Origins of the Universe Conference 2019

  • Organized by
  • Gregory Gabadadze, Ph.D.New York University
  • Eva Silverstein, Ph.D.Stanford University
  • Paul Steinhardt, Ph.D.Princeton University
  • Cumrun Vafa, Ph.D.Hollis Professor of Mathematicks and Natural Philosophy; Professor of Physics, Harvard University
Date & Time


Location

Gerald D. Fischbach Auditorium
160 5th Ave
New York, NY 10010 United States

View Map

Thur: 8:30 AM–5:10 PM
Fri: 8:30 AM–2:30 PM

Deadline to Register

Monday August 26, 2019

Participation is by invitation only. All participants must register.

The second annual meeting of the Origins of the Universe program will bring together four diverse groups of theoretical cosmologists and string theorists, each addressing the history of the universe in their own ways. The themes of the presentations and discussions will include inflationary dynamics and its observational probes, string cosmologies, bouncing and cyclic cosmologies, and other proposals for geodesically past-complete classical models.

  • Agendaplus--large

    THURSDAY, SEPTEMBER 26

    8:30 AMCHECK-IN & BREAKFAST
    9:30 AMPaul Steinhardt | A New Kind of Cycle Universe
    10:30 AMBREAK
    11:00 AMAnna Ijjas| The Virtues of Slow Contraction, and Other Perks of Bouncing
    12:00 PMLUNCH
    1:30 PMEva Silverstein | de Sitter and Large Field Inflation in String Theory
    2:30 PMBREAK
    3:00 PMRaphael Flauger | On the Robustness of Inflation to Initial Conditions
    4:00 PMBREAK
    4:30 PMGuido D'Amico | The Analysis of BOSS data with the EFTofLSS
    4:50 PMVictor Gorbenko | Holography and Correlation Functions in de Sitter
    5:10 PMDAY ONE CONCLUDES

    FRIDAY, SEPTEMBER 27

    8:30 AMCHECK-IN & BREAKFAST
    9:30 AMFrans Pretorius | Numerical Studies of Modified Gravity
    10:10 AMBREAK
    10:40 AMCumrun Vafa | Swampland and Cosmology
    11:40 PMLUNCH
    12:40 PMAndrew Tolley
    1:40 PMBREAK
    1:50 PMDavid Pirtskhalava | Early and Late Time Cosmology Beyond GR
    2:30 PMMEETING CONCLUDES
  • Abstractsplus--large

    Paul Steinhardt
    A New Kind of Cycle Universe

    The talk will explain how combining intervals of slow contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the Hubble parameter, energy density and temperature oscillate periodically, but the scale factor (and hence the size of the universe) grows by an exponential factor from one cycle to the next.
     

    Anna Ijjas
    The Virtues of Slow Contraction, and Other Perks of Bouncing

    In this talk, I will discuss the robustness of a slowly-contracting primordial epoch to initial conditions in realistic set-ups, using the full power of numerical general relativity. In addition, I will review recent progress on studying the generation of primordial perturbations as well as constructing smooth cosmological bounces.
     

    Eva Silverstein
    de Sitter and Large Field Inflation in String Theory

    In this talk I will start by reviewing models of accelerated expansion in string
    theory (both existing ones and new examples under development), explaining the methodology behind the examples and their consistency. Most stress energy sources in string theory produce positive potential energy in four dimensions, with crucial and well-known negative contributions appearing at intermediate orders in the expansion in weak coupling and large curvature radius. Localized sources contribute calculable forces in a well-defined approximation scheme, whose nature depends on the strength of the gradients in the extra dimensions. In existing models as well as new ones under development, fluxes also play a key role in stabilizing the shape of the internal geometry. These have a standard generalized form in string theory which depends on the axion fields of the theory, often resulting in large field inflation whose phenomenology depends on back reaction on the geometry which was calculated in the models. In addition to applying to early universe phenomenology, this structure led to a framework for quantum gravity in de Sitter spacetime obtained by uplifting the AdS/CFT correspondence. This dual description became significantly more complete in the past year via its relation to a generalization of the T Tbar deformation, as detailed in Gorbenko’s talk at this meeting.
     

    Raphael Flauger
    On the Robustness of Inflation to Initial Conditions

    Inflation was proposed as a solution to the horizon problem. It only provides a solution if inflation does not have a horizon problem itself. In this talk I will discuss recent analytic and numerical results about the robustness of inflation to inhomogeneities.
     

