Monday, March 29
12:00 pm - 1:00 pm	Logic Seminar Online Event Fraïssé classes with simply characterized big Ramsey degrees Natasha Dobrinen, Department of Mathematics, University of Denver,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Phenomenology of Magnetic Black Holes Nicholas Orlofsky, Carleton University,
7:30 pm - 9:30 pm	Astronomy on Tap (Mandarin) Online Event "Killer Asteroids" and "Echoes of the Big Bang" Quanzhi Ye, Research Scientist, Department of Astronomy, University of Maryland, Cheng Zhang, PhD Candidate, Department of Physics, Caltech,

Tuesday, March 30
11:00 am - 12:15 pm	Cancelled Chemical Physics Seminar Online Event Ralph Jimenez, Adjoint Associate Professor, Department of Chemistry and Biochemistry, JILA, University of Colorado Boulder,

Wednesday, March 31
12:00 pm - 1:00 pm	Astronomy Colloquium Online Event Multiple Stellar Populations in Star Clusters Anna Fabiola Marino, University of Padova,
2:00 pm - 3:00 pm	High Energy Physics Seminar Online Event Go Big, Go Left: Pushing the Limits of Liquid Xenon Detectors for Dark Matter Detection Alden Fan, KIPAC/Stanford University/SLAC,

Thursday, April 1
4:00 pm - 5:00 pm	Physics Colloquium Online Event AI for physics & physics for AI Max Tegmark, MIT,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event Maass forms and the mock theta function f(q) Alexander Dunn, Department of Mathematics, Caltech,

Friday, April 2
11:00 am - 12:00 pm	High Energy Theory Seminar - CANCELLED Online Event TBD Geoff Penington, UC Berkeley,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Verifying quantum computations using interactive proofs Urmila Mahadev, Assistant Professor of Computing and Mathematical Sciences,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event Halo's Magnetic field as Evident from stRiated Interstellar Clouds (HOMERIC) Aris Tritsis, Postdoctoral Fellow, Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, ANU,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Skein lasagna modules of 2-handlebodies Ikshu Neithalath, Mathematics Department, UCLA,

Monday, April 5
12:00 pm - 1:00 pm	Logic Seminar Online Event Subgroups of PLo(I)PLo^fo(I) which do not embed into Thompson's group FF Justin Moore, Department of Mathematics, Cornell University,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Cosmology and Unification Raman Sundrum, University of Maryland,

Tuesday, April 6
3:00 pm - 3:50 pm	Caltech/UCLA Joint Analysis Seminar Online Event The extremals of the Alexandrov-Fenchel inequality Ramon van Handel, Operations Research & Financial Engineering, Princeton University,
4:00 pm - 4:50 pm	Caltech/UCLA Joint Analysis Seminar Online Event Explicit and nonlinear variants of Bourgain's projection theorem Pablo Shmerkin, Mathematics Department, University of British Columbia,

Wednesday, April 7
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event Revealing Massive Star Mass Loss Through Supernovae Takashi Moriya, Assistant Professor, NOA Japan,

Thursday, April 8
4:00 pm - 5:00 pm	Physics Colloquium Online Event Unveiling Our Dynamic Infrared Sky Mansi Kasliwal, Caltech,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event The Relative Trace Formula and Its Applications Liyang Yang, Department of Mathematics, Caltech,

Friday, April 9
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Probing gravitational EFTs with the four-graviton amplitude Sasha Zhiboedov, CERN,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Universal Lindblad Equation for Open Quantum Systems Frederik Nathan, Postdoctoral Scholar, Refael Group,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event Radiative turbulence in magnetically-dominated astrophysical plasmas Emanuele Sobacchi, Postdoctoral Researcher, Department of Astronomy, Columbia University,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Amphichiral knots with large 4-genera Allison Miller, Mathematics Department, Rice University,

Monday, April 12
9:00 am - 10:00 am	High Energy Physics Seminar Online Event Enabling Searches for Long-lived Particles and Precision Timing at CMS Cristian Peña, Fermilab,
12:00 pm - 1:00 pm	Logic Seminar Online Event The Wadge hierarchy on Zariski topologies Riccardo Camerlo, Department of Mathematics, University of Genoa,

