String theory landscape of vacua point to new consistency conditions that a quantum gravitational system must satisfy. There are only a small number of quantum field theories that satisfy these conditions and all the rest belong to the `Swampland' which cannot be consistently coupled to gravity. In this talk I review some of these conditions...

# Events Archive

## Donald R. Hamilton Colloquium

### Hamilton Colloquium Series, Cumrun Vafa, Harvard University, "The String Landscape and the Swampland"

### Hamilton Colloquium Series, Charles M Marcus, NBI, "The Search for Fractional Statistics"

Panel discussion with Duncan Haldane (Princeton), Michael Manfra (Purdue) and Gwendal Feve (ENS)

### Hamilton Colloquium Series, Monika Schleier-Smith, Stanford University, "Choreographing Quantum Spin Dynamics with Light"

The power of quantum information lies in its capacity to be non-local, encoded in correlations among two, three, or many entangled particles. Yet our ability to produce, understand, and exploit such correlations is hampered by the fact that the interactions between particles and ordinarily local.

### Hamilton Colloquium Series, Andrei Beloborodov, Columbia University, "Explosive Neutron Stars"

Neutron stars are by far the strongest known magnets in the universe. Some of them (called magnetars) generate explosions by suddenly dissipating magnetic energy with a rate up to $10^{47}$ erg/s. These magnetic explosions emit giant gamma-ray flares observed in our and neighboring galaxies.

### Hamilton Colloquium Series, Jenny Greene, Princeton University, "Exploring Supermassive Black Holes"

**Panel Discussion with Suvi Gezari, Brian Metzger and Marta Volonteri**

### Hamilton Colloquium Series, Leonid Mirny, MIT, "Physics of Your Chromosomes" via Zoom

DNA of the human genome is 2 meters long and is folded into chromosomes that fit in a 10-micron cellular nucleus. I will discuss physical principles that govern folding of long DNA molecules, including phase separation, topological effects in polymer systems, and non-equilibrium phenomena.

### Hamilton Colloquium Series, Luis Fernando Alday, Oxford University, "Quantum Scattering Amplitudes in AdS/CFT"

The AdS/CFT correspondence maps correlators of local operators in a conformal field theory to scattering amplitudes in a gravitational/string theory on curved space-time. The study of such amplitudes is incredibly hard and has mostly been done in a certain classical limit. We show how modern analytic bootstrap techniques allow us to go much...

### Hamilton Colloquium Series, Ricard Alert, Princeton University, "The Physics of Collective Cell Migration"

Cells in our body move in groups during development, wound healing, and tumor spreading. Bacterial cells also coordinate their motion to aggregate into biofilms, to feed cooperatively, and to form fruiting bodies.

### Hamilton Colloquium Series, Thierry Mora,Ecole Normale Supérieure de Paris, "Diversity and Memory in Self-Organised Immune Repertoires"

The immune system is composed of a large number of heterogenous interacting components that collectively recognize and clear pathogens.

### Hamilton Colloquium Series, Steve Cowley, Princeton Plasma Physics Laboratory, "Driving Down the Cost of Fusion Power Through Technical Innovation"

The National Academy has recently called for the US to adopt a strategy to produce fusion electricity from a compact pilot plant by mid-century. This approach requires innovations in technology (e.g. magnet systems and power handling systems) and innovations in physics.

### Hamilton Colloquium Series, Michal Lipson, Columbia University, "The Revolution of Silicon Photonics" Jadwin A-10

We are now experiencing a revolution in optical technologies, where one can print and control massive optical circuits, on a microelectronic chip. This revolution is enabling a whole range of applications that are in need for scalable optical technologies and it is opening the door to areas that only a decade ago were unimaginable.

### Hamilton Colloquium Series, Michelle Simmons, University of New South Wales, Australia, "Atomic Qubits in Silicon"

Building a quantum computer in the highly manufacturable material silicon offers many advantages. Phosphorus atom qubits in silicon in particular have demonstrated extremely long (up to 35 s) coherence times with >99.9% fidelity.

### Hamilton Colloquium Series, Sheperd S. Doeleman, Center for Astrophysics | Harvard & Smithsonian, "The Event Horizon Telescope: Imaging a Black Hole"

The Event Horizon Telescope (EHT) is a Very Long Baseline Interferometry (VLBI) array operating at the shortest possible wavelengths, which can resolve the event horizons of the nearest supermassive black holes.

### Hamilton Colloquium Series, Allan H. MacDonald, University of Texas at Austin, "Magic Angle Twisted Bilayer Graphene" Jadwin A10

Moiré patterns are ubiquitous in layered van der Waals materials and can now be fabricated with considerable control by combining mechanical exfoliation of van der Waals layers with tear and stack device fabrication techniques. I will explain why the electronic and optical properties of two-dimensional semiconductors and semimetals are...

### Hamilton Colloquium Series, Adam Burrows, Princeton University, "Supernova Explosion Simulations in Three Dimensions" Jadwin A10

Using our state-of-the-art code Fornax we have simulated the collapse and explosion of the cores of many massive-star models in three spatial dimensions.

### Hamilton Colloquium Series, Gerard 't Hooft, Utrecht University, "The Quantum Black Hole: How Exotic Physics May Enter"

Quantising a black hole can be done starting with conventional physics. We just assume matter to keep the form of point particles until they come close to the horizon. The gravitational back reaction of these particles generates a novel relation between particles going in and particles going out, enabling us to transform in-going particles into...

### Hamilton Colloquium Series, Silviu Pufu, Princeton University "Conformal Field Theory: From Boiling Water to Quantum Gravity"

Conformal Field Theory (CFT) is a framework used to describe physical systems with no intrinsic length or energy scales. CFTs have wide applicability across theoretical physics, ranging from critical points in the phase diagrams of water or magnetic materials to the low-energy dynamics of extended objects in string theory.

### Hamilton Colloquium Series, Lawrence Sulak, Boston University, “Discovering the Electro-Weak Force, Seeing a Supernova Explode, Peering Inside the Sun, & Watching Neutrinos Oscillate”

Cosmological hypotheses and oracular dreams of grandly unifying all the forces of nature foretold: neutrinos might weigh a tiny bit, those elusive particles might blow up stars, and the protons (and your ashes) would transform into light in 1029 years. Indeed, that man can live to 100, without the radioactivity in his bones killing him, proves...

### Hamilton Colloquium Series, Pupa Gilbert, University of Wisconsin-Madison,"How Organisms Build Crystals"

Crystalline biominerals cost energy but provide the diverse organism making them with scaffolding, shielding, locomotion, mastication, gravity and magnetic field sensing, etc.

### Hamilton Colloquium Series, Hirosi Ooguri, Caltech, "Constraints on Quantum Gravity"

Superstring theory is our best candidate for the ultimate unification of general relativity and quantum mechanics. Although predictions of the theory are typically at extremely high energy and out of reach of current experiments and observations, several non-trivial constraints on its low energy effective theory have been found.