    Guido D’Amico
    The Analysis of BOSS data with the EFTofLSS

    We analyze the DR12 BOSS galaxy clustering data, using the EFTofLSS formalism. We assume ΛCDM, a fixed value of the baryon/dark-matter ratio, and of the tilt of the primordial power spectrum. After validating our technique against several sets of numerical simulations, we measure the primordial amplitude of the power spectrum, As , the abundance of matter, Ωm , and the Hubble parameter, H₀ , to about 12.4%, 3.0% and 2.9% respectively. We find ln(1010 As ) = 2.79 ± 0.12, Ωm = 0.309 ± 0.009, H₀ = 68.3 ± 2.0 km/(s Mpc) at 68% confidence level. Our results are a substantial qualitative and quantitative improvement with respect to former analyses.
     

    Victor Gorbenko
    Holography and Correlation Functions in de Sitter

    I will briefly review the existing approaches to holography for cosmological spacetimes, focusing on the dS/dS correspondence. This method relates a gravitational theory in de Sitter space to a theory in de Sitter space of lower dimension, which, in particular, allows to benefit from several novel exact results obtained in lower-dimensional quantum field theories. I will then discuss the calculations of correlation functions in cosmology with the help of stochastic differential equations as well as some properties of the wave function of the universe that these calculations highlight.
     

    Frans Pretorius
    Numerical Studies of Modified Gravity

    In this talk, I will describe some of the challenges applying modified gravity theories to scenarios that are of interest to both testing general relativity with gravitational wave observations, and to early universe cosmology. The issues can be most pronounced in the dynamical, strong-field regime, where numerical solution methods are often required. As a case study, I will describe new results on gravitational collapse and black hole formation within Einstein-dilaton-Gauss-Bonnet gravity.
     

    Cumrun Vafa
    Swampland and Cosmology

    I review some of the recent developments in the Swampland program and how it relates to cosmology. In particular I discuss how the H0 tension is reduced in the context of extensions of LCDM which are compatible with the Swampland criteria.
     

    David Pirtskhalava
    Early and Late Time Cosmology Beyond GR

    I will review proposals that aspire to describe a geodesically complete classical theory of early universe, either interpolating to inflation or replacing inflation by alternative phases. I will also review how similar theories can describe the late time cosmic acceleration of the universe.

  • Forefronts of Gravitational Physics Workshopplus--large

    Those who are attending the Forefronts of Gravitational Physics Workshop Sept 24-25, 2019 in Princeton should plan to arrive on Monday, September 23rd. Please make this selection when you register. Accommodations will be made for you in Princeton, and a shuttle will take participants to New York in the evening of September 25th.

  • Travelplus--large

    Air and Train

    Group A
    The foundation will arrange and pay for all air and train travel to the conference for those in Group A. Please provide your travel specifications by clicking the registration link above. If you are unsure of your group, please refer to your invitation sent via email.
    Group B
    The foundation will cover hotel accommodations for those in Group B. Please provide your travel specifications by clicking the registration link above. If you are unsure of your group, please refer to your invitation sent via email.
    Group C
    Individuals in Group C will not receive travel or hotel support. Please register at the link above so we can capture your dietary requirements. If you are unsure of your group, please refer to your invitation sent via email.

    Personal Car

    For participants in Groups A and B driving to Manhattan, the Roger Hotel offers valet parking. Please note there are no in-and-out privileges when using the hotel’s garage, therefore it is encouraged that participants walk or take public transportation to the Simons Foundation.
  • Hotelplus--large

    Participants in Groups A & B who require accommodations are hosted by the foundation for a maximum of three nights at The Roger hotel. Any additional nights are at the attendee’s own expense.

    The Roger New York
    131 Madison Avenue
    New York, NY 10016
    (between 30th and 31st Streets)

    To arrange accommodations, please register at the link above.

    For driving directions to The Roger, please click here.

  • Contactsplus--large

    Travel and Hotel Assistance
    Cecilia Sas, Protravel International
    simons.foundation@protravelinc.com
    646-747-9304

    Registration and General Meeting Assistance
    Emily Klein
    MPS Events Coordinator, Simons Foundation
    eklein@simonsfoundation.org
    (646) 751-1262

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