10/9/2019 Fluid Dynamics Seminar
2019-10-09 15:00 - 16:00 (America/New_York)

10/9/2019 RM & PT Seminar
2019-10-09 15:15 - 16:15

Global Existence and Scattering for Einstein's equations and related equations satisfying the weak null condition
2019-10-09 16:30 - 17:30
Speaker: Hans Lindblad (Johns Hopkins University)
Title: Global Existence and Scattering for Einstein’s equations and related equations satisfying the weak null condition
Abstract: Einstein’s equations in harmonic or wave coordinates are a system of nonlinear wave equations for a Lorentzian metric, that in addition satisfy the preserved wave coordinate condition. Christodoulou-Klainerman proved global existence for Einstein vacuum equations for small asymptotically flat initial data. Their proof avoids using coordinates since it was believed the metric in harmonic coordinates would blow up for large times. John had noticed that solutions to some nonlinear wave equations blow up for small data, whereas Klainerman came up with the ‘null condition’, that guaranteed global existence for small data. However Einstein’s equations do not satisfy the null condition. Hormander introduced a simplified asymptotic system by neglecting angular derivatives which we expect decay faster due to the rotational invariance, and used it to study blowup. I showed that the asymptotic system corresponding to the quasilinear part of Einstein’s equations does not blow up and gave an example of a nonlinear equation of this form that has global solutions even though it does not satisfy the null condition. Together with Rodnianski we introduced the ‘weak null condition’ requiring that the corresponding asymptotic system have global solutions and we showed that Einstein’s equations in wave coordinates satisfy the weak null condition and we proved global existence for this system. Our method reduced the proof to a fraction and has now been used to prove global existence also with matter fields.
Recently I derived precise asymptotics for the metric which involves logarithmic corrections to the radiation field of solutions of linear wave equations. We are further imposing these asymptotics at infinity and solve the equations backwards to obtain global solutions with given data at infinity.

10/10/2019 Condensed Matter Seminar
2019-10-10 11:50 - 13:00

10/10/2019 Spacetime Seminar
2019-10-10 15:30

10/11/2019 General Relativity Seminar
2019-10-11 10:30 - 11:30

10/15/2019 Spacetime Seminar
2019-10-15 15:30 - 17:00

10/16/2019 Quantum Matter Seminar
2019-10-16 10:30 - 12:00

Noncommutative Analysis, Computational Complexity, and Quantum Information
2019-10-16 12:19 - 2019-10-18 12:19 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
On October 16-18, 2019 the CMSA hosted a workshop on Noncommutative Analysis, Computational Complexity, and Quantum Information.
This workshop focuses on linking three different rapidly developing areas: noncommutative real algebraic geometry (RAG), theory of computation and quantum information theory. This mix of overlapping but independently developing topics should lead to a stimulating flow of tools and important problems into several disciplines. Given the different communities there will be an emphasis on tutorials and making the lectures broadly understandable.
The workshop was held in room G10 of the CMSA, located at 20 Garden Street, Cambridge, MA.
Organizers: Boaz Barak, Bill Helton, Pablo Parrilo, & Tselil Schramm.
Speakers:

Jason Altschuler, MIT | Video
Boaz Barak, Harvard | Video
Ankit Garg, Microsoft Research | Slides | Video
David Gosset, University of Waterloo | Video
Aram Harrow, MIT | Video
Igor Klep, University of Ljubljana
Salma Kuhlmann, Universität Konstanz | Video
Scott McCullough, University of Florida | Slides
Ion Nechita, Laboratoire de Physique Théorique | Slides | Video
Rafael Oliveira, University of Toronto | Video
Vern Paulsen, University of Waterloo | Video
Suvrit Sra, MIT | Video
Victor Vinnikov, Ben Gurion University | Video
Jurij Volčič, Texas A&M University | Slides | Video
Adam Bene Watts, MIT

10/16/2019 RM & PT Seminar
2019-10-16 15:15

Monogamy of entanglement and convex geometry
2019-10-16 16:00 - 17:00 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
Speaker: Aram Harrow (MIT)

Title: Monogamy of entanglement and convex geometry
Abstract: The SoS (sum of squares) hierarchy is a flexible algorithm that can be used to optimize polynomials and to test whether a quantum state is entangled or separable. (Remarkably, these two problems are nearly isomorphic.) These questions lie at the boundary of P, NP and the unique games conjecture, but it is in general open how well the SoS algorithm performs. I will discuss how ideas from quantum information (the “monogamy” property of entanglement) can be used to understand this algorithm. Then I will describe an alternate algorithm that relies on apparently different tools from convex geometry that achieves similar performance. This is an example of a series of remarkable parallels between SoS algorithms and simpler algorithms that exhaustively search over carefully chosen sets. Finally, I will describe known limitations on SoS algorithms for these problems.