Wednesday, April 14
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event The NANOGrav 12.5-Year Data Set: Knocking at the Gravitational Wave Door Maura McLaughlin, Eberly Family Distinguished Professor, Department of Physics and Astronomy, West Virginia University,

Thursday, April 15
9:00 am - 9:55 am	Analysis Seminar Online Event On the stability of classical boundary layers Toan Nguyen, Mathematics Department, Pennsylvania State University,
4:00 pm - 5:00 pm	Physics Colloquium Online Event Active Topology Cristina Marchetti, UC Santa Barbara,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event The distribution of closed geodesics on the modular surface Alexandre Perozim de Faveri, Department of Mathematics, Caltech,

Friday, April 16
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Dynamics of 1+1 Dimensional Gauge Theories and Exotic Symmetries Zohar Komargodski, Simons Center for Geometry and Physics,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Building a quantum computer with cat codes Fernando Brandão, Bren Professor of Theoretical Physics, Head of Quantum Algorithms AWS,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event A hidden Markov model search for gravitational waves from twelve young supernova remnants Meg Millhouse, Postdoctoral Research Fellow, School of Physics, University of Melbourne,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Existence of static vacuum extensions Lan-Hsuan Huang, Department of Mathematics, University of Connecticut,
4:00 pm - 5:00 pm	Math Graduate Student Seminar Online Event Operator algebras and the emergence of spacetime Elliott Gesteau, Department of Mathematics, Caltech,
7:00 pm - 9:00 pm	Stargazing Lecture Online Event Endless Hunt for Black Holes Wenbin Lu, David and Ellen Lee Postdoctoral Scholar Research Associate, Department of Theoretical Astrophysics, Caltech,

Sunday, April 18
8:00 am - 2:00 pm	Barry Simon's 75th Birthday Conference Online Event

Monday, April 19
12:00 pm - 1:00 pm	Logic Seminar Online Event A characterization of high transitivity for groups acting on trees François Le Maître, Jussieu Mathematics Institute – PRG, University of Paris,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Dark photons and the cosmic radiation background Hongwan Liu, Princeton University,
4:00 pm - 5:00 pm	H.B. Keller Colloquium Online Event Improving Policy Learning via Programmatic Domain Knowledge Yisong Yue, Professor of Computing and Mathematical Sciences, Computing and Mathematical Sciences Dept., California Institute of Technology,

Tuesday, April 20
10:00 am - 10:50 am	Caltech/UCLA Joint Analysis Seminar Online Event The mysteries of low-degree Boolean functions Nathan Keller, Department of Mathematics, Bar Ilan University,
11:00 am - 12:15 pm	Chemical Physics Seminar Online Event Ionic transport in nanoscale fluids far from equilibrium David Limmer, Assistant Professor of Chemistry, College of Chemistry, University of California, Berkeley,
11:00 am - 11:50 am	Caltech/UCLA Joint Analysis Seminar Online Event On the zeros of Fekete polynomials Oleksiy Klurman, School of Mathematics, University of Bristol,

Wednesday, April 21
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event Cosmology with Massive Neutrinos Jia Liu, Postdoctoral Fellow, University of California, Berkeley,
5:00 pm - 6:00 pm	Watson Lecture - Sunlight to Everything: Catalyzing a Sustainable Future Online Event Jonas Peters, Bren Professor of Chemistry and Director of the Resnick Sustainability Institute, Division of Chemistry and Chemical Engineering, Caltech,

Thursday, April 22
9:00 am - 9:55 am	Analysis Seminar Online Event On the well-posedness of the derivative nonlinear Schr\"odinger equation Maria Ntekoume, Department of Mathematics, Rice University,
4:00 pm - 5:00 pm	Physics Colloquium Online Event The Dark Phase of Quantum Matter Louis Taillefer, Université de Sherbrooke and CIFAR,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event A conjecture of Perrin-Riou Ashay Burungale, Department of Mathematics, Caltech,

Friday, April 23
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Real-time gravitational replicas Mukund Rangamani, UC Davis/QMAP,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Prethermalization and dynamics in topological SYK pumps Iliya Esin, Postdoctoral Scholar, Refael Group,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event The Faintest Galaxies and their Dark Matter Halos Ethan Nadler, Graduate Student, KIPAC, Stanford University,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event The failure of the 4D light bulb theorem with dual spheres of non-zero square Hannah Schwartz, Department of Mathematics, Princeton University,

