Physics

I will review the concept of quantum complexity of a state and the related holographic conjectures. I will discuss certain properties of holographic complexity, namely, the structure of divergences, the complexity of forming a thermal state, and the...

Modern methods for computing scattering amplitudes getenormous mileage out of knowledge of (or, often, even assumptions about) their singularity structure. I will demonstrate how, in the case of N=4 SYM theory, information about this singularity...

Holographic theories representing black holes are expected to exhibit quantum chaos. If the laws of quantum mechanics are expected to hold for observers inside such black holes, then such holographic theories must have a mean field approximation...

There is no doubt that there is a revolution going on in machine learning and artificial intelligence, but what does it mean for physics? Is it all hype, or will it transform the way we think about and do physics?I will describe machine learning...

I will talk about loop infrared effects in de Sitter QFT. Namely about their types, physical meaning and origin and also about their resumation.

Boundary state black holes are single sided pure black holeswith an End-of-the-World Brane cutting off the spacetime in the interior. I demonstrate that certain Hamiltonian deformations tuned to the black hole microstate inject negative energy...

A state is said to be Markovian if it fulfills the important condition of saturating the Strong Subadditivity inequality. I will show how the vacuum state of any relativistic QFT is a Markov state when reduced to certain geometric regions of...

Goldstone modes arising from spontaneously broken symmetries can be added to a hydrodynamic description of charge transport to model quantum critical effects in metals from a symmetry point of view. I will discuss the setup and the effects of weak...

Spherical domain walls and vacuum bubbles can spontaneously nucleate and expand during the inflationary epoch in the early universe. After inflation ends, the walls and/or bubbles form black holes with a wide spectrum of masses. For some parameter...