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Computer Science/Discrete Mathematics Seminar I

April 30, 2026 | 11:00am - 12:00pm
Add to calendar 04/30/2026 11:0004/30/2026 12:00Computer Science/Discrete Mathematics Seminar Iuse-titleTopic: How to Amplify the Distance of a Code Optimally Speakers: Sidhanth Mohanty, Northwestern University More: https://www.ias.edu/math/events/computer-sciencediscrete-mathematics-seminar-i-625 We consider the problem of explicitly constructing binary linear codes achieving the optimal rate-distance tradeoff.  In 2017, Ta-Shma gave an almost-optimal construction in the low-rate regime, i.e., he gave a construction of binary linear codes with distance 1/2 - ε and rate ε^{2+o(1)}.  For comparison, random codes achieve distance 1/2 - ε at rate Ω(ε^2).  Ta-Shma's approach is based on starting with a good code, and amplifying its distance with the "expander walk" approach of Rozenman and Wigderson, but is fairly involved technically. In this talk, I will describe the expander walk amplification approach, along with a simpler route to obtain Ta-Shma's result using what we call "free expander walks". This talk is based on a recent joint work with Jun-Ting (Tim) Hsieh and Rachel Yun Zhang (https://arxiv.org/abs/2601.12606 [https://urldefense.com/v3/__https:/arxiv.org/abs/2601.12606__;!!NubF!LtFNi-qlD3XvsL_7UmeC_4scJRtMBxb4uo4WTFUxZbYubXGdgvgzXyOO4OaWnVaShlVfXL4AIfnASSnOJcN_4EJ79adbd0I$] Simonyi Classroom (S-114)a7a99c3d46944b65a08073518d638c23
Sidhanth Mohanty, Northwestern University

IAS Quantum Aspects of Black Holes Group Meeting

April 30, 2026 | 11:00am - 12:00pm
Add to calendar 04/30/2026 11:0004/30/2026 12:00IAS Quantum Aspects of Black Holes Group Meetinguse-titleTopic: Comments on the Sign Problem in BFSS Speakers: Henry Lin, Princeton University More: https://www.ias.edu/sns/events/ias-quantum-aspects-black-holes-group-meeting-68 ABSTRACT: The sign problem is an infamous obstacle for classically simulating quantum theories with fermions. I will propose an effective field theory method for analyzing the sign problem. At high temperatures, a d+1 dimensional field theory reduces to a d-dimensional theory; in the lower dimensional theory, one can identify the leading operator that gives the phase of the Pfaffian in the higher dimensional theory. We apply this to d=1 BFSS quantum mechanics, where the phase becomes an operator in a bosonic multi-matrix integral. Our results suggest that there is a sign problem in BFSS at strong coupling/in the gravity regime. Based on work in progress with Gauri Batra and Haifeng Tang.   Bloomberg Hall Physics Librarya7a99c3d46944b65a08073518d638c23
Henry Lin, Princeton University
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Chris Hamilton

United States

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Cosmic Calorimetry

Juna Kollmeier

The detailed use of the Lyman-alpha forest as a cosmic calorimeter will certainly reveal information about the balance of ionizing photons coming from stars and quasars, and perhaps something entirely new about our universe that we have not anticipated.

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Freeman J. Dyson, Scientist and Writer Who Dreamt Among the Stars, Dies at 96

Freeman Dyson, theoretical physicist and writer who embraced the stunning diversity of the universe with unique spirit, died on February 28, 2020, at the age of 96. Dyson generated revolutionary scientific insights, including calculations bridging the quantum and human worlds and contributions to nuclear engineering, solid-state physics, ferromagnetism, astrophysics, biology, and applied mathematics. “No life is more entangled with the Institute and impossible to capture,” said Robbert Dijkgraaf, IAS Director and Leon Levy Professor. “His secret was simply saying ‘yes’ to everything in life, till the very end.”

Futuristic graphic from the 2022 Women and Math Poster with text that reads May 21-27, 2022

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A Community of Scholars: Impressions of the Institute for Advanced Study

An illustrated anthology celebrating eighty years of history and intellectual inquiry at the Institute for Advanced Study.

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SgrA
Astronomers have unveiled the first image of the supermassive black hole at the center of our own Milky Way galaxy.

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