Amplitudes Meet Cosmology

Date & Time


Schloss Elmau
In Elmau 2, 82493 Krün Germany

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Registration Closed
Invitation Only

Participation is by invitation only. All participants must register.

Nima Arkani-Hamed, Institute for Advanced Study
Daniel Baumann, University of Amsterdam
John Joseph Carrasco, Northwestern University and The Institute for Theoretical Physics (IPhT, CEA-Saclay)
Daniel Green, University of California, San Diego

Cosmology is both source and arbiter of some of the biggest questions in physics, such as the origin and fate of space and time, as well as the nature and evolution of everything within it. Precise observations of the cosmic microwave background and the large-scale structure of the universe have recently brought these questions into sharp focus. Although there is growing evidence that the primordial fluctuations originated from quantum fluctuations during a period of inflation, the physics of inflation remains a mystery.

Moreover, while there have been significant theoretical advances in our understanding of cosmological correlation functions, it remains challenging to isolate fundamental physics from these correlators. In particular, we don’t know the precise rules that cosmological correlators have to obey, so that, naively, it
might seem that anything goes.

This is to be contrasted with the observation that the laws of physics are a nearly inevitable consequence of quantum mechanics and special relativity. Nowhere is this seen more clearly than in the invariant observables associated with scattering amplitudes in asymptotically flat space. If cosmology is a source of ultimate questions, scattering theory can be thought of as a source of ultimate answers. Demanding only the minimal criteria of self-consistency, scattering theory has recently discovered a variety of often radically simpler ways to frame, extract, and unify predictions from physical theories. Generalizing from the relative security of flat spacetime to confront cosmological challenges provides a spectacular opportunity to stretch the applicability and reach of the S-matrix framework’s greatest ambitions.

The Simons Symposium on Amplitudes meet Cosmology will bring experts from the cosmology and scattering amplitudes communities together, at this critical time, to share their key insights and challenges, in order to synthesize their complementary perspectives. Through a series of organized discussions, the goal of the symposium is to identify a set of precise questions against which shared progress can be measured jointly in both communities. For example, we will discuss what progress will mean in the inflationary context and how this might shape collaborations at the boundaries of both fields.


  • Agendaplus--large


    8:30 - 9:30 PMDinner at La Salle


    7:30 - 9:45 AMBreakfast at La Salle
    10:00 - 11:00 AMNima Arkani-Hamed | Amplitudes Meet Cosmology (O)*
    11:00-11:30 AMBreak
    11:30 - 12:30 PMNima Arkani-Hamed | Amplitudes Meet Cosmology (O)
    12:30 - 1:30 PMLunch at La Salle
    1:30 - 4:30 PMDiscussion & Recreation*
    4:30- 5:00 PMTea
    5:00 - 6:00 PMMatias Zaldarriaga | Cosmology Goals (O)
    6:00 - 6:15 PMBreak
    6:15 - 7:15 PMZvi Bern | Amplitudes Goals (O)
    8:00 - 9:30 PMDinner: Ganesha Restaurant in the Retreat


    7:30 - 9:45 AMBreakfast at La Salle
    10:00 - 11:00 AMDaniel Baumann | Bootstrapping Cosmology (O)
    11:00-11:30 AMBreak
    11:30 - 12:30 PMRadu Roiban | From Amplitudes to Correlators (O)
    12:30 - 1:30 PMLunch at La Salle
    1:30 - 4:30 PMDiscussion & Recreation*
    4:30- 5:00 PMTea
    5:00 - 6:00 PMJohn-Joseph Carrasco | Loops in Amplitudes and Cosmology (D)
    6:00 - 6:15 PMBreak
    6:15 - 7:15 PMAnastasia Volovich | IR Structure in Cosmology and Amplitudes (D)
    8:00 - 9:30 PMDinner


