinese astronomy and defines a very bright star Zeta Tauri in the sky. It is also very close (and  also used to be associated) to the Crab Nebulae, which progenitor supernova exploded in the year 1054, when Chinese astronomers were the first to take data on this spectacular event.
Transmis par F. Hammer

2. Sixteenth Marcel Grossmann Meeting on General Relativity (5-9 July 2021, virtual)

We are happy to announce that at the Sixteenth Marcel Grossmann Meeting on General Relativity (MG16) ( https://indico.icranet.org/event/1/) there is going to be a parallel session dedicated to “Cosmography with Gravitational Lensing” (https://indico.icranet.org/event/1/program) and we encourage you to submit an abstract.

The MG16 will take place virtually from Monday July 5 through Friday July 9, 2021.

The timeline is:

  • March 15, 2021: registration opening
  • April 15, 2021: abstract submission opening
  • May 15, 2021: registration closure
  • June 15, 2021: abstract submission closure

Each day of the meeting there will be three program blocks of three hours each: one plenary session and two parallel sessions in revolving order to address the three major continental time zones:
Central European Summer Time:
Block 1: 6:30-9:30
Block 2: 9:30-12:30
Block 3: 16:30-19:30

Transmis par M. Hafizi

3. A Multi-wavelength View of Galaxy Clusters: Deriving Masses in the Era of Wide-field Surveys (6th – 9th of September 2021, Virtual)

Abstract submission is open until the 30th June 2021: https://www.cosmos.esa.int/web/cluster-mass-2020/



Powerful new galaxy surveys Euclid, The Dark Energy Survey, eROSITA and LSST offer outstanding potential for both cluster cosmology and galaxy evolution. With these wide-field surveys across a variety of wavelengths and redshifts, we are moving into an era where samples of hundreds of thousands of galaxy clusters will be available. While these large samples enable the reduction of statistical uncertainties in our measurements, developments in modelling both our observations and theoretical understanding of galaxy clusters is crucial to the success of these surveys. The aim of this meeting is to bring together observers and theorists to discuss recent results and future prospects for deriving cluster masses in light of current and upcoming wide-field surveys.

This will be a small-medium sized meeting with oral and poster contributions alongside discussion sessions covering the following themes:

  • Theme 1: observational measurements & progress on:
    Galaxy cluster masses derived from galaxies
    • Galaxy cluster masses derived from gravitational lensing
    • Galaxy cluster masses derived from X-rays
    • Galaxy cluster masses derived from the Sunyaev-Zeldovich effect
    • Machine learning applications to galaxy cluster mass estimation techniques

(Subthemes are inclusive of multi-wavelength comparisons).

  • Theme 2: galaxy cluster detection & mass estimation in the context of upcoming surveys (e.g., Euclid, eROSITA, LSST, JWST, Simons Observatory, CMB-S4, Athena, Lynx).
  • Theme 3: a view from galaxy cluster simulations (dark matter-only, hydrodynamical, synthetic skies etc.).
  • Theme 4: statistical challenges in galaxy cluster cosmology.

The virtual meeting will be held at 15:30 – 19:30 CET on 6th-9th September 2021. To facilitate participation across different time zones, it will be possible to pre-record presentations. All presentations will be recorded and uploaded as soon as possible for viewing by participants during the meeting.

We acknowledge support from the Faculty of the European Space Astronomy Centre (ESAC).

Abstract submission deadline: 30th June 2021
Registration deadline: 23rd August 2021
Meeting: 6th – 9th September 2021
Contact: bruno.altieri@sciops.esa.intlyndsay.old@esa.int

transmis par G. Mamon

4. Ecole de Gif 2021 (13-17 Septembre, Marseille, France)

L’Ecole de Physique des Particules de l’IN2P3, dite Ecole de Gif, est la plus ancienne des écoles thématiques de l’IN2P3. Elle est destinée en premier lieu aux jeunes expérimentateurs. Toutefois, son objectif étant de traiter le thème de la session jusque dans ses développements les plus délicats et actuels, elle est ouverte à tout chercheur intéressé, expérimentateur ou théoricien.

La 52e édition de l’Ecole de Gif portera sur “Au-delà du Modèle Standard de la Cosmologie”. Cette session 2021 est organisée par les laboratoires marseillais CPPM, CPT et LAM.
Les inscriptions sont désormais ouvertes : https://indico.in2p3.fr/e/Gif2021

Elle aura lieu à Marseille du 13 au 17 septembre 2021, à la Station Marine d’Endoume.

