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Events & Talks
Current & Future Events
Workshop: Near-Field Cosmology with the Dark Energy Survey's DR1 and Beyond
Stars in our Milky Way and galaxies in our Local Group contain the fossils and clues on stellar evolution and supernovae, the formation and evolution of star clusters and dwarf galaxies, and the formation of large spiral galaxies. Rapid progress in this field -- usually called Galactic Archeology -- was enabled by large-area imaging and spectroscopic surveys of old stellar components of the Milky Way and dwarf galaxies, together with simulations of chemical and dynamical evolution. The field of Near-Field Cosmology extends the scope of these studies to probe the formation and evolution of galaxies and the nature of dark matter.
The Dark Energy Survey (DES) is releasing its DR1, with catalogs and images from the first three years of DES operations early in 2018, including 400M objects (100M stellar sources in grizY band to r of 24th magnitude at 10 sigma) over 5000 square degrees mostly in the Southern Galactic cap. This survey is about 2 magnitudes fainter than SDSS at the same S/N. In addition to DES, many other DECam community surveys, such as DECaLS, DECaPS, SMASH, MagLiteS, BLISS, etc, have already had or will soon have the public data release.
Kavli Institute for Cosmological Physics (KICP) at the University of Chicago will host a 3-day workshop on June 27-29 to explore uses of the DES DR1 for near field cosmology studies in conjunction with other DECam public data. Furthermore, the workshop will explore possible synergies with other spectroscopic surveys as well as Gaia DR2.
The 3-day workshop will include presentations and discussion on the first two days and a hack day on the last day. Talks on ideas or science results related to DES/DECam data, or synergies with other programs are encouraged. Abstracts can be submitted at registration. On the hack day, we will hack on DES DR1 data and associated data sets (like Gaia DR2) in a collaborative format. Specific hack topics can be submitted at registration.
Topics in this workshop includes:
Workshop: Joint SPT-DES Analysis
The Kavli Institute of Cosmological Physics (KICP) at the University of Chicago is hosting the "SPTxDES Joint Analysis" workshop, which will be held from 20th to 22nd June 2018 in the Eckhardt Research Center (ERC) on the University of Chicago campus.
This workshop focuses on the science at the intersection of two leading cosmology experiments---the Dark Energy Survey (DES) and the South Pole Telescope (SPT) - with the goal of optimal extraction of cosmological constraints from these two surveys.
The workshop would serve as both a forum for discussions on current analyses as well as an incubator for future ideas. The meeting will cover two main themes: galaxy clusters and wide-field science. While these topics cover a broad spectrum, we will target the workshop such that it accelerates joint work on these key areas of synergy between the two collaborations.Learn more >>
Workshop: Towards Dark Matter Discovery
The Kavli Institute of Cosmological Physics (KICP) at the University of Chicago is hosting the "Towards Dark Matter Discovery" workshop, which will be held from 11th to 13th April 2018 in the Eckhardt Research Center (ERC) on the University of Chicago campus.
The workshop will explore new directions on the path toward discovering the nature of dark matter. The invited speakers are encouraged to share their expertise in the fields of primordial black holes, thermal relic dark matter, nonthermal relic dark matter, ultralight dark matter, superheavy dark matter, kinda-chubby dark matter, new strategies for direct detection, newer strategies for direct detection, avant-garde strategies for direct detection, and axions. During the three day workshop, we will host approximately 20 talks of 30 minutes each with generous time remaining for discussion.
Visitors to the University of Chicago are invited to spend the entire week at the university.Learn more >>
Winter 2018 Postdocs Symposium
Fall 2017 Postdocs Symposium
Public Lectures & Open Discussion: Gravitational Waves & Transient Astronomy
Everything You Always Wanted to Know About Gravitational Waves & Transient Astronomy but were Too Afraid to Ask...
Special KICP/EFI/Physics/A&A Colloquium and Reception
The colloquium will be followed by discussion and comments by: Holz, Frieman, Hubble Fellow Dan Scolnic, University Professor Wendy Freedman, and students and postdocs involved in the new findings.
Livestream of LIGO press conference will be shown in ERC Lobby (Video Wall) and PRC 201, 9:00-11:00 a.m.
The purpose of the Jamboree is to allow all of KICP members who are currently conducting research to briefly introduce themselves and their work to the entire KICP community. This includes all Senior Members, Senior Researchers, Fellows, and Associate Fellows. Because we have a lot of members and limited time, the jamboree will take the following, tightly controlled, format:
Summer School: CMB Detectors and Instrumentation
This 1-week "hands-on" summer school is designed to provide the participants with working knowledge of the detectors and instrumentation used to detect the tiny temperature and polarization anisotropy of the cosmic microwave background (CMB). Early graduate students interested in pursuing a PhD in experimental CMB research methods are particularly encouraged to apply. A feature of the school is hands-on activities to teach students the basics of CMB instrumentation. We expect to have room for approximately 15 students.
