There are no events at the Simons Center today. Here are the events for this week
Wednesday, November 19th, 2025
YITP Event: James Gurian - Perimeter Institute
Time: 11:00 AM - 12:00 PM
Location:
Title: Core Collapse Beyond the Fluid Approximation
Title: Core Collapse Beyond the Fluid Approximation
Abstract: If the dark matter has a sufficiently large elastic self-interaction, energy transported by scatterings can lead to gravitational collapse in the core of dark matter halos. Quantitatively following the collapse (in principle) requires solving the 6-dimensional collisional Boltzmann equation, a formidable challenge. Here, I present the code KiSS-SIDM (Kinetic, Spherically Symmetric Self-Interacting Dark Matter), which handles the collision term via the Direct Simulation Monte Carlo algorithm, and simplifies the dynamics by assuming spherical symmetry. The efficiency of the code enables exploration of parameter space on a laptop. Yet, in contrast to the commonly adopted "conducting fluid" model, the code requires no calibration parameters. Further, the high accuracy of the code enables simulating deeper into the collapse than traditional N-body methods. In this regime, we find that non-equilibrium effects alter the evolution compared to the predictions of the fluid model.
Program Talk: Masamichi Miyaji
Time: 11:15 AM - 12:15 PM
Location: 313
Title: Non-perturbative bulk Hilbert space for JT gravity
Title: Non-perturbative bulk Hilbert space for JT gravity
Physics Seminar: Minjae Choi
Time: 2:00 PM - 3:00 PM
Location: 313
Title: Bootstrapping the physics at finite temperature
Abstract: Physical systems at finite temperature present a rich array of intriguing questions. However, studying their physical observables is not always straightforward, as it a priori requires tracing over the entire state space. In this talk, we explore how the bootstrap approach of imposing consistency conditions provides a powerful framework for studying finite temperature observables in both classical and quantum mechanical systems. We focus on two prototypical examples to illustrate this idea: the statistical Ising model on the lattice and large N matrix quantum mechanics. For the latter, we discuss bootstrap results for both one-point and two-point correlators.
Title: Bootstrapping the physics at finite temperature
Abstract: Physical systems at finite temperature present a rich array of intriguing questions. However, studying their physical observables is not always straightforward, as it a priori requires tracing over the entire state space. In this talk, we explore how the bootstrap approach of imposing consistency conditions provides a powerful framework for studying finite temperature observables in both classical and quantum mechanical systems. We focus on two prototypical examples to illustrate this idea: the statistical Ising model on the lattice and large N matrix quantum mechanics. For the latter, we discuss bootstrap results for both one-point and two-point correlators.
YITP Event: Professor Xiangyi Meng (Rensselaer Polytechnic Institute)
Time: 3:30 PM - 4:30 PM
Location:
Title: Distinct statistical characteristics of quantum communication networks
Abstract: Network science emerged around the year 2000, two decades after the birth of the Internet. As a result, much of its focus has been on explaining (rather than designing) the statistical and structural properties, such as scale-freeness and small-world behavior, of existing real-world networks. However, with the quantum Internet still in its early stages, the question arises: can network science actively contribute to the design of large-scale quantum communication networks? In this talk, I will explore how large-scale quantum communication networks can differ fundamentally from their classical counterparts, especially when incorporating various quantum elements like quantum memories, entanglement routing paradigms, and the intricate challenge of multipartite entanglement. These components have the potential to enhance quantum networks not just at the point-to-point level, but at the synergistic, network-wide scale, revealing novel statistical characteristics. This may open the door to a comprehensive, globally integrated (re)design of quantum communication systems—potentially guided by the principles of network science. 1. Hu, X. et al. Unveiling the importance of nonshortest paths in quantum networks. Sci. Adv. 11, eadt2404 (2025). 2. Meng, X., Hao, B., Ráth, B. & Kovács, I. A. Path Percolation in Quantum Communication Networks. Phys. Rev. Lett. 134, 030803 (2025).
