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Celestial meets de Sitter holography

16–20 Jun 2025
Villa Orlandi, Capri
Europe/Rome timezone

Session

Topical Seminars

16 Jun 2025, 14:00
Villa Orlandi, Capri

Villa Orlandi, Capri

Via Finestrale, 2, 80071 Anacapri NA

Presentation materials

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  1. 1. Celestial CFT data: w-(1+infty) and beyond
    Andrea Puhm
    16/06/2025, 14:00
  2. 2. High-energy string theory and celestial holography
    Stephan Stieberger
    16/06/2025, 14:30

    In my talk I make connection between two seemingly unrelated topics: (a) the high energy limit of string theory (more specifically, the high energy (zero tension) limit of tree-level string scattering in flat backgrounds) and its subleading corrections as saddle-point approximation on the string world-sheet, (b) the infinite energy limit of celestial string amplitudes as stationary phase...

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  3. 3. Soft Algebras in AdS4 and dS4
    Andrew Strominger
    16/06/2025, 15:30
  4. 4. Carrollian Amplitudes and Holographic Correlators in AdS3/CFT2
    Bin Zhu
    16/06/2025, 16:00

    With the new notions of flat holography introduced in recent years, there has been increased interest in relating the new formalisms to the flat space limit of AdS/CFT. We study Carrollian amplitudes of massless scalars in (1+2) Minkowski space. Using the prescription recently shown by Alday et al. [1] originally designed for the AdS4 Witten diagrams, we show that AdS3 Witten diagrams in...

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  5. 6. Hartle-Hawking revisited
    Jordan Cotler
    17/06/2025, 14:00

    By leveraging recent insights on de Sitter holography from low-dimensional gravity, we study basic properties of the quantum mechanics of the Hartle-Hawking wavefunction in general dimensions. We highlight connections to basic puzzles in de Sitter quantum gravity.

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  6. 5. Finite boundaries meet all-Lambda’s holography
    Damián Galante
    17/06/2025, 14:30

    I will describe recent progress in trying to understand the theory of general relativity in manifolds with finite boundaries and comment on possible holographic applications, in principle valid for any value of the cosmological constant.

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  7. 8. Insights from exact results in dS
    Alan Rios Fukelman
    17/06/2025, 15:30

    In this talk I will present an exactly solvable theory on a fixed de Sitter spacetime that can be analyzed efficiently using Euclidean methods. I will then discuss the fully non-perturbative, all loop correlation function of gauge invariant operators and demonstrate many features endemic of quantum field theory in de Sitter space such as the appearance of late-time logarithm and their...

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  8. 7. TBA
    Tarek Anous
    17/06/2025, 16:00
  9. 13. Infrared structure of gravitational scattering up to quadrupolar order
    Geoffrey Compère
    19/06/2025, 14:00

    Asymptotically flat spacetimes have been defined from consistently matching their five infinities such that they share a single BMS group of asymptotic symmetries and associated charges. We propose a consistent subleading and subsubleading structure which is covariant under the BMS group. At subleading order, we identify three conservation laws: tails are conserved between past and future null...

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  10. 14. (Anti-) de Sitter deformations of celestial symmetries and their twistor origin
    Lionel Mason
    19/06/2025, 14:30

    This talk will review the twistor origins of celestial symmetry algebras and their deformations/extension to (A)dS. It will go on to discuss their origin as Hamiltonians via twistor actions and connections with the integral systems literature and top down approaches to celestial holography. This is partly based on joint work with Bittleston, Bogna, Kmec & Skinner arxiv:2403.18011 and with...

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  11. 15. On the mixed helicity sector of celestial symmetries
    Daniele Pranzetti
    19/06/2025, 15:30

    The mixed helicity sector of celestial symmetries has been largely unexplored so far. I will report on recent progress in expressing the mixed helicity charge bracket for gravity and YM theory in a closed form, revealing the key role played by the shadow transformation. The correspondence between the hard charge action on conformal primary fields and the celestial OPE provides consistency...

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  12. 16. TBA
    David Skinner
    19/06/2025, 16:00
  13. 9. A geometrical picture for processes in expanding universes
    Paolo Benincasa
    20/06/2025, 14:00

    I present a first principle definition of the Bunch-Davies
    wavefunctional in perturbation theory for generic scalars in arbitrary
    FRW cosmologies. This novel picture generalises the original
    description of conformally-coupled and light states in terms of
    (generalised) cosmological polytopes. I'll comment on the insights that
    it provides on the analytic structure of such an observables,...

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  14. 10. TBA
    Austin Joyce
    20/06/2025, 14:30
  15. 11. A few basic facts about de Sitter and Anti-de Sitter quantum field theory and some of their applications
    Ugo Moschella
    20/06/2025, 15:30

    A will discuss a general covariant approach to dS and AdS QFT based on plane waves and the global analyticity properties of the correlation functions. I will also sketch some recent results including the exact calculation of one and two-loop diagrams

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  16. 12. Twistors and Spin in cosmology
    Guilherme Pimentel
    20/06/2025, 16:00

    I will describe how twistors are the natural language to describe massless particles with spin in de Sitter space, and illustrate the formalism with some examples.

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