10/18/2019 General Relativity
2019-10-18 10:30 - 23:30

10/18/2019 Spacetime Seminar
2019-10-18 14:30 - 15:00

Compactification for cluster varieties without frozen variables of finite type
2019-10-21 12:10 - 13:10
Speaker: Man-Wai Cheung
Title: Compactification for cluster varieties without frozen variables of finite type
Abstract: Cluster varieties are blow up of toric varieties. They come in pairs $(A,X)$, with $A$ and $X$ built from dual tori. Compactifications of $A$, studied by Gross, Hacking, Keel, and Kontsevich, generalize the polytope construction of toric varieties while the compactifications of X, studied by Fock and Goncharov, generalize the fan construction. The conjecture is that the $A$ and the $X$ cluster varieties are mirrors to each other. Together with Tim Magee, we have shown that there exists a positive polytope for the type $A$ cluster varieties which give us a hint to the Batyrev–Borisov construction.

2019 Ding Shum Lecture
2019-10-22 12:11 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
On October 22, 2019, the CMSA held the third annual Ding Shum lecture.
Speaker: Ronald L. Rivest (MIT)
Title: Election Security
Ronald L. Rivest is an Institute Professor at the Massachusetts Institute of Technology. He is a member of the Electrical Engineering and Computer Science Department and the Computer Science and Artificial Intelligence Laboratory (CSAIL) and a founder of the Cryptography and Information Security research group within CSAIL. His research has been in the areas of algorithms, machine learning, cryptography, and election security, for which he has received multiple awards, including: the ACM Turing Award (with Adleman and Shamir), the BBVA Frontiers of Knowledge Award, National Inventor’s Hall of Fame membership, and the Marconi Prize.
Prof. Rivest is also well-known as a co-author of the textbook “Introduction to Algorithms” (with Cormen, Leiserson, and Stein), and as a co-inventor of the RSA public-key cryptosystem (with Adleman and Shamir). He is a co-founder of RSA and of Verisign.He has served on the Technical Guidelines Development Committee (advisory to the Election Assistance Commission), in charge of the Security subcommittee. He is a member of the CalTech/MIT Voting Technology Project, on the Board of Verified Voting, and an advisor to the Electronic Privacy Information Center. Additionally, he has served on the Technical Guidelines Development Committee (advisory to the Election Assistance Commission), as a member of the CalTech/MIT Voting Technology Project, and as an advisor to the Electronic Privacy Information Center.

Last year featured Eric Maskin, who spoke on “How to Improve Presidential Elections: the Mathematics of Voting.” The first Ding Shum lecture took place on October 10, 2017, featuring Leslie Valiant on “Learning as a Theory of Everything.”
This event is made possible by the generous funding of Ding Lei and Harry Shum.

10/23/2019 Quantum Field Theory Seminar
2019-10-23 11:30 - 12:00

10/23/2019 Fluid Dynamics Seminar
2019-10-23 15:00 - 16:00

10/23/2019 RMPT Seminar
2019-10-23 15:15 - 16:15

10/24/2019 Quantum Matter Seminar
2019-10-24 11:50 - 13:00

General Relativity Seminar
2019-10-25 10:30 - 11:30

Spacetime and Quantum Mechanics Master Class Workshop
2019-10-28 09:00 - 2019-10-30 17:00 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
As part of the program on Spacetime and Quantum Mechanics, Total Positivity and Motives, the CMSA will host a “Master Class Workshop” on October 28-30, 2019. Each day of the workshop will feature an intensive full day of pedagogical lectures, with the aim of bringing actively interested but non-expert physicists and mathematicians up to speed on the featured topics.
Everyone is welcome to attend the lectures.
The master class workshop will be held in room G10 of the CMSA, located at 20 Garden Street, Cambridge, MA.
Organizers:

Nima Arkani-Hamed (IAS)
Lauren Williams (Harvard)
Alex Postnikov (MIT)
Thomas Lam (Michigan)

Here is a partial list of the mathematicians and physicists who have indicated that they will attend part or all of this special program as a visitor:

