I describe the analysis of the Standard Model of particle physics that has led a generation to believe that there is (accessible) physics beyond it. I also introduce the idea of the multiverse that has shaken that belief. Then I present the impact data from the Large Hadron Collider has ...
The present understanding of the properties of the recently discovered Higgs
boson is discussed, based on the most recent results from the ATLAS
experiment. These results include measurements of the mass, spin, production
mechanisms, and couplings to fermions and bosons, and are based in most cases
on the full data ...
The term Tensor Network States (TNS) encloses a number of families that
represent different ansatzes for the efficient description of the state of a
quantum many-body system. The first of these families, Matrix Product States
(MPS), lies at the basis of Density Matrix Renormalization Group methods,
which have become the ...
Variational principles of fluid turbulence offer an attractive alternative to
numerical solution of the Navier-Stokes equation, especially for global
climate studies. In this talk I'll discuss the conjecture of maximum kinetic
energy dissipation and its application to turbulent channel flow and climate
systems, as well as its theoretical basis ...
I will summarize the status of the Higgs boson after the first run
of the LHC. The emphasis will be on interpreting the Higgs results as
constraints on physics beyond the Standard Model. I will discuss a general
effective Lagrangian that allows one to parametrize deviations of the Higgs
With the successes of observational cosmology, a new window has opened up on
to gravitational physics. By carefuly measuring the morphology and growth of
structure in the Universe it may be possible to constrain general relativity
on a completely new range of scales. It also allows us to explore a ...
The cellular world is inhabited by a myriad of microorganisms able to self-
propel, including many bacteria, spermatozoa, ciliates, and plankton. Here, we
focus on the biophysics of ciliary locomotion. Cilia are short slender
whiplike appendages (a few microns long, one tenth of a micron wide)
internally actuated by molecular ...
The average quantum physicist on the street would say that a quantum-
mechanical Hamiltonian must be Dirac Hermitian (invariant under combined
matrix transposition and complex conjugation) in order to guarantee that the
energy eigenvalues are real and that time evolution is unitary. However, the
Hamiltonian H=p^2+ix^3 ...
This talk will review a series of results obtained recently on the
fluctuations of current in diffusive systems for several geometries: steady
state obtained by contact with two reservoirs or two heat baths, system at
equilibrium on a ring geometry, two systems at unequal temperatures which are
connected at time ...
The European Space Agency's Planck satellite was launched on 14 May 2009, and
has been surveying the sky stably and continuously since 13 August 2009. In
March of 2013, ESA and the Planck Collaboration released to the public a first
complete set data products. I will review some of ...
CSEC Lecture Theatre, James Clerk Maxwell Building
"Frames" consisting of nodes connected pairwise by rigid rods or central-force
springs can model systems as diverse as architectural structures, crystalline
and amorphous solids, granular matter, and protein structures. The rigidity
of these networks depends on their average coordination number z: If z is
small enough, the system has internal ...
CSEC Lecture Theatre, James Clerk Maxwell Building
Observing new physics at hadron colliders requires a detailed description of
multi-particle scattering events. It is not practical to evaluate Feynman
diagrams directly for all significant processes. Moreover, adding all diagrams
reveals many cancellations: scattering amplitudes in gauge theories such as
QCD take remarkably simple forms. This simplicity is a ...
I will discuss three apparently unrelated subjects: (i) Wishart random
matrices that appear in statistics and data analysis; (ii) Vicious Random
Walkers model in statistical mechanics introduced by de Gennes and Fisher;
(iii) pure Yang-Mills gauge theory in two dimensions on a sphere. The goal of
this talk is to ...
I briefly review models of dark energy. These include models of a
cosmological constant including those arising in string theory, and dynamical
models where a scalar field may be responsible for the observed late time
acceleration, through to the possibility that we are not fully in control of
the gravity ...
Active Matter is composed of particles each supplied with energy which it
dissipates, often resulting in systematic movement. Examples include living
organisms, their motile constituents and some surprising mechanical and
chemical analogues. These strongly driven systems offer a new arena in which
to study the interplay of broken symmetry, conservation ...
Over the last decade, considerable effort has been expended to understand how
subtle correlations in the pattern of hot- and cold-spots in the cosmic
microwave background anisotropy, or the details of galaxy clustering, can
teach us about physics at very high energies. I will review this effort and
explain how ...
Predictions for scattering processes at particle colliders are done using
perturbation theory, mostly using Feynman diagrams. Increasing precision
requires increasing the order to which one computes, but sheer complexity puts
a block on that road. Even worse, the corrections in many situations are too
large for comfort. In this talk ...
I consider the non-equilibrium time evolution after a "quantum quench": an
isolated many-particle system is initially prepared in its ground state and at
time t=0 a parameter such as a magnetic field or an interaction strength is
changed suddenly. I discuss realisations of such effects in systems of ultra- ...