    7:30 - 9:30 AMBreakfast
    9:45 - 2:00 PMGuided Hike to Partnach Gorge
    2:00 - 3:00 PMLunch at Ganesha Restaurant in the Retreat
    3:00 - 4:30 PMRecreation & Discussion
    4:30 - 5:00 PMTea
    5:00 - 6:00 PMPaolo Benincasa & Lionel Mason | Amplitudes Beyond Flat Space (O)
    6:00 - 6:15 PMBreak
    6:15 - 7:15 PMTBA
    8:00 - 9:30 PMDinner


    7:30 - 9:45 AMBreakfast at La Salle
    10:00 - 11:00 AMTom Hartman | Insights from the Conformal Bootstrap (O)
    11:00-11:30 AMBreak
    11:30 - 12:30 PMHenrik Johansson & Donal O'Connell | Opportunities of the Double Copy (O)
    12:30 - 1:30 PMLunch at La Salle
    1:30 - 4:30 PMDiscussion & Recreation*
    4:30- 5:00 PMTea
    5:00 - 6:00 PMKurt Hinterbichler & Rachel Rosen | Sum Rules and Positivity (D)
    6:00 - 6:15 PMBreak
    6:15 - 7:15 PMYu-tin Huang & Rafael Porto | Amplitudes Meet Classical Gravity (D)
    8:00 - 9:30 PMDinner


    7:30 - 9:45 AMBreakfast at La Salle
    10:00 - 11:00 AMLiam McAllister | Challenges in De Sitter (O)
    11:00-11:30 AMBreak
    11:30 - 12:30 PMMina Arvanitaki & Dick Bond | Future Observations (O)
    12:30 - 1:30 PMLunch at La Salle
    1:30 - 4:30 PMDiscussion & Recreation*
    4:30- 5:00 PMTea
    5:00 - 6:00 PMLance Dixon | Next Steps: Amplitudes (D)
    6:00 - 6:15 PMBreak
    6:15 - 7:15 PMDaniel Green | Next Steps: Cosmology (D)
    8:00 - 9:30 PMDinner: Kaminstüberl Fondue Restaurant


    SESSIONSPavilion located at the Schloss Elmau Retreat
    MEALSLa Salle unless otherwise noted
    TEA & DISCUSSIONPavilion located at the Schloss Elmau Retreat
    EXCURSION Meet in Schloss Elmau Lobby
    SATURDAY DEPARTUREMeet in Schloss Elmau Lobby

    *Participants may explore the hotel property and its surrounding areas as well as engage in informal discussion with other participants.

  • Participantsplus--large
    Nima Arkani-HamedInstitute for Advanced Study
    Mina ArvanitakiPerimeter Institute
    Daniel BaumannUniversity of Amsterdam
    Paolo BenincasaNiels Bohr Institute
    Zvi BernUniversity of California, Los Angeles
    Dick BondCITA
    John-Joseph CarrascoNorthwestern University and The Institute for Theoretical Physics
    Lance DixonSLAC
    Daniel GreenUniversity of California, San Diego
    Tom Hartman Cornell University
    Kurt HinterbichlerCase Western Reserve University
    Yu-tin HuangNational Taiwan University
    Henrik JohanssonUppsala & Nordita
    Lionel MasonOxford University
    Liam McAllisterCornell University
    Donal O’ConnellUniversity of Edinburgh
    Enrico PajerUniversity of Cambridge
    Rafael PortoUniversity of Hamburg
    Radu RoibanPenn State University
    Rachel RosenColumbia University
    Anastasia VolovichBrown University
    Matias ZaldarriagaInstitute for Advanced Study
  • AVplus--large

    Participants will have access to a projector and screen for computer-based talks and blackboards for those who prefer to give board-based talks.

    High-speed Internet access is available.

  • Wednesday Excursionplus--large

    On Wednesday symposium activities are shortened for a guided hiking tour from Schloss-Elmau through the Partnach Gorge. The hike difficulty is moderate and will take approximately 3 hours.

    If you will participate in the hike, hiking boots or shoes appropriate for traversing rocky/wet terrain, warm clothing (e.g. a sweater), sun protection (e.g. light cap) and waterproofs (e.g. raincoat or umbrella) are strongly recommended.

