Conference

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UV complete 4-derivative scalar field theory

Bob Holdom
University of Toronto
October 24, 2023

PIRSA:23100006
Quantum Gravity
CDT as computational gateway to nonperturbative quantum gravity

Renate Loll
Radboud Universiteit Nijmegen
October 24, 2023

PIRSA:23100062
Quantum Gravity
Status, perspective and three challenges in the asymptotic-safety paradigm for quantum gravity - VIRTUAL

Astrid Eichhorn
University of Southern Denmark
October 24, 2023

PIRSA:23100005
Quantum Gravity
Panel Discussion - Strengths and limitations of EFT (Donoghue, Knorr, Montero, Quevedo, Tolley)
- John Donoghue
  University of Massachusetts Amherst
- Miguel Mlontero
  IFT Madrid
- Fernando Quevedo
  University of Cambridge
- Carlo Rovelli
  Aix-Marseille University
- Andrew Tolley
  Imperial College London
October 23, 2023

PIRSA:23100004
Quantum Gravity
Open Discussion with today's speakers (Donoghue, Erdmenger, Montero, Pasterski, Tolley)
- John Donoghue
  University of Massachusetts Amherst
- Johanna Erdmenger
  University of Würzburg
- Miguel Mlontero
  IFT Madrid
- Sabrina Pasterski
  Perimeter Institute for Theoretical Physics
- Andrew Tolley
  Imperial College London
October 23, 2023

PIRSA:23100003
Quantum Gravity
Piecing Together a Flat Hologram

Sabrina Pasterski
Perimeter Institute for Theoretical Physics
October 23, 2023

PIRSA:23100061
Quantum Gravity
A hike through the Swamp

Miguel Mlontero
IFT Madrid
October 23, 2023

PIRSA:23100002
Quantum Gravity
Holography and its implications for quantum gravity - VIRTUAL

Johanna Erdmenger
University of Würzburg
October 23, 2023

PIRSA:23100060
Quantum Gravity
Positivity Bounds and Effective Fields Theories (A Review)

Andrew Tolley
Imperial College London
October 23, 2023

PIRSA:23100059
Quantum Gravity
Lessons of the Effective Field Theory Treatment of General Relativity

John Donoghue
University of Massachusetts Amherst
October 23, 2023

PIRSA:23100058
Quantum Gravity
QPV and Geometry of Banach spaces

David Perez-Garcia
Universidad Complutense de Madrid
September 21, 2023

PIRSA:23090012
Quantum Information
Making Existing Quantum Position Verification Protocols Secure Against Arbitrary Transmission Loss

Andreas Bluhm
Laboratoire d'Informatique de Grenoble
September 21, 2023

PIRSA:23090022
Quantum Information

UV complete 4-derivative scalar field theory

Bob Holdom
University of Toronto
October 24, 2023

PIRSA:23100006
Quantum Gravity
A scalar field theory with 4-derivative kinetic terms and 4-derivative cubic and quartic couplings is presented as a proxy for quadratic gravity. Unitarity and positivity appear as the key issues in the scalar field theory, just as they do in quadratic gravity. We have extended some calculations to show how these issues are resolved in the high energy limit of the theory. The results also show how it is that differential cross sections can have good high energy behaviour.
CDT as computational gateway to nonperturbative quantum gravity

Renate Loll
Radboud Universiteit Nijmegen
October 24, 2023

PIRSA:23100062
Quantum Gravity
Based on quantitative results on quantum observables in a Planckian regime, I will argue that using dynamical lattices `a la CDT to construct and explore the nonperturbative path integral over Lorentzian geometries is a bona-fide quantum field-theoretic "method" rather than an "approach" to quantum gravity. Its most important features are universality, unitarity and the presence of powerful numerical tools to directly simulate and measure a chunk of quantum spacetime of about 20 Planck lengths across. This small observational window is a preferred place to look for clues to what quantum gravity is all about. Despite the diffeomorphism-invariant and nonlocal character of the observables, qualitatively new and surprising UV properties have already been discovered, and compatibility checks with semiclassical expectations for several cosmological observables ("classical limit") have been performed successfully. The underlying new mathematics is that of random geometry and beyond-Riemannian geometry.
Status, perspective and three challenges in the asymptotic-safety paradigm for quantum gravity - VIRTUAL

Astrid Eichhorn
University of Southern Denmark
October 24, 2023

PIRSA:23100005
Quantum Gravity
In my talk, I'll review the key idea underlying asymptotically safe quantum gravity, before giving an overview of the current status and open questions. I'll then spotlight three challenges. The first challenge is how to test quantum gravity and I'll advocate that by linking quantum gravity to particle physics and cosmology, we can probe quantum gravity at all scales. The second challenge is how to connect to other ideas about quantum spacetime and I'll discuss effective asymptotic safety as a way to link to, e.g., string theory. The third challenge is the status of global symmetries and I'll discuss what we know about the preservation of global symmetries in asymptotic safety and what this implies for a broader perspective on the question. --- The presenter will be joining via Zoom for this talk.
Panel Discussion - Strengths and limitations of EFT (Donoghue, Knorr, Montero, Quevedo, Tolley)
- John Donoghue
  University of Massachusetts Amherst
- Miguel Mlontero
  IFT Madrid
- Fernando Quevedo
  University of Cambridge
- Carlo Rovelli
  Aix-Marseille University
- Andrew Tolley
  Imperial College London
October 23, 2023

