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Colloquia Archive 2022
This event is a Colloquium.

Relativistic dissipation: from hydrodynamics to effective field theory—Pavel KOVTUN
What is the effective description of macroscopic states in a relativistic theory? Going one step beyond thermodynamics, the simplest classical effective description is given by hydrodynamics. It is well known that relativistic dissipative fluiddynamical equations found in classic textbooks (Weinberg, Landau & Lifshitz) predict violations of causality and nonexistence of ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Physical properties of space and time—Martin BOJOWALD
Since space and time play dynamical roles in general relativity and are measured by physical instruments, they can be expected to participate in quantum features such as fluctuations, correlations and entanglement. This talk presents several canonical methods and results that have demonstrated the possibility of nontrivial features of quantum spacetime ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Primordial Black Holes as a dark matter candidate—Anne GREEN
Diverse astrophysical and cosmological observations indicate that most of the matter in the Universe is cold, dark and nonbaryonic. Traditionally the most popular dark matter candidates have been new elementary particles, such as WIMPs and axions. However Primordial Black Holes (PBHs), black holes formed from over densities in the early ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Inflation as a farm to grow primordial black holes—Misao SASAKI
The existence of primordial black holes (PBHs) was suggested more than half a century ago. However, studies on the PBH formation have remained qualitative until recently. The situation has drastically changed in the last few years. The rapid progress in gravitational wave astrophysics/cosmology has made projections of detecting signatures ...
This event is a Colloquium.

Infinite algebra extensions of spacetime symmetry algebras—Joaquim GOMIS
We introduce the concept of kinematical algebras and
their associated homogeneous spaces where our physical theories live. Some of these algebras are related via Lie algebra contraction.
We develop a framework that captures systematically the corrections to the contraction procedure, for example the nonrelativistic corrections of order v/c, by ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Signals of a Quantum Universe—Daniel GREEN
The idea that structure in the Universe was created from quantum mechanical vacuum fluctuations during inflation is very compelling, but unproven. Finding a test of this proposal has been challenging because the universe we observe is effectively classical. I will explain how quantum fluctuations can give rise to the density ...
Online
This event is a Colloquium.

Modeling largescale structure in the golden age of cosmological surveys—Martin WHITE
The Universe we observe exhibits order on a wide range of scales, and the study of this largescale structure provides one of our premier laboratories for fundamental physics, cosmology and astrophysics. I will present recent advances in analytic models of this large scale structure applicable to the numerous observational programs ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Decoding the Path Integral: Resurgence and Extreme Physics—Gerald DUNNE
How do quantum systems behave under extreme conditions such as ultrahigh density and ultrahigh intensity? This question has applications in a wide range of physical contexts, from condensed matter to particle and nuclear physics, and to astrophysics. The answer requires going beyond perturbation theory, directly to the path integral representation ...
This event is a Colloquium.

The Galileo Project: In Search for Technological Interstellar Objects—Avi LOEB
The search for extraterrestrial life is one of the most exciting frontiers in science. First tentative clues were identified close to Earth in the form of the unusual interstellar object `Oumuamua and Unidentified Aerial Phenomena (UAP) in the Earth's atmosphere. The recently announced "Galileo Project" ushers the new frontier ...
This event is a Colloquium.

A Modern View of Scattering—Henriette ELVANG
Amplitudes encode the probability of scattering processes, such as gluon scattering at the LHC. They harbor an intrinsic mathematical beauty that can be exploited to devise new calculational methods that are far more efficient than Feynman rules. Moreover, their structure also reveals surprising properties, such as relationships between observables of ...
This event is a Colloquium.

Black Hole Informatics—Lárus THORLACIUS
Hawking's black hole information paradox is a subject of longstanding debate that has inspired radical ideas about the interplay between gravity and quantum physics at a fundamental level. I will review the formulation of the paradox in the context of a semiclassical effective field theory of gravity and briefly ...
This event is a Colloquium.

How do Galaxies Work?—Eve OSTRIKER
Galaxies are sometimes described as "factories" where baryons accreted from the cosmic web are locked up as stars. This transformation is, however, is both much less complete and much slower than would be naively expected. Much of the baryonic contents of the Universe is still in gaseous form, both in ...
This event is a Colloquium.

Theories of Baryogenesis and their Tests—Jessica TURNER
In this talk, I will review various theories of baryogenesis ranging from electroweak baryogenesis to low and highscale leptogenesis together with their associated phenomenology. In the case of highscale theories will discuss how gravitational waves can be used as a probe of such theories.
Ahead of her talk, please find ...
Higgs Centre Seminar Room, JCMB
This event is a Colloquium.

Testing gravity with relativistic effects in largescale structure—Camille BONVIN
The distribution of galaxies is a power tool to test our cosmological model. In this talk I will discuss the different contributions that affect the observed distribution of galaxies. I will show that besides the standard density and redshiftspace distortions, the number counts of galaxies is affected by gravitational lensing ...
This event is a Colloquium.

Cluster Crystals: from a theorist’s toy model to experimental realization—Christos LIKOS
Crystals are orderly states of matter in which particles with sizes ranging from subnanometer to micron are arranged in a periodic lattice. Crystalline solids epitomize the notion of rigidity, lying at the antipode of fluidity that is embodied by liquids. Accordingly, hybrid, exotic phases that combine crystallinity with (super)fluidity ...
Higgs Centre Seminar Room, JCMB
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