Journalklubb
Målgruppen för journalklubben är doktorander och postdocs som forskar om olika ämnen inom teoretisk fysik. Idén är att vi möts för att lära oss och diskutera klassiska och intressanta ämnen inom teoretisk fysik.
Organisatör: Giulia Fardelli (giulia.fardelli@physics.uu.se)
Talks - Spring 2022
A Note on Complex Spacetime Metrics
Speaker: Rodolfo Panerai
Papers:
- A Note on Complex Spacetime Metrics 2111.06514
Date: 28 January 2022, 1.30 pm
Location: Å80121 or Zoom https://uu-se.zoom.us/j/69181515232
Automorphic Spectra and the Conformal Bootstrap
Speaker: Andrea Manenti
Papers:
- Codes, Lattices, and CFTs at Higher Genus 2111.12716
Date: 21 January 2022, 1.30 pm
Location: Å4005 or Zoom https://uu-se.zoom.us/j/69181515232
Talks - Fall 2021
Codes, Lattices, and CFTs at Higher Genus
Speaker: Johan Henriksson (Pisa U.)
Papers:
- Codes, Lattices, and CFTs at Higher Genus 2112.05168
Date: Wednesday 15 December 2021, 3.15 - 4.45 pm
Location: Å90101 or Zoom https://uu-se.zoom.us/j/69181515232
BV-quantization of fuzzy field theories
Speaker: Hans Nguyen (Nottingham U.)
Papers:
- Batalin-Vilkovisky quantization of fuzzy field theories 2107.02532
Date: 10 December 2021, 1.30 - 3.00 pm
Location: Å80127 or Zoom https://uu-se.zoom.us/j/69181515232
Flat connections in three-manifolds and classical Chern-Simons invariant
Speaker: Roman Mauch
Papers:
- Flat connections in three-manifolds and classical Chern-Simons invariant 1710.09629
Date: 03 December 2021, 1.30 - 3.00 pm
Location: Å80101 or Zoom https://uu-se.zoom.us/j/69181515232
A CFT optical theorem and conformal Regge theory
Speaker: Sourav Sarkar
Papers:
- The perturbative CFT optical theorem and high-energy string scattering in AdS at one loop 2012.01515
Date: 26 November 2021, 1.30 - 3.00 pm
Location: ITC 1111 or Zoom https://uu-se.zoom.us/j/69181515232
Heavy particles and the binary inspiral problem
Speaker: Kays Haddad
Papers:
- Exponentiation of the leading eikonal with spin 2109.04427
- On-shell heavy particle effective theories 2001.09164
- Heavy Black Hole Effective Theory 1908.10308
Date: 19 November 2021, 1.30 - 3.00 pm
Location: Å80127 or Zoom https://uu-se.zoom.us/j/69181515232
Temperature dualities from Eisenstein series in higher dimensions
Speaker: Francesco Alessio
Papers:
- Notes on massless scalar field partition functions, modular invariance and Eisenstein series 2111.03164
Date: 12 November 2021, 1.30 - 3.00 pm
Location: Å80101 or Zoom https://uu-se.zoom.us/j/69181515232
On the Entanglement Entropy in CFTs and Holography
Speaker: Jacopo Sisti
Papers:
- Monodromy Defects in Free Field Theories 2104.01220
- Holographic Entanglement Entropy of the Coulomb Branch 2012.05188
- Corner contributions to holographic entanglement entropy in AdS4/BCFT3 1708.05080
Date: 29 October 2021, 1.30 - 3.00 pm
Location: Å80127 or Zoom https://uu-se.zoom.us/j/69181515232
Massive matter and the double copy
Speaker: Ingrid Vazquez-Holm
Papers:
- Extracting Einstein from the Loop-Level Double-Copy 2108.06798
- Loop-Level Double-Copy for Massive Quantum Particles 2010.13435
Date: 15 October 2021, 1.30 - 3.00 pm
Location: Å80101 or Zoom https://uu-se.zoom.us/j/69181515232
Amplitudes in the eikonal limit, black-hole scattering and radiation
Speaker: Carlo Heissenberg
Papers:
- Infrared Divergences and the Eikonal Exponentiation 2105.04594
- The Eikonal Approach to Gravitational Scattering and Radiation at O(G3) 2104.03256
- Radiation Reaction from Soft Theorems 2101.05772
- Universality of ultra-relativistic gravitational scattering 2008.12743
Date: 08 October 2021, 1.30 - 3.00 pm
Location: Å10132 or Zoom https://uu-se.zoom.us/j/69181515232
Building gauge theories and Calabi Yaus in diverse dimensions
Speaker: Azeem Hasan
Abstract: Minimally supersymmetric gauge theories in various dimensions can be engineered on worldvolume of D-branes probing transverse Calabi Yau singularities. This setup is most well studied for N=1 theories in 4d on D3 branes probing Calabi Yau threefolds. Less well studied are (0,2) theories in 2d on D1 branes probing fourfolds and N=1 matrix models on D(-1) branes probing fivefolds. In this talk I will describe an algorithm (arXiv:2004.13765) that leverages the uniform description of these theories developed in arXiv:1904.07954 to construct (0,2) 2d theories and N=1 0d matrix models and the corresponding geometries starting from better understood 4d N=1 theories and the corresponding 3 folds.
