Events Daily

Monday, July 24, 2023

Updates to the Maunakea Spectroscopic Explorer: Thousands of Fibers, Infinite Possibilities
Andy Sheinis for the MSE Team, Canada-France-Hawaii Telescope
Event Type: Astro Seminar
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 902, Lg Conf
Abstract: MSE is a massively multiplexed spectroscopic survey facility that will replace the Canada-France-Hawaii-Telescope in the coming decade. This 12-m plus telescope, with its 1.5-2.0 square degree field-of-view, will observe 18,000 astronomical targets in every pointing from 360 nm through H-band at low/moderate resolution (R=3,000/7,000) and high (R=30,000). A fiber positioner will allow the system to position individual fibers in parallel to enable simultaneous full-field coverage for both resolution modes. MSE will unveil the composition and dynamics of the faint Universe and impact nearly every field of astrophysics across all spatial scales, from individual stars to the largest scale structures in the Universe, including (i) the ultimate Gaia follow-up facility for understanding the chemistry and dynamics of the distant Milky Way, including the outer disk and faint stellar halo at high spectral resolution (ii) galaxy formation and evolution at cosmic noon, (iii) derivation of the mass of the neutrino and insights into inflationary physics through a cosmological redshift survey that probes a large volume of the Universe with a high galaxy density. The instrument suite, dedicated to large-scale surveys, will enable MSE to collect a massive amount of data: equivalent to a full SDSS Legacy Survey every several weeks. We present an update on the major systems development for MSE along with the ongoing process of evaluating improvements to the baseline telescope design. In addition, we present the plan to develop a Pathfinder instrument at CFHT to fast-track the development of the MSE technology.

Intro to Conformal bootstrap
Shai Chester, Harvard University
Event Type: Special Seminar
Time: 1:30 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: These lectures are intended to familiarize the audience with the nuts and bolts of the numerical bootstrap as efficiently as possible. After a brief review of the basics of conformal field theory in d > 2 spacetime dimensions, we discuss how to compute conformal blocks, formulate the crossing equations as a semi-definite programming problem, solve this problem using SDPB on a personal computer, and interpret the results. We will discuss worked examples for all steps, including bounds for the 3d CFTs with Z2 or O(N) global symmetries. Each lecture will include a problem set, which culminate in a precise computation of the 3d Ising model critical exponents using the mixed correlator Z2 bootstrap. We will also provide a Mathematica wrapper and Docker software. We will conclude with a broad survey of the conformal bootstrap, and future directions.

Link to the Event Video