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Moritz Munchmeyer

Portrait de Moritz Munchmeyer
Senior Postdoctoral Fellow
Phd: LPNHE Pierre and Marie Curie University 2012

Areas of Research:
Phone: (519) 569-7600 x6108

Research Interests

I'm a cosmologist working at the interface of cosmological theory and data analysis. The main goal of my research is to find new ways to test and constrain fundamental physics with cosmological data. The initial perturbations of the universe are believed to have been created by a quantum process, and the statistical properties of the resulting density field contain information about the ultra high energy physics of the primordial universe.

Recently I have worked on using the cross correlation of the kinetic Sunyaev Zeldovich effect (kSZ) in the CMB and galaxy surveys to reconstruct the large-scale velocity field of the universe. With my collaborators I have proposed an optimal estimator for this reconstruction and shown that it has high signal-to-noise in upcoming experiments. This velocity reconstruction is a new source of information for cosmologists that has already found multiple interesting applications. In particular I have led the development of a method to constrain primordial non-Gaussianity of the local type using the kSZ velocity field and a tracer of galaxies, which will lead to improved constraints with respect to previous methods on the important fnl parameter.

Another area of my research is finding or constraining massive particles during inflation. In principle the density perturbations created by inflation are sensitive to much higher masses than could ever be probed with a terrestrial collider and thus "cosmological collider physics" could give unique insights into ultra high energy particle physics. In many cases such a measurement would require futuristic experimental data and I have worked on forecasting the sensitivity of different experimental setups. For some theoretical models, even current CMB data can be used to obtain interesting and new constraints on massive states. In previous and ongoing work I am searching for such signatures in Planck CMB data. Cosmological collider physics is still a young field and I believe there will be interesting developments in the years and decades to come.

I am an external collaborator of both the Planck experiment and the Simons Observatory, and have contributed data analysis and forecasts to papers of these collaborations. I am also contributing to the Modern Inflationary Cosmology collaboration within the Simons Foundation Origins of the Universe Initiative.

Positions Held

  • 2014, 2015 CNES postdoc, Institute d'Astrophysique Paris (IAP)
  • 2013 Lagrange Fellowship, Institut Lagrange de Paris, Institute d'Astrophysique Paris (IAP)

Recent Publications

  • Anne-Sylvie Deutsch, Matthew C. Johnson, Moritz Münchmeyer, Alexandra Terrana, Polarized Sunyaev Zel'dovich tomography Journal of Cosmology and Astroparticle Physics, Volume 2018, April 2018, arXiv: 1705.08907
  • P. Daniel Meerburg, Moritz Munchmeyer, Julian B. Muñoz and Xingang Chen, Prospects for cosmological collider physics, Journal of Cosmology and Astroparticle Physics, Volume 2017, March 2017, arXiv: 1610.06559
  • The Simons Observatory Collaboration, The Simons Observatory: Science goals and forecasts arXiv: 1808.07445
  • Planck Collaboration Planck 2018 results. X. Constraints on inflation arXiv: 1807.06211
  • Planck Collaboration Planck 2018 results. I. Overview and the cosmological legacy of Planck arXiv: 1807.06205
  • Anne-Sylvie Deutsch, Emanuela Dimastrogiovanni, Matthew C. Johnson, Moritz Münchmeyer, Alexandra Terrana Reconstruction of the remote dipole and quadrupole fields from the kinetic Sunyaev Zel'dovich and polarized Sunyaev Zel'dovich effects arXiv: 1707.08129

Seminars

  • Constraining fnl with kSZ tomography, The Nonlinear Universe 2018 conference
  • kSZ tomography for cosmology, CCA Flatiron Institute New York
  • kSZ tomography for cosmology, Cambridge University
  • Velocity reconstruction with the kSZ effect, CITA
  • kSZ tomography for cosmology, Imperial College London
  • UV signatures in cosmological data, Stanford University
  • UV signatures in cosmological data, Berkeley University