Cette école s’adresse aussi bien aux chercheurs confirmés qu’aux doctorants (y compris ceux commençant leur thèse à l’automne 2021) et post-doctorants.

L’école de Gif est libre de frais d’inscription pour les personnes rattachées au CNRS ou au CEA dont l’hébergement est également pris en charge.

Transmis par le comité d’organisation de l’Ecole de Gif 2021

5. “Debating the potential of machine learning for astronomical surveys” (18th – 22nd October 2021 online and at IAP, Paris)
Registration opens the 15th of June !
The 2021 IAP colloquium is dedicated to a critical look at the utility of machine learning techniques for astronomical surveys.

A major revolution is now underway in astrophysics with the constant arrival of ever-richer and more complex datasets. To address the most pressing questions facing astrophysics, the next generation of surveys will generate orders of magnitude more data than before. Unfortunately, the limitations of current analysis techniques to exploit these data are becoming increasingly apparent. There is now widespread hope that deployment of “machine learning” techniques pioneered by the computer industry can provide a way to extract the maximum amount of science from these new surveys, and these new methods are being enthusiastically adopted by astronomers. However the precision, reproducibility and explicability requirements of the computer industry are not the same as that of the astronomical community.

It is therefore very timely to survey the landscape of machine-learning techniques in astronomy and to evaluate their efficacy in solving astrophysical problems. The conference will explore the potential and applicability of machine learning techniques for current and future surveys such as DESI, SKA, Euclid, Rubin Observatory, Ariel and Gaia. In particular the impact of systematic errors on the reliability of inferred parameters (cosmological or otherwise) derived using these methods will be explored. The ability of machine-learning models to lead to scientific discoveries will be critically discussed.

The conference will be remote with in-person attendance possible for a limited number of people. In order to make the conference as interactive as possible in a hybrid setting we will broadly follow the successful example set by the Machine Learning debate series and end each day with a debate addressing questions selected by the Science Organising Committee, such as:

  • What can machine learning not do … yet?
  • What would it take for the community to accept the results of machine-learning-powered research?
  • Can machine learning models be considered on the same footing as physical models?
  • How do we understand what the machine has understood?
  • What flavours of machine learning techniques are most appropriate for astronomy?

More information can be found at the conference website: https://ml-iap2021.sciencesconf.org/

transmis par G. Lavaux, K. Benabed, H. McCracken

6. Two CMB Postdoc at Harvard

Application Deadline: Tuesday, August 31, 2021
Selection Deadline: Wednesday, September 15, 2021

The Harvard CMB group invites applications for two Harvard Postdoctoral Fellow positions to pursue research related to cosmic microwave background measurements with the BICEP Array telescopes, the South Pole Observatory, and CMB Stage 4. The multi-institutional BICEP program produces extremely deep maps of polarization of the CMB at multiple frequencies from the South Pole, measuring gravitational lensing and galactic foregrounds and placing leading constraints on primordial gravitational waves. The BICEP Array project is upgrading the current program with new instrumentation to include over 30,000 detectors and five frequency bands, to be deployed and operated over the next five years. The program will continue to produce maps with groundbreaking sensitivity, while validating technologies and methodologies essential to Stage 3 and Stage 4 CMB science goals. A major focus is analysis of current and upcoming BICEP data, including joint analysis with data from the 10m South Pole Telescope and external datasets, to continue to improve lensing measurements, component separation, and constraints on primordial cosmology, as well as forecasting and design optimization for future efforts. These include the operational South Pole Observatory and the ongoing instrument development for the Small Aperture Telescopes of CMB Stage 4.

Successful candidates will play a variety of leading roles spanning receiver and telescope design, instrumentation development, deployment and operation, real time control code, optimization of data reduction and simulation on leading HPC infrastructure at Harvard and NERSC, and development of high-level analyses for survey combination and cosmological interpretation. Applicants should indicate which roles best match their experience and interest. Successful candidates will actively represent this research at conferences and take leading roles in preparation of results for publication. The postdoctoral fellow positions offer a highly competitive salary, an independent research fund and an allowance for relocation expense. The position will be renewed annually based on satisfactory performance, for an expected total length of three years. Joint appointments with collaborating institutions are possible and may be considered on a case by case basis. Applications will be reviewed starting January 2021 and will continue to be accepted until all positions are filled.

Envoyez svp vos propositions d’annonces à l’adresse : pncg@iap.fr
Pour gérer votre abonnement à la liste PNCG: https://listes.services.cnrs.fr/wws/info/pncg