Monday, April 26
12:00 pm - 1:00 pm	Logic Seminar Online Event A dichotomy for countable unions of smooth Borel equivalence relations Noé de Rancourt, Kurt Gödel Research Center, University of Vienna,
7:30 pm - 9:30 pm	Astronomy on Tap Online Event "The First Stars and Galaxies in the Universe" Evan Nuñez, PhD Candidate, Department of Astronomy, Caltech, Rebecca Larson, PhD Candidate, Department of Astronomy, University of Texas, Austin,

Tuesday, April 27
11:00 am - 12:15 pm	Chemical Physics Seminar Online Event New Theoretical Approaches to Investigate Light-Matter Interactions Pengfei (Frank) Huo, Assistant Professor of Chemistry, Department of Chemistry, University of Rochester,

Wednesday, April 28
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event Small But Mighty: The Tiniest White Dwarf and Other Stories Ilaria Caiazzo, Sherman Fairchild Postdoctoral Scholar, Theoretical Astrophysics, California Institute of Technology,

Thursday, April 29
9:00 am - 9:55 am	Analysis Seminar Online Event Wave decay on asymptotically flat spacetimes Peter Hintz, Department of Mathematics, MIT,
12:00 pm - 1:00 pm	Physics Colloquium Online Event New Directions for Light Dark Matter Yonit Hochberg, Hebrew University,

Friday, April 30
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Towards Lefschetz thimbles in sigma models Nikita Nekrasov, SCGP,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Algebraic fibrations of surface-by-surface groups Stefano Vidussi, Department of Mathematics, University of California, Riverside,

Monday, May 3
10:00 am - 11:00 am	High Energy Physics Seminar Online Event Beyond Lorentz's Lamp-post: Positivity Bounds for Cosmology Scott Melville, DAMTP, University of Cambridge,

Tuesday, May 4
10:00 am - 10:50 am	Caltech/UCLA Joint Analysis Seminar Online Event Rigidity results for measurable sets Dorin Bucur, Laboratoire de Mathématiques, Université de Savoie,
11:00 am - 11:50 am	Caltech/UCLA Joint Analysis Seminar Online Event The matrix-weighted Hardy-Littlewood maximal function is unbounded Stefanie Petermichl, Departement de Mathematiques, Universite Paul Sabatier, Toulouse,

Wednesday, May 5
12:00 pm - 1:00 pm	High Energy Theory Seminar Online Event A Finite S-matrix Hofie Hannesdottir, Harvard University,
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event Black Hole Mass Measurement with ALMA Aaron Barth, Professor, Department of Physics and Astronomy, University of California, Irvine,

Thursday, May 6
12:00 pm - 1:00 pm	Diverse Minds Seminar Online Event More than one sensorial modality to do mainstream science in astronomy? Dr. Wanda Díaz-Merced, Astronomer,
12:00 pm - 1:00 pm	High Energy Physics Seminar Online Event Nonstandard thermal histories and the small-scale matter power spectrum Jessie Shelton, UIUC,
4:00 pm - 5:00 pm	Physics Colloquium Online Event The Cosmological Bootstrap Daniel Baumann, University of Amsterdam,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event Sarnak's density hypothesis in horizontal families Mikołaj Frączyk, Department of Mathematics, The University of Chicago,

Friday, May 7
9:00 am - 10:00 am	TAPIR Seminar Online Event The cycle of matter in the magnetized interstellar medium as revealed by machine vision Juan Diego Soler, Postdoctoral Fellow, Dept of Planet and Star Formation, MPIA Heidelberg,
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Flatspace Holography: Celestial Amplitudes and Symmetries Monica Pate, Harvard University,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Definite surfaces, plumbing, and Tait's conjectures Thomas Kindred, Department of Mathematics, University of Nebraska-Lincoln,

Monday, May 10
12:00 pm - 1:00 pm	Logic Seminar Online Event Arcs, knots, and convex embeddability Luca Motto Ros, Mathematics Department, University of Turin,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Cosmology at the end of the world Brian Swingle, Brandeis University,
7:30 pm - 9:30 pm	Astronomy on Tap Online Event "Lunar Radio Telescope" and "SOFIA Telescope Aboard a 747 Jet" Saptarshi Bandyopadhyay, Robotics Technologist, Jet Propulsion Laboratory, Sabrina Pakzad, Mission Operations Specialist, NASA SOFIA Telescope,

