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# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.  Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

## Inspiral Tests of Strong-field Gravity and Ringdown Tests of Quantum Black Holes

Mercredi nov 08, 2017
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The binary black hole merger events recently discovered by the LIGO and Virgo Collaboration offer us excellent testbeds for exploring extreme (strong and dynamical-field) gravity that was previously inaccessible. In this talk, I will first explain the current status of probing fundamental pillars of General Relativity using the inspiral part of the gravitational waveform. I will next describe how well one can constrain one type of quantum black holes, collapsed polymers, with the GW150914 ringdown. I will conclude with a list of important open problems.

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## Operational General Relativity - Lecture 4

Mercredi nov 08, 2017
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## Discussion: Evidence for Echoes

Mercredi nov 08, 2017

## An alternative significance estimation for the evidence for echoes

Mercredi nov 08, 2017
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The noise dominated nature of the gravitational wave detectors requires an assessment of the noise background in the search for astrophysical signals. Starting with a frequentist approach, the original analysis used about 16 seconds of data after the merger signal to find how frequently random noise mimics the expected signal. We present the results of extending the background estimation to 4096 seconds of public LIGO data and discuss the concerns arising from subtleties in the analysis for the long and self-similar echo templates.

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## PSI 17/18 - Condensed Matter - Lecture 3

Mercredi nov 08, 2017
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## A model-independent search for gravitational-wave echoes

Mercredi nov 08, 2017
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Exotic compact objects (e.g. boson stars, dark matter stars, gravastars), and certain quantum modifications to black holes (e.g. firewalls) are speculated to give out echoes'' or bursts of radiation appearing at regular time intervals due to a perturbation by any infalling matter or field. In particular, these echoes are also expected to appear soon after their formation.

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## Improvements on the methods for searching echoes

Mercredi nov 08, 2017
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The recent detections of merging black holes allow for observational tests of the nature of these objects, such as searching for the GW echo signals proposed in some models. Tentative evidence for these was presented, found in an analysis based upon methods for GW data analysis as demonstrated on the Ligo Open Science Center. We present the results of characterising these method's behaviour when applied to the specific form of the echo signals, and address problems and improvements based on our findings.

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## Echoes from the Abyss: Tentative Evidence for Planck-Scale Structure at Black Hole Horizons

Mercredi nov 08, 2017
Speaker(s):

In classical General Relativity (GR), an observer falling into an astrophysical black hole is not expected to experience anything dramatic as she crosses the event horizon. However, tentative resolutions to problems in quantum gravity, such as the cosmological constant problem, or the black hole information paradox, invoke significant departures from classicality in the vicinity of the horizon. It was recently pointed out that such near-horizon structures can lead to late-time echoes in the black hole merger gravitational wave signals that are otherwise indistinguishable from GR.

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## PSI 17/18 - Quantum Field Theory II - Lecture 3

Mercredi nov 08, 2017
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## Quantifying the evidence for black holes with GW and EM probes

Mercredi nov 08, 2017
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## Next Public Lecture

Check back for details on the next lecture in Perimeter's Public Lectures Series