Papers:
- Calabi-Yau Products: Graded Quivers for General Toric Calabi-Yaus 2004.13765
- Graded Quivers, Generalized Dimer Models and Toric Geometry 1904.07954
Date: 01 October 2021, 1.30 - 3.00 pm
Location: ITC 6140 or Zoom https://uu-se.zoom.us/j/69181515232
Towards F-theory Realizations of Exact MSSM Matter Spectra
Speaker: Muyang Liu
Abstract: The exact matter spectrum is a significant characteristic of 4D N=1 F-theory compactification, which is expected to match the particle physics we observe. This spectrum is specified by line bundles cohomologies associated to relevant matter curves under the presence of gauge background. In the study of realistic F-theory geometry, those line bundles in the consideration turn into the so-called root bundles. I will elaborate on the developments of interpretation and computation of root bundles based on work 2102.10115 and 2104.08297.
Papers:
- Statistics of Limit Root Bundles Relevant for Exact Matter Spectra of F-Theory MSSMs 2104.08297
- Root Bundles and Towards Exact Matter Spectra of F-theory MSSMs 2102.10115
Date: 24 September 2021, 1.30 - 3.00 pm
Location: Å80121 or Zoom https://uu-se.zoom.us/u/cdKP2PSxK5
Talks - Spring 2021
Recent developments in Jackiw-Teitelboim gravity
Speaker: Rodolfo Panerai
Abstract: This talk will be based on [1903.11115] and follow-ups. I will review the connection between JT gravity and random matrix ensembles. At infinite cutoff, the results for arbitrary topologies are captured by the Mirzakhani-Eynard-Orantin topological recursion. At finite cutoff, the theory is described by some integrable deformation of the boundary action, but various questions about the role of nonperturbative corrections are still open. In the last part of the talk, I will briefly describe the results of my upcoming paper on the subject.
Papers:
- JT gravity as a matrix integral 1903.11115
Date: 04 June 2021, 1.30 - 3.00 pm
Location: Zoom
The Weyl double copy from twistor space
Speaker: Lucile Cangemi
Abstract: The aim of the talk is to introduce a specific classical double copy formalism and, following the recent paper [2103.16441], discuss its relation to twistor space. A classical double copy is a procedure that relates certain exact classical solutions in Einstein gravity and electromagnetism. I will briefly recap the development of the formalism of the Weyl double copy and introduce the necessary concepts to derive it from twistor space. The introduction of twistor space will broaden the scope of the original procedure and suggests possible extensions.
Papers:
- The Weyl double copy from twistor space 2103.16441
Date: 21 May 2021, 1.30 - 3.00 pm
Location: Zoom
The string dual to free N=4 super Yang-Mills
Speaker: Charles Thull
Abstract: The aim of this talk is to give an overview of the worldsheet description of the AdS5xS5 string as proposed in [2104.08263]. Starting from the free field description with its spectrally flowed sectors I will present the constraints from gauge fixing and quantization and discuss the resulting physical spectrum. Evidence is given that this spectrum matches with the planar spectrum of free maximally supersymmetric Yang-Mills.
