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Colloquia Archive 2019
This event is a Colloquium.

Two dimensional melting of passive and active matter—Leticia CUGLIANDOLO
Longrange translational order is forbidden in low dimensional systems
with shortrange interactions: solid phases only have quasi longrange
translational order. A mechanism for the transition from solid to liquid
led by the dissociation of dislocation pairs was proposed by Kosterlitz &
Thouless in their 1972 & 1973 Nobel prize papers ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Protoplanetary discs: the role of theory in a data rich era—Cathie CLARKE
The last decade has witnessed unprecedented advances in the observational characterisation of protoplanetary discs and their nascent planetary systems, thanks in large part to the transformative capabilities of ALMA (the Atacama Large Millimetre Array). In the first part of my talk I will describe how the relatively simple physics governing ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

A Quantum Universe Before the Big Bang(s)?—Gabriele VENEZIANO
Abstract:
Modern inflationary cosmology avoids the shortcomings of the old hot big bang model by making crucial use of quantum phenomena occurring during inflation as well as at its end.
This simple fact entails a drastic revision of the traditional view identifying the big bang and the beginning of time ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Disk Galaxies: Our Fascinating Cosmic Habitats—Andreas BURKERT
Galaxies are the fundamental building blocks of the Universe. Gasrich spiral disk galaxies are the cosmic islands
where stars and planets form and where the chemical buildings blocks of life are generated. However, despite their importance,
we are still far from a detailed understanding of their structure and the processes ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

The first image of a black hole—Luciano REZZOLLA
I will discuss how the first image of a black hole was recently obtained by the Event Horizon Telescope collaboration. In particular, I will describe how modelling the dynamics of the plasma accreting onto the black hole with supercomputers using millions of compute hours was essential to generate synthetic blackhole ...
LT4, Appleton Tower
This event is a Colloquium.

Collective behavior in animal groups: a statistical physics perspective—Irene GIARDINA
Abstract:
Many animal aggregations display collective patterns on the large scale, ultimately due to the interactions between the individuals in the group. Recent findings on flocks of birds and swarms of insects show that these groups exhibit strong mutual correlations and quick mechanisms of information propagation, signatures of the efficient ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

TimeEnergy Uncertainty Relations for Driven Dynamics and Adiabatic Quantum Computation—Tien KIEU
Abstract:
A new class of timeenergy uncertainty relations is directly derived from the Schroedinger equations for timedependent Hamiltonian H(t). Only the initial states and the Hamiltonians are required for our timeenergy relations, with no requirement of a full solution for a timedependent Hamiltonian.
The general relations we find could ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Fun with Path Integrals—Neil TUROK
Abstract:
Feynman's path integral provides an elegant formulation of quantum physics, particularly suited to theories with continous symmetries, like gauge theories and general relativity. However, it has proven difficult to rigorously define path integrals without first performing a Wick rotation to Euclidean time. Unfortunately, this significantly compromises the study ...
Institute for Astronomy
This event is a Colloquium.

Active Matter and Sustainability: from Plankton to Traffic Flow—Stephan HERMINGHAUS
Abstract:
The most important question of our time is whether, and how, we will be able to run our planet sustainably. Answering this question requires a deep understanding of the earth system, a vast nonequilibrium system which abounds with different activematter susbsystems. Two of them are within the focus of ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Black Holes, Quantum Gravity and Holography: a perspective from (2+1)dim gravity—Alejandra CASTRO
ABSTRACT:
Gravity is intrinsically different from other physical forces. Gravity is geometry. This raises the fundamental question: how does geometry emerge from a quantum theory? Black holes have inspired revolutionary ideas to attack this question, with one impressive outcome being the holographic principle.
In this talk I will review how ...
James Clerk Maxwell Building
This event is a Colloquium.

Clustering and Correlations in Fluctuating Environments—Mustansir BARMA
Abstract:
Shared histories lead to strong correlations. Thus, particles which find themselves in the same evolving environment have a tendency to cluster and approach an interesting state. This talk is about such states, their scaling properties, and how they develop in time. A key signature is that the scaled correlation ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

The Surprising Simplicity of Scattering Amplitudes—Jacob Lewis BOURJAILY
Abstract:
Quantum field theory is the modern manifestation of "force equals mass times acceleration": it is the underlying, mathematical framework in which understand and describe physical laws today—from the most fundamental to the merely effective or approximate.
Quantum field theory is the modern manifestation of "force equals mass times ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Variational Quantum Algorithms—José LATORRE
Small quantum computers are now a reality. They provide the instrument
to test new ways to process information using quantum logic.
We analyze novel ideas to build hybrid quantum algorithms that combine
machine learning with quantum circuits. In particular,
variational methods open the possibility of dealing with nontrivial
optimization problems ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

The Limits of Cosmology—Joseph SILK
One of our greatest challenges in cosmology is understanding the origin of the structure of the universe, and in particular the formation of the galaxies. I will describe how the fossil radiation from the beginning of the universe, the cosmic microwave background, has provided a window for probing the initial ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

The mathematics of burger flipping—JeanLuc THIFFEAULT
Ever since the dawn of time people have (literally) asked the question
 what is the most effective way to grill food? Timing is
everything, since only one surface is exposed to heat at a given time.
Should we flip only once, or many times? I will show a simple model ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Testing General Relativity with Cosmological observations—Ruth DURRER
Abstract:
General Relativity (GR) is immensely successful. With the late discovery of gravitational waves from black hole and neutron star mergers, it has passed all the tests with flying colors. But so far, observations have mainly tested the vacuum equations of GR. The most important nonvacuum case, cosmology, is in ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Physics under the Gravitational Rainbow—Claudia DE RHAM
The recent direct detection of gravitational waves marks the beginning of a new era for physics and astronomy with an opportunity the probe gravity at its most fundamental level. I will discuss how the behaviour of gravity on large scales may differ from General Relativity and its implications for early ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Tensor Network and Quantum Information Theory: Applications in Condensed Matter and High Energy Physics—Ignacio CIRAC
Abstract:
Certain Quantum Manybody states can be efficiently described in terms of tensor networks.
Those include Matrix Product States (MPS), Projected EntangledPair Etates (PEPS), or the
Multiscale Entanglement Renormalization Ansatz (MERA). They play an important role
in quantum computing, error correction, or the description of topological order in
condensed matter ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Causal Sets, Discrete Gravity—Fay DOWKER
Quantum gravity is the name of a problem, not a theory. The problem
is that we do not have a unified framework for fundamental physics in which
both gravity and quantum theory are incorporated. Causal Set Theory is an
approach to the problem based on the hypothesis that spacetime is ...
Higgs Centre Seminar Room, JCMB
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