Workshop on Fundamental Aspects of String Theory

June 1-12, 2020

São Paulo, Brazil

ICTP-SAIFR/IFT-UNESP

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Due to COVID-19, the workshop will be held online and links to the videoconference will be available on this webpage. Pdf files and videos will also be posted on this webpage after each lecture. For online discussions, there is a Slack webpage

For any questions on using the Slack webpage, send an email to tsi.fleury AT gmail.com

Zoom link to 2020 Workshop on String Field Theory and Related Aspects (www.zoom.us/join) ID: 971 7326 6763 Password: 469542

For any questions on connecting to the zoom link, send an email to thiago AT ictp.saifr.org

Week 1: Mini-course of four lectures by Ashoke Sen on “D-Instanton Perturbation Theory”

Monday June 1 – Thursday June 4,  10:00 – 11:30 am in São Paulo (9:00-10:30 am in NY, 15:00 – 16:30 CET)

Abstract: World-sheet approaches to computing amplitudes in string theory often lead to divergent results that need to be defined by analytically continuing the external momenta. This procedure breaks down for amplitudes in the presence of D-instantons since open strings on the D-instanton do not carry any continuous momenta and therefore the divergences cannot be avoided by deforming the external momenta. In these lectures we shall show how string field theory leads to an unambiguous procedure for evaluating these amplitudes. We shall not assume any prior knowledge of string field theory, but will assume knowledge of world-sheet formulation of string theory, including the b,c ghost system.

 

Week 2:  2020 Workshop on String Field Theory and Related Aspects

Monday June 8 – Friday June 12, 9:00 – 13:00 in São Paulo (8:00 – noon in NY, 14:00 – 18:00 CET)

This is the 12th version of an annual workshop held in previous years in Italy (2019), India (2018), Israel (2017), Brasil (2016), China (2015), Italy (2014), Israel (2012), Czechia (2011), Japan (2010), Russia (2009) and Germany (2008).

There is no registration fee and all lectures will be broadcast live. This workshop is jointly organized with the International Institute of Physics in Natal.

 

Organizers:

  • Nathan Berkovits  (ICTP-SAIFR/IFT-UNESP, Brazil)
  • Ted Erler (ACSR, Prague, Czech Republic)
  • Thiago Fleury (IIP-UFRN, Brazil)
  • Carlo Maccaferri (Turin University and INFN, Italy)
  • Yuji Okawa (Tokyo University Komaba, Japan)
  • Martin Schnabl (Charles University – Prague, Czech Republic)
  • Ashoke Sen (Harish-Chandra Research Institute, India)
  • Brenno Vallilo (Univ. Andres Bello, Chile)
  • Barton Zwiebach (MIT, USA)