Papers:
- The String Dual to Free N=4 Super Yang-Mills 2104.08263
Date: 07 May 2021, 1.30 - 3.00 pm
Location: Zoom
4D Chern-Simons Theory and Integrability
Speaker: Simon Ekhammar
Abstract: The main goal of the talk will be to discuss 4D Chern-Simons and in particular the integrable structure of the theory. I will start by reviewing fundamental concepts in integrability primarily using the canonical example of the XXX-spin. In particular I intend to discuss R-matrices, RTT relations and shortly comment on the relations between the three different realizations of Yangians. Thereafter following the papers 1709.09993, 1802.01579 I will discuss how the same concepts are realized using Chern-Simons gauge theory in 4 dimensions. Depending on time I will shortly also comment on more recent progress in various directions using this formalism.
Papers:
- Gauge Theory and Integrability, I 1709.09993
- Gauge Theory and Integrability, II 1802.01579
Date: 23 April 2021, 1.30 - 3.00 pm
Location: Zoom
Exact properties of an integrated correlator in N=4 SU(N) SYM
Speaker: Carlos Gustavo Rodriguez Fernandez
Papers:
- Exact properties of an integrated correlator in N=4 SU(N) SYM 2102.09537
Date: 09 April 2021, 1.30 - 3.00 pm
Location: Zoom
Exact solutions in N=2 D=4 Gauged Supergravity coupled to abelian vector multiplets
Speaker: Davide Astesiano
Papers:
- Super throats with non trivial scalars 2003.11582
- De Sitter magnetic black hole dipole with a supersymmetric horizon 2012.04362
Date: 19 March 2021, 1.30 - 3.00 pm
Location: Zoom
Classical de Sitter solutions between two mirrors: A new recipe?
Speaker: Daniel Panizo Pérez
Abstract: In this talk, we will take a look at new results from type IIA supergravity compactifications. A four-dimensional space with positive cosmological constant is obtained by solving the ten-dimensional equations of motion. To achieve these results, a characteristic topology and O-planes are required. However, this achievement is not free of controversy, as some of its features are not well-understood or are incompatible with no-go theorems. We will introduce all required ingredients that are present in these results and then examine their properties.
Papers:
- Classical de Sitter Solutions of Ten-Dimensional Supergravity 1812.04147
- No classical (anti-)de Sitter solutions with O8-planes 1902.08209
- New de Sitter Solutions in Ten Dimensions and Orientifold Singularities 1911.04498
- What if string theory has no de Sitter vacua? 1804.01120
- Smeared versus localised sources in flux compactifications 1009.1877
- Daniel's notes
Date: 05 March 2021, 1.30 - 3.00 pm
Location: Zoom
3D Chern-Simons theory and the R matrix
Speaker: Maor Ben-Shahar
Abstract: I will explain the details of the construction of a classical r-matrix from 3D Chern-Simons theory following [1905.03263]. The construction relies on imposing unconventional gauge choices and boundary conditions on $R^2 \times I$. These choices imply that expectation valued of knots are always well-defined (no framing anomaly), but are not knot-invariants. Finally, we will extend the paper a little by discussing corrections to all orders in $\hbar$.
Papers:
- Chern-Simons Theory and the R-Matrix 1905.03263
Date: 19 February 2021, 1.30 - 3.00 pm
Location: Zoom
More on holographic correlators: Twisted and dimensionally reduced structures
Speaker: Andrea Manenti
Papers:
- More on holographic correlators: Twisted and dimensionally reduced structures 2101.04114
Date: 05 February 2021, 1.30 - 3.00 pm
Location: Zoom
Celestial Amplitudes and the Double Copy
Speaker: Lucia Garozzo
Abstract: Celestial amplitudes are obtained by performing a change of basis on traditional scattering amplitudes. They behave as conformal correlators, giving rise to the speculation that there is a CFT living on the celestial sphere at the null boundary of flat spacetime, and thus a possible holographic description of flat space quantum gravity. I will give an overview of the topic and present the result of the paper 2007.15027, where the authors find a simple prescription to relate gauge theory and gravity celestial amplitudes at tree level.