PIRSA:23100004
Quantum Gravity
Open Discussion with today's speakers (Donoghue, Erdmenger, Montero, Pasterski, Tolley)
- John Donoghue
  University of Massachusetts Amherst
- Johanna Erdmenger
  University of Würzburg
- Miguel Mlontero
  IFT Madrid
- Sabrina Pasterski
  Perimeter Institute for Theoretical Physics
- Andrew Tolley
  Imperial College London
October 23, 2023

PIRSA:23100003
Quantum Gravity
Piecing Together a Flat Hologram

Sabrina Pasterski
Perimeter Institute for Theoretical Physics
October 23, 2023

PIRSA:23100061
Quantum Gravity
The Celestial Holography program encompasses recent efforts to understand the flat space hologram in terms of a CFT living on the celestial sphere. A key development instigating these efforts came from understanding how soft limits of scattering encode infinite dimensional symmetry enhancements corresponding to the asymptotic symmetry group of the bulk spacetime. Historically, the construction of the bulk-boundary dual pair has followed bottom up approach matching symmetries on both sides. Recently, however, there has been exciting progress in formulating top down descriptions using insights from twisted holography. We review salient aspects of the celestial construction, the status of the dictionary, and active research directions.
A hike through the Swamp

Miguel Mlontero
IFT Madrid
October 23, 2023

PIRSA:23100002
Quantum Gravity
At first sight, it seems that almost any QFT, seen as a low-energy effective field theory (EFT), can be coupled to gravity -- simply add an Einstein-Hilbert term, change all derivatives by covariant ones, and you're done. However, a growing body of evidence coming from String Theory compactifications, general properties of black hole evaporation, and rigorous results in holography, suggests that the opposite is true. We can work out the hidden constraints that quantum gravity consistency imposes in the matter sector systematically, an approach that receives the colourful name of "The Swampland Program". I will briefly review the program, its motivation, current results, and long-term goals.
Holography and its implications for quantum gravity - VIRTUAL

Johanna Erdmenger
University of Würzburg
October 23, 2023

PIRSA:23100060
Quantum Gravity
I will review implications of the AdS/CFT correspondence for quantum gravity, paying particular attention to holographic RG flows and the processing of information. Deformed hyperbolic geometries correspond to boundary field theory RG flows. Conversely, as I will exemplify using the recent approach of discrete holography, boundary RG flows may be used to reconstruct the bulk spacetime, for instance via tensor networks. I will discuss recent approaches towards including gravity dynamics into this reconstruction process. --- The presenter will be joining via Zoom for this talk.
Positivity Bounds and Effective Fields Theories (A Review)

Andrew Tolley
Imperial College London
October 23, 2023

PIRSA:23100059
Quantum Gravity
I will briefly review recent progress on how causality/analyticity and unitarity can put powerful constraints on both gravitational and non-gravitational EFTs that admit consistent UV completions.
Lessons of the Effective Field Theory Treatment of General Relativity

John Donoghue
University of Massachusetts Amherst
October 23, 2023

PIRSA:23100058
Quantum Gravity
I will briefly review the key concepts underlying the Effective Field Theory of General Relativity, and give a couple of examples of how it works. Then I will describe seven lessons which can be extracted from the theory. Finally I discuss some of the limitations of the EFT framework.
QPV and Geometry of Banach spaces

David Perez-Garcia
Universidad Complutense de Madrid
September 21, 2023

PIRSA:23090012
Quantum Information
Making Existing Quantum Position Verification Protocols Secure Against Arbitrary Transmission Loss

Andreas Bluhm
Laboratoire d'Informatique de Grenoble
September 21, 2023

PIRSA:23090022
Quantum Information

Title	Speaker(s)	Date	Talk Type	Info link
UV complete 4-derivative scalar field theory	Bob Holdom	2023-10-24	Conference	View details
CDT as computational gateway to nonperturbative quantum gravity	Renate Loll	2023-10-24	Conference	View details
Status, perspective and three challenges in the asymptotic-safety paradigm for quantum gravity - VIRTUAL	Astrid Eichhorn	2023-10-24	Conference	View details
Panel Discussion - Strengths and limitations of EFT (Donoghue, Knorr, Montero, Quevedo, Tolley)	John Donoghue, Miguel Mlontero, Fernando Quevedo, Carlo Rovelli, Andrew Tolley	2023-10-23	Conference	View details
Open Discussion with today's speakers (Donoghue, Erdmenger, Montero, Pasterski, Tolley)	John Donoghue, Johanna Erdmenger, Miguel Mlontero, Sabrina Pasterski, Andrew Tolley	2023-10-23	Conference	View details
Piecing Together a Flat Hologram	Sabrina Pasterski	2023-10-23	Conference	View details
A hike through the Swamp	Miguel Mlontero	2023-10-23	Conference	View details
Holography and its implications for quantum gravity - VIRTUAL	Johanna Erdmenger	2023-10-23	Conference	View details
Positivity Bounds and Effective Fields Theories (A Review)	Andrew Tolley	2023-10-23	Conference	View details
Lessons of the Effective Field Theory Treatment of General Relativity	John Donoghue	2023-10-23	Conference	View details
QPV and Geometry of Banach spaces	David Perez-Garcia	2023-09-21	Conference	View details
Making Existing Quantum Position Verification Protocols Secure Against Arbitrary Transmission Loss	Andreas Bluhm	2023-09-21	Conference	View details

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