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This series covers all areas of research at Perimeter Institute, as well as those outside of PI's scope.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.


Mardi avr 12, 2016

The coalescence of black hole-black hole (BHBH), black hole-neutron star (BHNS) and neutron star-neutron star (NSNS) systems are among the most promising sources of gravitational waves (GWs) detectable by Advanced LIGO/Virgo and NANOGrav. In addition, distinct observable electromagnetic radiation may accompany these GWs. Such "multi-messenger" sources can be powerful probes of fundamental physics such as the state of matter under extreme conditions, cosmology, as well as our theories of gravity.



Mercredi avr 06, 2016

Bott periodicity (1956) is a classical and old result in mathematics.

Its easiest incarnation of which concerns Clifford algebras. It says

that, up to Morita equivalence, the real Clifford algebras Cl_1(R),

Cl_2(R), Cl_3(R), etc. repeat with period 8. A similar result holds

for complex Clifford algebras, where the period is now 2. The modern

way of phrasing Bott periodicity in is terms of K-theory: I will

explain how one computes K-theory, and we will see the 8-fold Bott



Mercredi mar 30, 2016

Almost fifteen years after LIGO started listening to the cosmos, and 100 years after Einstein discovered general relativity, gravitational waves have been detected by ground-based interferometers, opening a new window on the universe. In this talk I will address some of the most exciting areas of research advanced LIGO will allow us to explore in the coming years. Detection and characterization of gravitational wave transients will be discussed, as well as their impact on astrophysics.



Jeudi mar 24, 2016

In recent decades probing for the subtle indications of new physics in

experimental data has become increasingly difficult. The datasets have gotten

much bigger, the experiments more complex, and the signals ever smaller. Success

stories, like LIGO and Kepler, require a sophisticated combination of statistics

and computation, coupled with an appreciation of both the experimental realities

and the theoretical framework governing the data.



Lundi mar 21, 2016

I will begin by giving an overview of the current state of exoplanet

science, a field that has advanced tremendously in just the last few

years. While specialized instrumentation and observational facilities

have provided the data driving this advance, the development and

application of statistical techniques to interpret this data have been

of critical importance. These same tools are also at the core of all

data-driven science, and are thus applicable to many other fields of



Jeudi mar 17, 2016

Gravitational waves, as predicted by Einstein one hundred years ago, have been detected by the advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) in September last year. This finding marks the beginning of gravitational-wave astronomy. From now on, we are able to probe our universe using both long-range forces in nature.



Mercredi mar 09, 2016

In any quantum field theory, the energy flux at a point of spacetime can be negative. This would produce a repulsive gravitational field causing nearby light rays to defocus. This in turn threatens to produce a variety of exotic phenomena including traversable wormholes, warp drives, time machines, and evasion of singularity theorems. I will describe a new "quantum focusing conjecture" that prevents such pathologies. In the flat spacetime limit it reduces to a novel lower bound on the energy density, which can be proven for several classes of field theories.



Mercredi fév 24, 2016


Mercredi fév 17, 2016

Precision atom interferometry is poised to become a powerful tool for discovery in fundamental physics. Towards this end, I will describe recent, record-breaking atom interferometry experiments performed in a 10-meter drop tower that demonstrate long-lived quantum superposition states with macroscopic spatial separations.



Mercredi fév 03, 2016

Radio pulsars are Nature's most perfect clock and hence are useful for precision work on a wide variety of physical and astrophysical topics, ranging from sensitive tests of relativistic gravity to constraining the equation of state of ultradense matter. I will describe current ongoing surveys for radio pulsars using the two largest radio telescopes in the world, and how these surveys are also valuable for searching for Fast Radio Bursts, a newly recognized astrophysical phenomenon of unknown origin.