Title: Distinct statistical characteristics of quantum communication networks
Abstract: Network science emerged around the year 2000, two decades after the birth of the Internet. As a result, much of its focus has been on explaining (rather than designing) the statistical and structural properties, such as scale-freeness and small-world behavior, of existing real-world networks. However, with the quantum Internet still in its early stages, the question arises: can network science actively contribute to the design of large-scale quantum communication networks? In this talk, I will explore how large-scale quantum communication networks can differ fundamentally from their classical counterparts, especially when incorporating various quantum elements like quantum memories, entanglement routing paradigms, and the intricate challenge of multipartite entanglement. These components have the potential to enhance quantum networks not just at the point-to-point level, but at the synergistic, network-wide scale, revealing novel statistical characteristics. This may open the door to a comprehensive, globally integrated (re)design of quantum communication systems—potentially guided by the principles of network science. 1. Hu, X. et al. Unveiling the importance of nonshortest paths in quantum networks. Sci. Adv. 11, eadt2404 (2025). 2. Meng, X., Hao, B., Ráth, B. & Kovács, I. A. Path Percolation in Quantum Communication Networks. Phys. Rev. Lett. 134, 030803 (2025).
YITP Event: Special seminar---Xiangyi Meng (Rensselaer Polytechnic Institute)
Time: 3:30 PM - 4:30 PM
Location: YITP Common Room (Math 6-125)
Title: Distinct statistical characteristics of quantum communication networks
Abstract: Network science emerged around the year 2000, two decades after the birth of the Internet. As a result, much of its focus has been on explaining (rather than designing) the statistical and structural properties, such as scale-freeness and small-world behavior, of existing real-world networks. However, with the quantum Internet still in its early stages, the question arises: can network science actively contribute to the design of large-scale quantum communication networks? In this talk, I will explore how large-scale quantum communication networks can differ fundamentally from their classical counterparts, especially when incorporating various quantum elements like quantum memories, entanglement routing paradigms, and the intricate challenge of multipartite entanglement. These components have the potential to enhance quantum networks not just at the point-to-point level, but at the synergistic, network-wide scale, revealing novel statistical characteristics. This may open the door to a comprehensive, globally integrated (re)design of quantum communication systems—potentially guided by the principles of network science. 1. Hu, X. et al. Unveiling the importance of nonshortest paths in quantum networks. Sci. Adv. 11, eadt2404 (2025). 2. Meng, X., Hao, B., Ráth, B. & Kovács, I. A. Path Percolation in Quantum Communication Networks. Phys. Rev. Lett. 134, 030803 (2025).
Title: Distinct statistical characteristics of quantum communication networks
Abstract: Network science emerged around the year 2000, two decades after the birth of the Internet. As a result, much of its focus has been on explaining (rather than designing) the statistical and structural properties, such as scale-freeness and small-world behavior, of existing real-world networks. However, with the quantum Internet still in its early stages, the question arises: can network science actively contribute to the design of large-scale quantum communication networks? In this talk, I will explore how large-scale quantum communication networks can differ fundamentally from their classical counterparts, especially when incorporating various quantum elements like quantum memories, entanglement routing paradigms, and the intricate challenge of multipartite entanglement. These components have the potential to enhance quantum networks not just at the point-to-point level, but at the synergistic, network-wide scale, revealing novel statistical characteristics. This may open the door to a comprehensive, globally integrated (re)design of quantum communication systems—potentially guided by the principles of network science. 1. Hu, X. et al. Unveiling the importance of nonshortest paths in quantum networks. Sci. Adv. 11, eadt2404 (2025). 2. Meng, X., Hao, B., Ráth, B. & Kovács, I. A. Path Percolation in Quantum Communication Networks. Phys. Rev. Lett. 134, 030803 (2025).
Thursday, November 20th, 2025
Journal Club: Keith Glennon
Time: 2:00 PM - 3:00 PM
Location: 515
Title: E11 Symmetries in M Theory  Â
Speaker: Keith Glennon  Â
Abstract: We review the argument that E11 is a symmetry of m-theory at low energies. We will suggest the possibility of an E11 symmetry based on dimensionally reduced coset symmetries of 11D SUGRA. We will argue that a certain induced representation of the semi-direct product of the very extended algebra E8+++ = E11, with its vector representation, results in the equations of motion of the bosonic sector of m-theory at low energies, predicting additional effects beyond the supergravity approximation. We will then review recent developments illustrating K27 as the 26D closed bosonic string analogue of E11, and future questions.
Title: E11 Symmetries in M Theory  Â
Speaker: Keith Glennon  Â
Abstract: We review the argument that E11 is a symmetry of m-theory at low energies. We will suggest the possibility of an E11 symmetry based on dimensionally reduced coset symmetries of 11D SUGRA. We will argue that a certain induced representation of the semi-direct product of the very extended algebra E8+++ = E11, with its vector representation, results in the equations of motion of the bosonic sector of m-theory at low energies, predicting additional effects beyond the supergravity approximation. We will then review recent developments illustrating K27 as the 26D closed bosonic string analogue of E11, and future questions.