Paolo Benincasa, 11/17/2019 – 11/29/2019
Jacob Bourjaily, 9/1/2019 – 12/15/2019
Francis Brown, 9/15/2019 – 9/20/2019
Simon Caron-Huot, 9/30/2019 – 10/04/2019
Lance Dixon, 9/9/2019 – 9/20/2019
Charles Doran, 10/19/2019 – 11/1/2019
James Drummond, 10/14/2019 – 10/18/2019
Nick Early, 11/18/2019 – 11/22/2019
Livia Ferro, 10/27/2019 – 11/9/2019
Sergey Fomin, 10/6/2019 – 10/16/2019
Sebastian Franco, 10/9/2019 – 10/19/2019
Hadleigh Frost, 9/15/2019 – 12/20/2019
Michael Green, 10/05/2019 – 10/13/2019
Alexander Goncharov, 12/05/2019 – 12/20/2019
Song He, 9/29/2019 – 11/10/2019
Xuhua He, 10/30/2019-11/03/2019.
Enrico Herrmann, 10/27/2019 – 11/9/2019
Yutin Huang, 9/30/2019 – 10/12/2019
Steven Karp, 10/11/2019 – 11/03/2019
Tomasz Lukowski, 10/27/2019 – 11/11/2019
Andrew McLeod, 10/6/2019 – 10/19/2019 & 11/3/2019 – 11/16/2019
Sebastian Mizera, 10/28/2019 – 11/1/2019
Erik Panzer, 9/15/2019 – 9/25/2019
Matteo Parisi, 10/26/2019 – 11/10/2019
Julio Parra-Martinez, 10/10/2019 – 05/12/2019
Pierpaolo Mastrolia, 11/8/2019 – 11/16/2019
Pasha Pylyavskyy, 9/8/2019 – 9/22/2019 & 10/14/2019 – 11/1/2019
Junjie Rao, 10/25/2019 – 11/04/2019
Giulio Salvatori, 9/3/2019 – 12/15/2019
Michael Shapiro, 10/27/2019 – 11/2/2019
David Speyer, 10/14/2019 – 10/18/2019
Hugh Thomas, 10/27/2019 – 11/22/2019
Jaroslav Trnka, 9/30/2019 – 10/04/2019, 10/28/2019 – 11/01/2019, 11/18/2019 – 11/22/2019
Cristian Vergu, 11/10/2019 – 11/30/2019
Matthias Volk, 10/14/2019 – 10/25/2019
Matthew von Hippel, 11/11/2019 – 11/22/2019
Pierre Vanhove, 10/22/2019 – 10/31/2019
Matthias Wilhelm, 10/14/2019 – 10/25/2019

10/28/2019 Math Physics
2019-10-28 12:00 - 13:00

10/30/2019 Quantum Matter Seminar
2019-10-30 10:30 - 12:00

10/30/2019 Random Matrix and Probability Theory Seminar
2019-10-30 15:15 - 16:15

Spacetime, Quantum Mechanics and Positive Geometry at Infinity
2019-10-30 16:30 - 17:30 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
Speaker: Nima Arkani-Hamed (IAS)

Title: Spacetime, Quantum Mechanics and Positive Geometry at Infinity

10/31/2019 Condensed Matter Seminar
2019-10-31 11:50 - 13:00

11/31/2019 Spacetime Seminar
2019-10-31 14:30 - 16:00

Learning from health data in the million genome era
2019-11-01 09:00 - 17:00 | CMSA, 20 Garden Street, Cambridge, MA, 02138, United States
On November 1, 2019 the CMSA will be hosting a conference organized by Seven Bridges Genomics. The workshop will be held in room G10 of the CMSA, located at 20 Garden Street, Cambridge, MA.
Projects currently underway around the world are collecting detailed health and genomic data from millions of volunteers. In parallel, numerous healthcare systems have announced commitments to integrate genomic data into the standard of care for select patients. These data have the potential to reveal transformative insights into health and disease. However, to realize this promise, novel approaches are required across the full life cycle of data analysis. This symposium will include discussion of advanced statistical and algorithmic approaches to draw insights from petabyte scale genomic and health data; success stories to date; and a view towards the future of clinical integration of genomics in the learning health system.
Speakers:

Heidi Rehm, Ph.D.
Chief Genomics Officer, MGH; Professor of Pathology, MGH, BWH & Harvard Medical School; Medical Director, Broad Institute Clinical Research Sequencing Platform.
Saiju Pyarajan, Ph.D.
Director, Centre for Data and Computational Sciences,VABHS, and Department of Medicine, BWH and HMS
Tianxi Cai, Sci.D
John Rock Professor of Population and Translational Data Sciences, Department of Biostatistics, Harvard School of Public Health
Susan Redline, M.D., M.P.H
Farrell Professor of Sleep MedicineHarvard Medical School, Brigham and Women’s Hospital and Beth Israel Deaconess Medical Center
Avinash Sahu, Ph.D.
Postdoctoral Research Fellow, Dana Farber Cancer Institute, Harvard School of Public Health
Peter J. Park, Ph.D.
Professor of Biomedical Informatics, Department of Biomedical Informatics, Harvard Medical School
David Roberson
Community Engagement Manager, Seven Bridges

11/1/2019 General Relativity Seminar
2019-11-01 10:30 - 11:30

11/4/2019 Mathematical Physics Seminar
2019-11-04 12:00 - 13:00
