KICP Seminars & Colloquia, Current and Future
Upcoming Seminars

Seminar schedule for Current (Summer 2015) & Future Quarters
July 21, 2015
Open Group seminar
Giulio Fabbian
SISSA-Trieste
Modeling and measuring CMB lensing in the cross-correlation era   [Abstract]
August 6, 2015
Open Group seminar
Chihway Chang
ETH Zurich
The invisible landscape - Weak lensing mass maps with the Dark Energy Survey and beyond   [Abstract]
October 2, 2015
Friday noon seminar
Moritz Munchmeyer
Institute d'Astrophysique Paris
Oscillations in the CMB bispectrum   [Abstract]
October 16, 2015
Friday noon seminar
Rampei Kimura
New York University
Healthy solutions in the decoupling limit of quasi-dilaton theory   [Abstract]
October 28, 2015
Wednesday colloquium
Marc Kamionkowski
Johns Hopkins University
The Future of Cosmological Physics: New Avenues
 
Wednesday colloquia
KICP Wednesday Colloquia: Unless otherwise noted, all talks are held in BSLC 115 at 3 PM on Wednesdays. A reception will be held in the LASR conference room following the talk.

  • October 28, 2015 | 3:00 PM | BSLC 115
    The Future of Cosmological Physics: New Avenues
    Marc Kamionkowski, Johns Hopkins University
    Note: Reception at 4 PM in the LASR conference room.

 
Friday noon seminars
KICP Friday noon seminar: Unless otherwise noted, all talks are held in LASR conference room at Noon on Fridays.

  • October 2, 2015 | 12:00 PM | LASR conference room
    Oscillations in the CMB bispectrum
    Moritz Munchmeyer, Institute d'Astrophysique Paris

    Oscillating signatures in the correlation functions of the primordial density perturbations are predicted by a variety of inflationary models. A theoretical mechanism that has attracted much attention is a periodic shift symmetry as implemented in axion monodromy inflation. This symmetry leads to resonance non-gaussianities, whose key feature are logarithmically stretched oscillations. Oscillations are also a generic consequence of excited states during inflation and of sharp features in the potential. Oscillating shapes are therefore a very interesting experimental target. After giving an overview of these motivations, I will discuss how to search for these signatures in the CMB. Fast oscillations are difficult to search for with traditional estimation techniques, and I will demonstrate how targeted expansions, that exploit the symmetry properties of the shapes, allow to circumvent these difficulties. As a member of the Planck collaboration, I will discuss the Planck results that have been obtained using these methods in the bispectrum, as well as a joint search using bispectrum and power spectrum. Due to their low overlap with other non-gaussian shapes, oscillating bispectrum shapes are not exhaustively constrained and a potential discovery is therefore not yet ruled out. My talk will be based in particular on arxiv:1412.3461, arxiv:1505.05882 and Planck publications on inflation and non-gaussianities.
  • October 16, 2015 | 12:00 PM | LASR conference room
    Healthy solutions in the decoupling limit of quasi-dilaton theory
    Rampei Kimura, New York University

    Quasidilaton massive gravity is an extension of massive General Relativity to a theory with additional scale invariance and approximate internal Galilean symmetry. In this talk, I will present a detailed study of the spherically symmetric solutions which are free of ghosts, tachyons, gradient instability, and superluminality for all propagating modes in a theory of quasidilaton.

 
Special seminars


 
Open group seminars

  • July 21, 2015 | 1:00 PM | LASR Conference Room
    Modeling and measuring CMB lensing in the cross-correlation era
    Giulio Fabbian, SISSA-Trieste

    Being less sensitive to systematic effects, the cross-correlations between Cosmic Microwave Background (CMB) data sets and large-scale structures surveys are expected to provide excellent astrophysical and cosmological constraints in the upcoming years. In order to capitalize on the advantages offered by these joint analysis techniques, an accurate physical modeling of both the observables involved is required. I will present recent numerical results on CMB lensing simulations aiming at including effects of non-linear evolution of large-scale structures beyond the Born approximation on large fraction of the sky. If time allows, I will also discuss the status of the POLARBEAR experiment and its upgrade, the Simons Array, which will provide one of the best CMB data set for cross-correlation studies.
  • August 6, 2015 | 2:00 PM | LASR Conference Room
    The invisible landscape - Weak lensing mass maps with the Dark Energy Survey and beyond
    Chihway Chang, ETH Zurich

    Our view of the Universe is distorted due to gravitational lensing. These distortions help us understand the content and history of the Universe. In this talk I will describe our recent work where we used the Dark Energy Survey Science Verification data to make a large weak lensing mass map of a slice of our Universe. I then discuss a variety of topics that can be investigated with these maps and in combination with other cosmological maps. As we look forward to the completion of current surveys and more ambitious future surveys coming online, these explorations would allow us to take a new look at the invisible landscape of our Universe.

 
Thursday lunch discussions
KICP's Thunch: KICP Cosmology Lunch (Thunch) Weekly on Thursdays, Noon, LASR conference room.

Please join us for an informal lunch discussion, led by KICP fellows, of recent news and papers in cosmology. Topics range from experiment and observations to theory in all areas of KICP science. To submit or view papers for this week's Thunch please visit the Thunch website.


 
Astronomy colloquia
Colloquia of the Department of Astronomy & Astrophysics: Unless otherwise noted, all talks are held in BSLC 115 at 3 PM on Wednesdays. A reception will be held in TAAC 71 following the talk.