### What’s inside a black hole? Probing the interior of black holes with gravitational waves

##### Ramy Brustein (Ben Gurion U. of Negev)

I will present general arguments, based on fundamental physics principles, as to why we should expect a significant, horizon scale, departure from semiclassical gravity inside astrophysical black holes. Then, I will…

### Astrophysics Seminar: Interstellar Interlopers and Dark Comets

##### Darryl Seligman (Cornell University)

In recent years, two entirely new classes of planetesimals have been discovered in the solar system: interstellar interlopers and dark comets. These still-enigmatic objects are challenging our understanding of the…

### Condensed Matter Seminar: Magnetic Chirality

##### Sang-Wook Cheong (Rutgers University)

Chirality, which arises from the breaking of mirror symmetries combined with any spatial rotations, plays a ubiquitous role in a wide range of phenomena, from the DNA…

### High Energy Seminar: Nonlinear Black Hole Ringdown

##### Macarena Lagos (Columbia University)

Gravitational waves (GWs) offer a unique observational window into the nature of gravity. In particular, the remnant black hole formed after the merger of two compact objects emits GWs with a…

### Elon Musk Public Lecture: "The Many Worlds of Quantum Mechanics"

##### Sean Carroll (Johns Hopkins University)

One of the great intellectual achievements of the twentieth century was the theory of quantum mechanics, according to which observational results can only be predicted probabilistically rather than with…

### Astrophysics seminar: The Red Universe UNCOVERed: Early Spectral results from the JWST Treasury Survey UNCOVER

##### Jenny Greene (Princeton University), https://crispygreene.wixsite.com/jenny

From brown dwarfs to the first galaxies, JWST is giving us a new look at the Universe in the infrared. UNCOVER has just completed a deep spectroscopic survey in the Hubble Frontier Field Abell 2744. I will discuss…

### Condensed Matter Seminar: Multi-gap topological physics: geometrical notions, physical phases and novel response

##### Robert-Jan Slager (University of Cambridge)

I will review recent work on multi-gap topological states. These phases are characterized by topological structures that cannot be captured by advances in more conventional symmetry-based…

### High Energy Theory seminar: Gluon scattering in AdS from supersymmetric localization

##### Pietro Ferrero (SCGP)

I will discuss some of the recent progress made in the computation of holographic correlators describing the scattering of gluons in anti de Sitter space.…

### Colloquium: "The First 250 Years of Physics and Astronomy at Penn"

##### Paul Heiney (University of Pennsylvania Emeritus)

The histories of physics and astronomy at Penn will be presented primarily through the lives of prominent individuals, culminating in the 1994 merger of the Physics and Astronomy Departments. We…

### High Energy Theory seminar: Self-Similar Quasicrystals and Hyperbolic Honeycombs

##### Justin Kulp (SCGP)

Most people are familiar with periodic tessellations and lattices; from the sidewalk outside David Rittenhouse Laboratory to their favourite spin systems. In this talk, I will discuss two less familiar…