    A small satchel containing a light snack and water is provided, but feel free to bring your own backpack in which to carry a camera and other items that may be useful to you.

  • Travelplus--large


    The foundation will coordinate and purchase air and train travel to the symposium. Travel specifications can be provided by clicking the registration link above.

    Participants arriving via plane will arrive via Munich International Airport (MUC) Airport.


    The closet train station to Schloss Elmau is in Klais. Those traveling by train should book their tickets directly and request reimbursement at the conclusion of the meeting. Should you require booking assistance, please contact Meghan Fazzi.

    All participants are required to arrive on Sunday prior to the meeting’s start and attend the entire week. No accommodations will be made for partial participation.


    Passports are required.

    Local Ground Transportation

    Arrival at Munich International Airport

    The foundation will arrange for your transfer from MUC airport to Schloss Elmau via a private car. After claiming your luggage at baggage claim you will proceed through customs and to the exit where a uniformed driver holding a Simons Symposia sign will greet you.

    Travel time from Munich to Schloss Elmau is 90 minutes.

    Arrival at Klais Train Station

    The foundation will arrange for your transfer from Klais train station to Schloss Elmau via a hotel shuttle.

    Travel time from Klais to Elmau is approximately 10 minutes.

    Departure from Schloss Elmau

    The day prior to your departure you will receive a departure letter advising on your departure time to the airport or train station via private car. Please meet your driver in the hotel lobby ten minutes prior to your noted departure time. If for any reason your flight departure time changes, please visit the front desk to update hotel staff.

  • Hotelplus--large

    Schloss Elmau Luxury Spa & Cultural Hideaway

    In Elmau 2, 82493 Krün
    Tel: +49 (0) 8823 18-0

    Check-in time is at 4:30 PM
    Check-out time is 11:30 AM

    Additional Night at Elmau

    The meeting concludes on Friday evening. Participants have the option to depart on Saturday following the conclusion of the meeting or depart on Sunday at no additional cost. Please note your desired departure date when registering.

    Dress Code

    Business casual clothing should be worn during the symposium.

    The weather can change very quickly; please bring cold-weather clothing appropriate for spring in the mountains.

  • Mealsplus--large

    Sunday and Saturday: Meals on arrival and departure days (including while traveling) are reimbursable by the foundation. Your meals on these days are not to exceed $115 USD.

    Monday through Friday: All meals occurring during the meeting week will be covered directly by the Simons Foundation. Participants are expected to be present for all foundation-hosted meals.

    Breakfast is served starting at 7:30 AM at La Salle restaurant. Food at La Salle is served buffet-style and is open to all hotel guests; tables are reserved for all symposium participants so that the group may dine together.

    Lunch is served daily at La Salle.

    Dinner is hosted around the hotel property at one of the restaurants. Locations are noted on the agenda.

  • Contactsplus--large

    Registration and Travel Assistance

    Christophe Vergnol, Protravel
    (973) 334-9300 ext. 10

    Meeting Questions and Assistance

    Meghan Fazzi
    Senior Executive Assistant, Simons Foundation
    (212) 524-6080

  • Reimbursement and Travel Policyplus--large


    Any expenses not directly paid for by the Simons Foundation are subject to reimbursement based on the travel policy. Please review the policy and complete when submitting your expenses. Receipts are required for any expenses over $50 USD and are due within THIRTY DAYS (30) after the conclusion of the symposium. All expenses are reconciled through the foundation’s online reimbursement platform. Additional information regarding reimbursement is sent via email on the final day of the symposium.

    Should you have any questions, please contact Meghan Fazzi.

    Guest Policy

    It is the foundation’s policy to discourage spouses, families or others from joining participants during the meeting. Participants who choose to invite guests to come before or stay on after the meeting do so at their own expense. The Simons Foundation will not cover expenses associated with such extensions.

    Additional Nights

    Should you decide to extend your stay, Schloss Elmau will honor the conference rate of €337.50/night for up to two nights. Any nights beyond those associated with the conference are not reimbursable by the foundation.

    Please note on your registration form if you wish to extend your stay.

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