Speakers and Titles

  • Tim Adamo (Edinburgh University, UK) Scattering in chiral strong backgrounds
  • Eduardo Casali (UC-Davis, QMAP, USA) Higher genus monodromy relations and color-kinematics
  • Subhroneel Chakrabarti (IMSc, Chennai and HBNI-Mumbai, India) Scattering of massive states in pure spinor formalism
  • Osvaldo Chandia (Universidade Adolfo Ibáñez, Chile) The pure spinor b ghost in curved backgrounds
  • Kevin Costello (Perimeter Institute, Canada) The Green- Schwarz string from 4d Chern-Simons
  • Harold Erbin (Turin University, Alessandria and INFN, Italy) Algebraic structures of effective string field theory
  • Ted Erler (ACSR Prague, Czech Republic) Mapping between Witten and lightcone SFTs
  • Yvonne Geyer (Chulalongkorn University, Thailand) – Twistorial ambitwistor-strings: 2. Amplitude formulae
  • Nobuyuki Ishibashi (Tsukuba University, Japan) SFT for noncritical strings revisited
  • Renann Lipinski Jusinskas (Institute of Physics-Prague, Czech Republic) Chiral strings, the sectorized description and their integrated vertex operators
  • Hiroshige Kajiura (Chiba University, Japan) Wondering about an open-closed correspondence
  • Sitender Kashyap (Harish-Chandra Research Institute, India) Construction of covariant vertex operators in the pure spinor formalism
  • Shota Komatsu (IAS Princeton, USA) The boundary state from Wilson loops
  • Matej Kudrna (Institute of Physics-Prague, Czech Republic) SU(2) WZW model solutions in OSFT
  • Hiroshi Kunitomo (Kyoto University and Yukawa Institute, Japan) Tree-level S-matrix of superstring field theory
  • Alok Laddha (Chennai Math Institute, India) Dissection quivers, polytopes and scattering amplitudes
  • Carlo Maccaferri (Turin University and INFN, Italy) Classical solutions and background independence in OSFT
  • Lionel Mason (Oxford University, UK) Twistorial  ambitwistor-strings: 1.Models
  • Toru Masuda (ASCR-Prague, Czech Republic) 1/K in open string field theory
  • Hiroaki Matsunaga (Institute of Physics and ASCR-Prague, Czech Republic) Path-integral and quantum A_infinity structure of quantum field theory
  • Anupam Mazumdar (Groningen University, the Netherlands) Resolution of singularities in infinite derivative gravity
  • Ruggero Noris (Turin Polytechnic and INFN, Italy) A simple solution for static backgrounds in cubic superstring field theory
  • Yuji Okawa (Tokyo University Komaba, Japan) Gauge-invariant operators of open bosonic string field theory in the low-energy limit
  • Leonardo Rastelli (YITP-Stony Brook, USA) Maximally supersymmetric RG flows in 4D and integrability
  • Ivo Sachs (Munich University-LMU, Germany) Type II SUGRA from the spinning world line
  • Lorenz Schlechter (Max Planck Institute-Munich, Germany) Bosonic string tachyon potentials from the N=1 point of view
  • Oliver Schlotterer (Uppsala University, Sweden) Towards bases of worldsheet integrals for string amplitudes
  • Albert Schwarz (University of California at Davis, USA) Scattering matrix and inclusive scattering matrix in QFT and string field theory
  • Ashoke Sen (Harish-Chandra Research Institute, India) Divergent to complex amplitudes in two-dimensional string theory
  • Jim Stasheff (North Carolina University, USA) Gauge field theory: deformations, obstructions and higher structure
  • Mritunjay Verma (INFN-Naples and Naples University, Italy) Open-closed superstring field theory
  • Jakub Vosmera (Institute of Physics and Charles University, Prague, Czech Republic) New results on localizing SFT effective actions
  • Xi Yin (Harvard University, USA) D-instanton calculus in c=1 string theory
  • Barton Zwiebach (MIT, USA) Hyperbolic string vértices

 

Timetable

Program for string field theory workshop (SP is time in São Paulo, EST is time in New York and CET is time in Paris):

Monday June 8

Bosonic string field theory

9:00 SP (8:00 EST, 14:00 CET) Yuji Okawa – Gauge-invariant operators of open bosonic string field theory in the low-energy limit

9:30 SP (8:30 EST, 14:30 CET) Hiroshige Kajiura – Wondering about an open-closed correspondence

10:00 SP (9:00 EST, 15:00 CET) Hiroaki Matsunaga – Path-integral and quantum A_infinity structure of quantum field theory

10:30 SP (9:30 EST, 15:30 CET) Coffee break/General discussion

10:45 SP (9:45 EST, 15:45 CET) Ted Erler – Mapping between Witten and lightcone SFTs

11:15 SP (10:15 EST, 16:15 CET) Harold Erbin  –  Algebraic structures of effective string field theory

11:45 SP (10:45 EST, 16:45 CET) Coffee break/General discussion

12:00 SP (11:00 EST, 17:00 CET) Matej Kudrna – SU(2) WZW model solutions in OSFT

12:30 SP (11:30 EST, 17:30 CET) Jim Stasheff – Gauge field theory: deformations, obstructions and higher structure

 

Tuesday June 9

Bosonic and superstring field theory

9:00 SP (8:00 EST, 14:00 CET) Hiroshi Kunitomo – Tree-level S-matrix of superstring field theory

9:30 SP (8:30 EST, 14:30 CET) Carlo Maccaferri – Classical solutions and background independence in OSFT

10:00 SP (9:00 EST, 15:00 CET) Jakub Vosmera – New results on localizing SFT effective actions

10:30 SP (9:30 EST, 15:30 CET) Coffee break/General discussion

10:45 SP (9:45 EST, 15:45 CET) Nobuyuki Ishibashi – SFT for noncritical strings revisited

11:15 SP (10:15 EST, 16:15 CET) Barton Zwiebach – Hyperbolic string vértices

11:45 SP (10:45 EST, 16:45 CET) Coffee break/General discussion

12:00 SP (11:00 EST, 17:00 CET) Mritunjay Verma – Open-closed superstring field theory

