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ECU meeting: EPFL/CERN/UNIGE Joint Encounters

Europe/Zurich
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

100
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Fabien Lacasa (UNIGE), Jonatha Blazek (EPFL), Wessel Valkenburg (EPFL), Zvonimir Vlah (CERN)
Description

In order to foster collaboration among various cosmology groups in the Léman area, we hold a joint discussion session every month and a half. 

In these, recent news in the field is addressed by experts at a level that we can all understand. Please, suggest papers/subjects to the local organizers.

Participants
  • Alvise Raccanelli
  • Andreas Finke
  • Andrei Khmelnitsky
  • Athanasios Lahanas
  • Basundhara Ghosh
  • Camille Bonvin
  • Charles Dalang
  • Cheng Zhao
  • David Andriot
  • Elisabetta Majerotto
  • Enis Belgacem
  • Fabien Lacasa
  • Farbod Hassani
  • Francesca Lepori
  • Gabriele Franciolini
  • Goran Jelic-Cizmek
  • James Chan
  • Jonathan Blazek
  • Joyce Byun
  • Jérémie Francfort
  • Kai Hoffmann
  • Lucas Lombriser
  • Martin Kunz
  • Nikolaos Tetradis
  • Paul Martens
  • Pierre Fleury
  • Rodrigo von Marttens
  • Ryo Namba
  • Rémy Joseph
  • Sander Mooij
  • Sheean Jolicoeur
  • Tomohiro Fujita
  • Valerio De Luca
  • Viraj Nistane
  • Yves Dirian
  • Zvonimir Vlah
    • 09:00 09:30
      coffee 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      40
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    • 09:30 10:30
      Signatures of Cosmic Reionization on the 21cm 3-Point Correlation 1h 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      100
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      Constraints on reionization models from future 21cm observations will rely on the statistical characterization of the spatial fluctuations in the observed 21cm brightness temperature. So far studies have focused almost exclusively on second-order statistics, such as 2-point correlations, to characterize these fluctuations, neglecting a significant amount of information, which is encoded in the higher-order statistics. I will present a study of the 21cm 3-point correlation in configuration space, as predicted by a semi-numerical simulation. The results show a strong dependence of the 3-point correlation on the triangle shape, as we probe the morphology of large-scale fluctuations in the 21cm signal. This behavior changes strongly for different reionization scenarios and can hence be used to tighten observational constraints from the 2-point correlation on the latter. I will further discuss a physical interpretation of 21cm correlations during reionization in terms of the local quadratic bias model as well a simple approach for generating fast predictions for 21cm observations using random walks.

      Speaker: Kai Hoffmann
    • 10:30 10:45
      break 15m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      40
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    • 10:45 11:30
      Planck Legacy 45m 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      100
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      I will discuss the cosmological legacy from the Planck mission, with the 2018 constraints on cosmological parameters, with emphasis on the dark energy and modified gravity results.

      Speaker: Martin Kunz
    • 11:30 11:45
      break 15m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      40
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    • 11:45 12:30
      Recent progress in the theory of LSS 45m 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      100
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      In this talk, I will review some successes of perturbation theory approach to clustering of dark matter and biased tracers, including calculations of the broadband of the power spectrum, BAO resummation and the prediction of the shape of the BAO peak in the correlation function. I will also briefly talk about some more recent results, such as fast algorithms for calculating loop integrals, perturbation theory inspired reconstruction schemes and what can we learn from comparisons with simulations on the level of realizations.

      Speaker: Marko Simonović
    • 12:30 13:00
      lunch 30m 501/R-014 Restaurant 1

      501/R-014 Restaurant 1

      CERN