The AdS/CFT correspondence, a useful tool in the study of strongly coupled physics, relates fields, including gravity, in a d+1 dimensional asymptotically AdS space-time to operators in a d-dimensional Conformal Field Theory (CFT), in a one-to-one correspondence. The extra spatial dimension appearing in the gravitational side of the duality, the holographic dimension, is in correspondence with an energy scale on the QFT side: fields evolving along the holographic dimension are dual to renormalization group flows of couplings to the dual QFT operators.

Within the next decade or so, neutrino oscillation experiments will (hopefully) pin down the amount of CP violation in the Standard Model lepton sector. From the viewpoint of theory, this exciting prospect stimulates several important questions: How much CP violation do we actually expect from a theoretical perspective? That is, what predictions can we make for the outcome of upcoming experiments?

Some of the most fundamental puzzles in theoretical physics can be phrased as puzzles of technical naturalness.  Examples include the cosmological constant problem, the Higgs mass hierarchy problem, the linear scaling of resistivity with temperature in the strange metal phase of high-tempterature superconductors etc.  I will re-examine the notion of technical naturalness in systems whose short-distance behavior exhibits nonrelativistic symmetries of "Aristotelian spacetime", pointing out various surprises and novelties, with possible applications in particle phenomenology, cosmology and con

The  QCD axion is a curious Dark Matter candidate, having a mass like the neutrino, but behaving as Cold Dark Matter during linear structure formation. I will review how this occurs, and  speculate on the interesting question  of how  axions make galactic halos during non-linear structure formation, and whether  observations could distinguish them from WIMPs.
 

Entanglement entropy is a useful tool which plays an important role in modern physics. The geometrical nature of entanglement entropy explains why it finds so many applications in various fields of physics, from black holes and holography to integrable models and quantum computers.