Wednesday, May 12
4:00 pm - 5:00 pm	Astronomy Colloquium Online Event Don't Fear the Spiders: New Insights from Redback Millisecond Pulsars Jay Strader, Associate Professor, Department of Physics and Astronomy, Michigan State University,
5:00 pm - 6:00 pm	Watson Lecture - From the Soil to the Clinic: How Infection-Causing Microbes Thrive Without Oxygen Online Event Dianne K. Newman, Gordon M. Binder/Amgen Professor of Biology and Geobiology and Executive Officer for Molecular Biology, Division of Biology and Biological Engineering, Caltech,

Thursday, May 13
4:00 pm - 5:00 pm	Physics Colloquium Online Event Searching for Dark Matter Interactions throughout Cosmic History Kim Boddy, UT Austin,

Friday, May 14
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Worldsheet correlators in AdS3 Lorenz Eberhardt, Institute for Advanced Study,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event Ultra-High-Energy Cosmic Rays and Neutrinos from relativistic jets of Active Galactic Nuclei Rostom Mbarek, Graduate Student, Department of Astronomy and Astrophysics, The University of Chicago,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Khovanov homology via Floer theory of the 4-punctured sphere Artem Kotelskiy, Department of Mathematics, Indiana University Bloomington,

Monday, May 17
12:00 pm - 1:00 pm	Logic Seminar Online Event Orbit equivalence and wreath products Robin Tucker-Drob, Department of Mathematics, Texas A&M University,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Thermal Squeezeout of Dark Matter Pouya Asadi, MIT,
7:30 pm - 9:30 pm	Astronomy on Tap (Español) Online Event "Mini Agujeros Negros" and "Enanas Marrones" Lluis Mas-Ribas, Postdoctoral Fellow, Jet Propulsion Laboratory, Daniella Bardalez Gagliuffi, Postdoctoral Fellow, American Museum of Natural History,

Tuesday, May 18
3:00 pm - 3:50 pm	Caltech/UCLA Joint Analysis Seminar Online Event Tiling the integers with translates of one tile: the Coven-Meyerowitz tiling conditions for three prime factors Izabella Laba, Department of Mathematics, University of British Columbia,
4:00 pm - 4:50 pm	Caltech/UCLA Joint Analysis Seminar Online Event Energy of the Dilute Bose Gas in 3D Søren Fournais, Department of Mathematics, Aarhus University,

Wednesday, May 19
1:30 pm - 2:30 pm	High Energy Theory Seminar Online Event Obstructions to Gapped Boundaries for (2+1)d TQFT Justin Kaidi, SCGP,
4:00 pm - 5:00 pm	Astronomy Colloquium Studying the Universe with Gravitational Waves: From Neutron Stars to Tests of Gravity Katerina Chatziioannou, Assistant Professor of Physics, Division of Physics, Mathematics and Astronomy, California Institute of Technology,
7:00 pm - 8:00 pm	A Conversation with Alibaba Chairman and CEO Daniel Zhang Online Event

Thursday, May 20
4:00 pm - 5:00 pm	Physics Colloquium Online Event Black Holes - Nature or Nurture?: The Roles of Rotation and Accretion in Powering Cosmic Sources Roger Blandford, Stanford University,

Friday, May 21
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event From AdS/CFT to soft theorems in flat space Eliot Hijano, Princeton University,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event Synchrotron Boilers in Embryonic Neutron-Star Wind Nebulae Kazumi Kashiyama, Assistant Professor, School of Science, University of Tokyo,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Ancient solutions to mean curvature flow Theodora Bourni, Department of Mathematics, University of Tennessee, Knoxville,
7:00 pm - 9:00 pm	Stargazing Lecture Online Event The Surprising World of Pulsars Amruta Jaodand, Postdoctoral Fellow, Department of Astronomy, Caltech,

Monday, May 24
12:00 pm - 1:00 pm	Logic Seminar Online Event Borel factor maps and embeddings between actions of Z^d Spencer Unger, Department of Mathematics, University of Toronto,
4:00 pm - 5:00 pm	High Energy Physics Seminar Online Event Two short tales of axions JiJi Fan, Brown University,