Topics will include: superconducting detectors, e.g., transition-edge-sensor (TES) bolometers, kinetic-inductance-detectors (KIDs); detector characterization (responsivity, beams, bands, time constants, polarization calibration); coherent techniques for characterizing mm-wave components; SQUIDs and detector readout; antenna design; and Fourier transform spectroscopy.
The School will be held at the Kavli Institute for Cosmological Physics (KICP) at the University of Chicago in the William Eckhardt Research Center (ERC).Learn more >>
Midweek on the Midway: Escape from planet Earth
Compare the movie's hero astronaut, Scorch Supernova, to critters walking our planet. See yourself as a South Pole explorer in our selfie booth. Pre-movie fun provided by UChicago's Department of Astronomy and Astrophysics, the Kavli Institute for Cosmological Physics, and Boy Scout Troop 599.
The Physics of Toys, Yerkes Summer Institute
Instructors: Huanqing Chen, Zoheyr Doctor, Clarke Esmerian, Emily Gilbert, Jason Henning, Gourav Khullar, Randy Landsberg, James Lasker, Phil Mansfield, Nora Shipp.
Over the course of a week, local Chicago high school students will learn about how the physics of energy conservation makes various everyday toys possible, and how using a structured engineering design process can allow them to understand the inner workings of things around them. In the three main labs, students will learn about pressure potential energy by reverse engineer super soakers and testing manufacturer claims about bottle rockets, they will learn about elastic potential energy by building and racing wind up cars, and they will learn about gravitational potential energy as they compete to build room-sized Rube Goldberg machines. The Institute will also contain various bite-sized activities, ranging from observing nebulae with the Yerkes 24-inch telescope, to learning defense techniques against deceptive infographics, to investigating the mysterious physics of the household microwave.
Alessandro Manzotti, "Unveiling the early Universe: delensing the Cosmic Microwave Background with galaxy surveys"
Ph.D. Committee members: Scott Dodelson (Ph.D. advisor), Wayne Hu, Richard G. Kron, Abigail G. Vieregg
"Alessandro led the team that carried out the first 'de-lensing' of the polarization in the cosmic microwave background. Using data from the South Pole Telescope, the team used software to undo what billions of years of propagation through the clumpy universe has done: distorted the pattern of polarization. This first demonstration is the harbinger of what will ultimately become an essential tool in analyses of future SPT CMB-Stage 4 data."
- Scott Dodelson, Ph.D. advisor
Laura M Mocanu, "Measuring the cosmic microwave background gravitational lensing potential and its power spectrum with SPTpol"
Ph.D. Committee members: Scott Dodelson, Brad Benson, Abigail Vieregg.
"Monica has make many important contributions to the analysis of South Pole Telescope CMB data. For her thesis she has used SPTpol temperature and polarization data to produce the most sensitive CMB lensing reconstruction of the mass distribution in the universe, paving the wave for SPT-BICEP B-mode delensing and other cosmological analysis."
- John Carlstrom, Ph.D. advisor
Thesis Abstract: Weak gravitational lensing by large-scale structure in the universe causes deflections in the paths of cosmic microwave background (CMB) photons. This effect introduces non-Gaussian correlations in the observed CMB temperature and polarization fields. The signature of lensing can be used to reconstruct the projected gravitational lensing potential with a quadratic estimator technique; this provides a measure of the integrated mass distribution out to the surface of last scattering. The power spectrum of the lensing potential encodes information about the geometry of the universe and the growth of structure and can be used to place constraints on the sum of neutrino masses and dark energy. High signal-to-noise mass maps from CMB lensing are also powerful for cross-correlating with other tracers of large-scale structure and for delensing the CMB in search for primordial gravitational waves. In my thesis, I describe a measurement of the CMB gravitational lensing potential and its power spectrum using data from 500 square degrees of sky observed with the polarization-sensitive receiver installed on the South Pole Telescope, SPTpol.
Michael Turner, "The origin of our universe: what we know for sure and the big mysteries"
Speaker: Michael S. Turner
Professor, Departments of Astronomy and Astrophysics, Physics; Enrico Fermi Institute; University of Chicago
We can trace the evolution of our Universe back 13.8 Billion years, to within a microsecond of a big bang beginning. At that early time, all that we see today existed as a hot, slightly lumpy quark soup. We are trying to answer even bigger questions today, e.g., the nature of the dark matter and dark energy that steer the evolution of the Universe, and extend our understanding even further back, even addressing what happened before the big bang.
Chen He Heinrich, "Lensing Bias to CMB Polarization Measurements of Compensated Isocurvature Perturbations"
Ph.D. Committee members: Daniel Holz, Abigail Vieregg, Liantao Wang.
