Physics

Abstract: Radio pulses from rotating neutron stars provide us with spectacularly accurate measurements of their spin frequencies. Surprisingly, young and middle-aged pulsars frequently exhibit irregular evolution of their spin frequencies, with long...

Abstract: I will discuss a geometric approach to the factorization puzzle that involves coadjoint orbits and Berry phases. The mathematical formalism introduced is applied both to quantum mechanics examples and to AdS/CFT.  It is shown how the...

Abstract: Consider the interaction of one-dimensional surface gravity waves on top of an ideal fluid of infinite depth. Notably, for certain orientations of the wave vectors, the interaction matrix element vanishes, while for other orientations, the...

Abstract: This talk will discuss what's new with some of the most interesting looking cosmological tensions: the Hubble tension, the growth of structure tension (S8, growth rate, Lyman Alpha) and Big Bang Nucleosynthesis (Lithium and Deuterium)...

Abstract: We will start with a review of previous results concerning  instabilities of rotating Kerr black holes to massive scalar field perturbations. These instabilities are connected to superradiance and hence do not occur on the Schwarzschild...

Abstract: Quantizing classical systems we consider Hilbert spaces equipped with representations of canonical commutation relations (CCR).  In the case of an infinite number of degrees of freedom it is necessary to consider representations of  CCR...

Abstract: Conformal field theories that exhibit spontaneous breaking of conformal symmetry (a moduli space of vacua) are expectedly rare in the landscape of CFTs. Intuitively, this is because a delicate conspiracy is needed to fine-tune to zero the...

Abstract: The Council of CERN is responsible for formulating the scientific and financial policy of CERN. It does this with strong coordination with the CERN Director General and Management. I will describe how the CERN Council reaches its decisions...