Wednesday, May 26
4:00 pm - 5:00 pm	Astronomy Colloquium - Neugebauer Lecture Online Event Our Galactic Center: A Unique Laboratory for the Physics & Astrophysics of Black Holes Andrea Ghez, Lauren B. Leichtman and Arthur E. Levine Professor of Astrophysics, Department of Physics and Astronomy, University of California, Los Angeles,

Thursday, May 27
4:00 pm - 5:00 pm	Physics Colloquium Online Event Cavity acoustodynamics: insight into quantum noise in materials and opportunities for quantum computing Oskar Painter, Caltech,

Friday, May 28
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Cosmology from confinement Mark van Raamsdonk, University of British Columbia,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Quantum Weak Coin Flipping—where weakness is a virtue Atul Singh Arora, Postdoctoral Scholar, Vidick Group,
2:00 pm - 3:00 pm	TAPIR Seminar Online Event The extreme-mass-ratio-inspiral problem Alvin Chua, Postdoctoral Scholar, TAPIR, Caltech,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Lens space surgeries, lattices, and the Poincaré homology sphere Jacob Caudell, Mathematics Department, Boston College,

Tuesday, June 1
12:00 pm - 1:00 pm	postponed until 2/15/22 Chemical Physics Seminar Online Event Revealing the scaling properties of matter through designer low-dimensional crystals Thomas Kempa, Assistant Professor, Department of Chemistry, John Hopkins University,

Thursday, June 3
4:00 pm - 5:00 pm	Physics Colloquium Online Event Emergence of Statistical Mechanics via Spontaneous Breaking of Unitarity Victor Galitski, University of Maryland,
4:00 pm - 5:00 pm	Number Theory Seminar Online Event The Skinner--Urban method and the symmetric cube Bloch--Kato conjecture Samuel Mundy, Department of Mathematics, Columbia University,

Friday, June 4
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event Symmetries and Completeness in Field Theories and Gravity Jacob McNamara, Harvard University,
11:00 am - 12:00 pm	IQIM Postdoctoral and Graduate Student Seminar Online Event Polyatomic molecules for quantum science and fundamental physics Nick Hutzler, Assistant Professor of Physics,
11:00 am - 12:00 pm	High Energy Theory Seminar Online Event
2:00 pm - 3:00 pm	TAPIR Seminar Online Event Cosmic Ray Transport and Influence in Multiphase Environments Chad Bustard, Postdoctoral Fellow, KITP, UC Santa Barbara,
3:00 pm - 4:00 pm	Geometry and Topology Seminar Online Event Ancient solutions in geometric flows Natasa Sesum, Department of Mathematics, Rutgers University,

Monday, June 7
12:00 pm - 1:00 pm	Logic Seminar Online Event A new proof of a theorem of Giordano, Putnam, and Skau Julien Melleray, Institut Camille Jordan, Université Lyon 1,
7:30 pm - 9:30 pm	Astronomy on Tap Online Event "South Pole Cosmology" & "Black Holes Illuminate Galaxies" Junhan Kim, Postdoctoral Fellow, Department of Astronomy, Caltech, Britt Lundgren, Assistant Professor, Department of Physics, University of North Carolina, Asheville,

Tuesday, June 8
10:00 am - 10:50 am	Caltech/UCLA Joint Analysis Seminar Online Event Fundamental Gap Estimate for Convex Domains Guofang Wei, Department of Mathematics, UC, Santa Barbara,
11:00 am - 11:50 am	Caltech/UCLA Joint Analysis Seminar Online Event Some applications of analysis over finite field Tama Ziegler, Einstein Institute of Mathematics, Hebrew University,

Wednesday, June 9
12:00 pm - 1:00 pm	Astronomy Colloquium Online Event SRG Orbital Observatory: X-Ray Map of the Universe with a Million Accreting Supermassive Black Holes and Thirty Thousand Clusters of Galaxies Rashid Sunyaev, Director, Department of High Energy Astrophysics, Max Planck Institute for Astrophysics,

Thursday, June 10
4:00 pm - 5:00 pm	Physics Colloquium Online Event Carving out Theory Space David Simmons-Duffin, Caltech,
4:00 pm - 5:00 pm	Physics Colloquium Online Event