Thesis Abstract: Compensated isocurvature perturbations (CIPs) are opposite spatial fluctuations in the baryon and dark matter (DM) densities. They arise in the curvaton model and some models of baryogenesis. While the gravitational effects of baryon fluctuations are compensated by those of DM, leaving no observable impacts on the cosmic microwave background (CMB) at first order, the baryon fluctuations correlate CMB anisotropies at different multipoles. As a result, CIPs can be reconstructed using quadratic estimators similarly to CMB detection of gravitational lensing. Because of these similarities, however, the CIP estimators are biased with lensing contributions that must be subtracted. In this work, we evaluate these lensing contributions and their impact on the CIP detection threshold due to lensing noise, and assess the prospect of detecting the maximal CIP signal in the curvaton model for a cosmic-variance-limited (CVL) temperature and polarization experiment.
Hsin-Yu Chen, "Multi-messenger Astronomy with Advanced LIGO-Virgo"
"Hsin-Yu's work is helping set the stage for the new era of gravitational-wave astronomy. She has played an active role within the LIGO collaboration in the analysis of our first detections, while also becoming a leader in the field of multi-messenger astronomy."
- Daniel E. Holz, PhD advisor
Thesis Abstract: My thesis is focused on gravitational wave multi-messenger astronomy. The most promising sources for current gravitational wave detectors are compact binary mergers, including the mergers of stellar mass binary black holes, binary neutron stars, and neutron star-black hole system. I investigated the detection rate of binary neutron star and neutron star-black hole mergers from observations of their potential electromagnetic emission. To facilitate the search for the electromagnetic counterparts and the host galaxies of compact binaries, I developed a rapid algorithm that reconstructs the sky direction and luminosity distance of binary mergers from their gravitational wave signals, and predicted the existence of well-localized events. In addition, I carried out a thorough study of how gravitational-wave observational selection effects influence electromagnetic follow-up.
In summary, I explored how to measure astrophysical and cosmological parameters with gravitational wave detections, and facilitated gravitational wave-electromagnetic follow-up through various approaches, paving the way for the future of gravitational wave astrophysics and cosmology.
DES Collaboration Meeting
The Dark Energy Survey is a collaboration of 400 scientists from 25 institutions in 7 countries using the Dark Energy Camera on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory to carry out a 5-year multi-band imaging survey to probe the nature of dark energy and the physics of cosmic acceleration. Our Spring 2017 collaboration meeting will take place at the Kavli Institute for Cosmological Physics (KICP), in the Eckhart Research Center at the University of Chicago.Learn more >>
Michael Fedderke, "Studies in Higgs physics, particle dark matter and early universe"
"Michael's thesis work covers several important aspects of particle physics and cosmology. It includes detailed studies on the signal of dark matter annihilation in the galactic halo. After producing an interesting paper on the heavy particle production in the early universe, he delved into Higgs physics. He evaluated the potential of discovering new physics via fermionic Higgs portal, which has implications for the physics reach of both current and future colliders. In his most recent project, he has also constructed a model which addressed the little hierarchy problem in the composite Higgs scenario using cosmological evolution of an axion like field."
- LianTao Wang, PhD advisor
Dr. Thomas Zurbuchen, NASA Associate Administrator for the Science Mission Directorate, "NASA Science Missions"
NASA Associate Administrator for the Science Mission Directorate Dr. Thomas Zurbuchen will be visiting next Wednesday May 31. He will be giving a short presentation about NASA Space Science and answering questions about NASA and its science program. This is a wonderful opportunity to hear directly from the individual who directs NASA's Science program, as well as asking questions and expressing your views.
He is especially interested in meeting and hear from graduate students and postdocs.
Spring 2017 Postdocs Symposium
Computations in Science Seminar: Daniel Scolnic, "Measuring the size of the Universe with Standard Candles"
Astrophysicists use standard candles, objects which have roughly the same luminosity, to infer distances to far-away parts of the universe. Standard candles of variable stars called 'cepheids' were used to discover the expanding universe, and standard candles of exploding stars called 'supernovae' were used to discover the accelerating universe. Together, these two standard candles can be used to measure the size of the universe. Interestingly, this measurement of the size of the universe recovered conflicts with measurements of the size of the universe from extrapolations of data from the Cosmic Microwave Background. I will go over how we make our measurement, from soup to nuts, and discuss how we can be confident in the accuracy of our values. I will then discuss different ways too explain the tension we see in the different sets of measurements, and possible new physics that may be on the horizon.
French-American Science Festival 2017
Cosmin Deaconu, Postdoctoral Researcher - Kavli Institute for Cosmological Physics, University of Chicago
Eric Oberla, Postdoctoral Researcher - Kavli Institute for Cosmological Physics, University of Chicago
Sam Passaglia, Graduate Student - Kavli Institute for Cosmological Physics, University of Chicago
The Kavli Institute for Cosmological Physics (KICP) at the University of Chicago focuses on understanding the nature of the universe. Scientists at the University of Chicago use many different methods to learn about our universe. Come take a look at our cosmic ray detector, which can sense particles from outer space. Learn how we discover planets around other suns and about cosmology and particle astrophysics research performed by KICP in Antarctica, and the expansion of the universe. Feel free to ask us any questions you might have about the universe.