Cosmological Correlators

Name: Cosmological Correlators
Start: 2020-09-07T10:00:00+02:00
End: 2020-09-09T21:15:00+02:00
Location: CERN

7–9 Sept 2020

CERN

Europe/Zurich timezone

Dr Enrico Pajer and Guilherme Pimentel

Contribution List

31. Introductory Remarks

Dr Enrico Pajer (University of Cambridge), Guilherme Pimentel

07/09/2020, 12:00

1. Live Talk 1: Building a Boostless Bootstrap [Enrico Pajer]

07/09/2020, 14:00

Abstract: Cosmological surveys are believed to measure the future value of quantum correlators in a theory of gravity around quasi de Sitter spacetime. The goal of this talk is to develop a cosmological bootstrap, namely understand how general physical principles such as unitarity, locality and symmetries are encoded in these observables without a reference to the unobservable time evolution...

24. Discussion of talks [Guilherme Pimentel]

07/09/2020, 15:00

Harry Goodhew: The cosmological Optical Theorem
Dong-Gang Wang: Excursion in curved field space
Giovanni Cabass: Graviton non-Gaussianity in the EFT of I
Toshifumi Noumi: Country map of the EFT landscape

18. Live Talk 2: Multipoint Correlators in Multifield Cosmology: formal structure and applications [Eva Silverstein]

07/09/2020, 16:00

Abstract: Connected N-point amplitudes in quantum field theory are enhanced by a factor of N! in appropriate regimes of kinematics and couplings, but the non-perturbative analysis of this for collider physics applications is subtle. We will start by briefly reviewing this effect and related developments in large-charge sectors of quantum field theory. We then resolve the question in the...

25. Discussion of talks [Austin Joyce]

07/09/2020, 17:00

Spyros Sypsas: Primordial statistics from Multifields
Siyi Zhou: Classical String solutions on dS
Leonardo Senatore: Starting inflation from inhomogeneous universe
Kurt Hinterbichler: Shift symmetries on dS

7. Discussion day 1 [Paolo Creminelli]

07/09/2020, 18:00

19. Live Talk 3: Spinning Cosmological Bootstrap [Hayden Lee]

08/09/2020, 14:00

Abstract: In this talk, I will describe recent developments in the bootstrap approach to cosmological correlators, extended to correlators of massless spinning particles. Interactions of massless particles are highly constrained by gauge invariance, which manifests itself as current conservation on the boundary of de Sitter space. I will show that boundary spinning correlators satisfy current...

26. Discussion of talks [Paul McFadden]

08/09/2020, 15:00

Austin Joyce: Spinning correlators from the boundary
Carlos Duaso Pueyo: Weight-shifting operators
Paul McFadden: Conformal correlators as simplex in momentum space
Aaron Hilmann: Symbols in the Sky

20. Live Talk 4: Steinmann Relations, Causality and the Wavefunction of the Universe [Paolo Benincasa]

08/09/2020, 16:00

Abstract: How consistent causal time evolution is encoded in the late
time wavefuntions of the universe or correlation functions? This is one
of the open question which is crucial for our understanding of the
fundamental physics encoded in quantum mechanical observables in
cosmology. In this talk I will report on a recent progress in addressing
such a question showing how the wavefunction...

27. Discussion of talks [Leonardo Senatore]

08/09/2020, 17:00

Dmitri Ponomarev: Spinor helicity formalism in AdS
Hiroshi Isono: Cosmological Witten diagrams
Yasha Neiman: Scattering amplitudes for dS observers
Massimo Taronna: From CFT bootstrap to correlators

2. Discussion day 2 [Kostas Skenderis]

08/09/2020, 18:00

22. Live Talk 5: Alternatives to inflation as cosmological particle scanners [Xingang Chen]

09/09/2020, 14:00

Abstract: We show that, while inflation can be regarded as a cosmological collider with fixed energy, possible alternative scenarios to inflation may be viewed as particle detectors with scanning energies. They scan through a tower of massive particles in the primordial universe and leave a series of bursts of oscillatory signals as scale-dependent features in the density perturbations....

29. Discussion of talks [Daniel Green]

09/09/2020, 15:00

Yi Wang: Non-standard quantum clocks
Soubhik Kumar: extending the read of the Cosmo Collider
Mark Wise: Galaxy Bispectrum and Conformal Fermi Coordinates
Sebastien Reneaux-Petel: A manifestly covariant theory of multifield stochastic inflation

23. Live Talk 6: De Sitter Diagrammar and the Resummation of Time [Matthew Baumgart]

09/09/2020, 16:00

Abstract: Light scalars in inflationary spacetimes suffer from infrared logarithmic divergences at every order in perturbation theory. This corresponds to the scalar field values in different Hubble patches undergoing a random walk of quantum fluctuations, leading to a simple toy ``landscape'' on superhorizon scales, in which we can explore questions relevant to eternal inflation. However,...

28. Discussion of talks [Garrett Goon]

09/09/2020, 17:00

Dan Green: Soft dS EFT
Victor Gorbenko: IR dynamics of QFT in dS
Mehrdad Mirbabayi: Loss of memory in dS
Skenderis: Inflationary correlators and the solution of conformal Ward identities
Bzowski: TripleK: A Mathematica package for evaluating triple-K integrals and conformal correlation functions

8. Discussion [Nima Arkani-Hamed]

09/09/2020, 18:00

9. Conclusion

09/09/2020, 19:00

37. A manifestly covariant theory of multifield stochastic inflation

Sebastien Renaux-Petel

Recorded Talks

34. Classical string solutions on de Sitter space

Ms Siyi Zhou

Recorded Talks

38. Conformal correlators as simplex integrals in momentum space

Paul McFadden (Newcastle University)