Black holes are the elementary particles of gravity, the
final state of sufficiently massive stars and of energetic collisions. With a
forty-year long history, black hole physics is a fully-blossomed field which
promises to embrace several branches of theoretical physics. Here I review the
main developments in highly dynamical black holes with an emphasis on high
energy black hole collisions and probes of particle physics via superradiance.
I discuss several recent efforts
in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS
correlation functions to direct perturbative calculations and
integrability-assisted methods. I review the next-to-leading order agreement
between strings and perturbation theory in the SO(6) sector, a conjectured
extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from
the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the
leading order; finally, I discuss the issue of equating exactly extremal and
non-extremal correlators at NLO in the integrability-assisted calculation.
Physics
is at a crossroad that leads either to Naturalness or the Multiverse. While the
confirmation of gauge coupling unification in the early 90s gave a tremendous
boost to naturalness and to low energy SUSY, the lack of evidence
for new physics beyond the standard model at the LHC points to a paucity of new
particles near the weak scale. This suggests that the weak scale is tuned and
that supersymmetry, if present at all, is realized at higher energies. This
points to Split SUSY, a framework motivated by the String Landscape. Fine-tuning
electroweak symmetry breaking and the renormalization group evolution of
the scalar masses constrains Split model building and I review the expectations
at the LHC for the different possible Split SUSY particle spectra.
In the study of the string/gauge theory duality (AdS/CFT), an important role is played by the relation between local operators and Wilson loops. Perhaps the most well known example is the relation between twist two operators and the light-like cusp Wilson loop. On the string side, the twist two operator is represented by a "long" string (GKP). In this talk I use T-duality to argue that such relation is also natural for "short" strings. I discuss some examples and present a map between the shape of a short string crossing the Poincare horizon and the shape of a corresponding Wilson loop. Based on arXiv:1212.4886 with Arkady Tseytlin (Imperial College).
I introduce a new
nonrelativistic effective field theory which systematically accounts for the finite lifetime effects in production of unstable
particles.
The theory is applied to the threshold production of top quark-antiquark
pairs.
The
holographic correspondence is a powerful duality between a quantum theory of
gravity and a quantum gauge theory in one lower space-time dimension. Higher
spin gravity theories, i.e. gravity theories that also contain (gauge) fields
of spins greater than 2, play a special role in holography. I will explain
consistent interacting higher spin gravity theories in anti-de Sitter space,
their duality with gauged conformal vector models, and their connection to
string theory.