12:30 SP (11:30 EST, 17:30 CET) Ruggero Noris – A simple solution for static backgrounds in cubic superstring field theory

 

Wednesday June 10

String field theory applications

9:00 SP (8:00 EST, 14:00 CET) Toru Masuda – 1/K in open string field theory

9:30 SP (8:30 EST, 14:30 CET) Ivo Sachs – Type II SUGRA from the spinning world line

10:00 SP (9:00 EST, 15:00 CET) General discussion on diversity

10:30 SP (9:30 EST, 15:30 CET)  Coffee break/General discussion

10:45 SP (9:45 EST, 15:45 CET) Anupam Mazumdar – Resolution of singularities in infinite derivative gravity

11:15 SP (10:15 EST, 16:15 CET) Lorenz Schlechter – Bosonic string tachyon potentials from the N=1 point of view

11:45 SP (10:45 EST, 16:45 CET) Coffee break/General discussion

12:00 SP (11:00 EST, 17:00 CET) Kevin Costello – The Green- Schwarz string from 4d Chern-Simons

12:30 SP (11:30 EST, 17:30 CET) Eduardo Casali – Higher genus monodromy relations and color-kinematics

13:00 SP (12:00 EST, 18:00 CET) Informal discussion (unrecorded)

 

Thursday June 11

Scattering amplitudes

8:40 SP (7:40 EST, 13:40 CET) Informal discussion (unrecorded)

9:00 SP (8:00 EST, 14:00 CET) Alak Laddha – Dissection quivers, polytopes and scattering amplitudes

9:30 SP (8:30 EST, 14:30 CET) Oliver Schlotterer – Towards bases of worldsheet integrals for string amplitudes

10:00 SP (9:00 EST, 15:00 CET) Leonardo Rastelli – Maximally supersymmetric RG flows in 4D and integrability

10:30 SP (9:30 EST, 15:30 CET)  Coffee break/General discussion

10:45 SP (9:45 EST, 15:45 CET) Shota Komatsu – The boundary state from Wilson loops

11:15 SP (10:15 EST, 16:15 CET) Xi Yin – D-instanton calculus in c=1 string theory

11:45 SP (10:45 EST, 16:45 CET) Coffee break/General discussion

12:00 SP (11:00 EST, 17:00 CET) Ashoke Sen – Divergent to complex amplitudes in two-dimensional string theory

12:30 SP (11:30 EST, 17:30 CET) Albert Schwarz – Scattering matrix and inclusive scattering matrix in QFT and string field theory

13:00 SP (12:00 EST, 18:00 CET) Informal discussion (unrecorded)

 

 

Friday June 12

Ambitwistors and pure spinors

8:40 SP (7:40 EST, 13:40 CET) Informal discussion (unrecorded)

9:00 SP (8:00 EST, 14:00 CET) Lionel Mason – Twistorial  ambitwistor-strings: 1.Models

9:30 SP (8:30 EST, 14:30 CET) Yvonne Geyer – Twistorial ambitwistor-strings: 2. Amplitude formulae

10:00 SP (9:00 EST, 15:00 CET) Subhroneel Chakrabarti – Scattering of massive states in pure spinor formalism

10:30 SP (9:30 EST, 15:30 CET)  Coffee break/General discussion

10:45 SP (9:45 EST, 15:45 CET) Sitender Pratap Kashyap – Construction of covariant vertex operators in the pure spinor formalism

11:15 SP (10:15 EST, 16:15 CET)  Osvaldo Chandia – The pure spinor b ghost in curved backgrounds

11:45 SP (10:45 EST, 16:45 CET) Coffee break/General discussion

12:00 SP (11:00 EST, 17:00 CET) Tim Adamo – Scattering in chiral strong backgrounds

12:30 SP (11:30 EST, 17:30 CET) Renann Lipinski Jusinskas – Chiral strings, the sectorized description and their integrated vertex operators

13:00 SP (12:00 EST, 18:00 CET) Informal discussion (unrecorded)

 

 

Videos and Files

Link to Pdf file for the 4 lectures of Ashoke Sen

2020-06-01 2020-06-02 2020-06-03 2020-06-04 2020-06-08 2020-06-09 2020-06-10 2020-06-11 2020-06-12
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