Papers:
- A Double Copy for Celestial Amplitudes 2007.15027
Date: 22 January 2021, 1.30 - 3.00 pm
Location: Zoom
TALKS - FALL 2020
Exploring standard like models
Speaker: Robin Schneider
Papers:
- Explore and Exploit with Heterotic Line Bundle Models 2003.04817
Date: 03 December 2020, 1.30 - 3.00 pm
Location: Zoom
Large p explorations. From SUGRA to big STRINGS in Mellin space
Speaker: Giulia Fardelli
Papers:
- Large p explorations. From SUGRA to big STRINGS in Mellin space 2007.09176
Date: 20 November 2020, 1.30 - 3.00 pm
Location: 80101, Zoom
What can Spinning Particles say about Kerr Black Holes?
Speaker: Paolo Pichini
Papers:
- From Scattering Amplitudes to Classical Physics: Universality, Double Copy and Soft Theorems 1903.12419
- Tree-Level Unitarity Constraints on the Gravitational Couplings of Higher-Spin Massive Fields 9408073
Date: 13 November 2020, 1.30 - 3.00 pm
Location: 80101, Zoom
Double copy in string and field theories
Speaker: Yong Zhang
Date: 6 November 2020, 1.30 - 3.00 pm
Location: 80101, Zoom
Superconformal kinematics in four dimensions
Speaker: Andrea Manenti
Papers:
- Differential operators for superconformal correlation functions 1910.12869
- R-current three-point functions in 4d N=1 superconformal theories 1804.09717
- Implications of ANEC for SCFTs in four dimensions 1905.09293
Date: 23 October 2020, 1.30 - 3.00 pm
Location: Häggsalen, Zoom
Computing (multiloop) Feynman integrals through analytic and numerical methods
Speaker: Martijn Hidding
Papers:
- All orders structure and efficient computation of linearly reducible elliptic Feynman integrals 1712.04441
- Evaluating two-loop non-planar master integrals for Higgs + jet production with full heavy-quark mass dependence 1907.13156
- The complete set of two-loop master integrals for Higgs + jet production in QCD 1911.06308
- DiffExp, a Mathematica package for computing Feynman integrals in terms of one-dimensional series expansions 2006.05510
Date: 16 October 2020, 1.30 - 3.00 pm
Location: Polhemsalen, Zoom
On-shell constructions of nonlinear sigma model
Speaker: Zhewei Yin
Date: 09 October 2020, 1.30 - 3.00 pm
Location: Häggsalen, Zoom
Vertex operators for the 11D pure spinor superparticle
Speaker: Max Guillen
Date: 02 October 2020, 1.30 - 3.00 pm
Location: Polhemsalen, Zoom
Introducing 3d N=1 QFTs
Speaker: Vladimir Bashmakov
Date: 25 September 2020, 1.30 - 3.00 pm
Location: ITC room 2247, Zoom
Talks - Spring 2020
Fermionic Localization of the Schwarzian Theory
Speaker: Lorenzo Ruggeri
Papers:
- Fermionic Localization of the Schwarzian Theory 1703.04612
- Conformal symmetry and its breaking in two dimensional Nearly Anti-de-Sitter space 1606.01857
Date: 11 March 2020, 1.30 - 3.00 pm
Location: Room Å80101
Stringy Canonical Forms
Speaker: Fei Teng
Papers:
- Stringy Canonical Forms 1912.08707
Date: 06 March 2020, 1.30 - 3.00 pm
Location: Room Å4003
Sphere Packing and Quantum Gravity II
Speaker: Alexander Söderberg
Papers:
- Sphere Packing and Quantum Gravity 1905.01319
Date: 28 February 2020, 1.30 - 3.00 pm
Location: Room Å4003
Walls, Anomalies, and (De)Confinement in Quantum Anti-Ferromagnets
Speaker: Arash Arabi Ardehali
Papers:
- Walls, Anomalies, and (De)Confinement in Quantum Anti-Ferromagnets 1706.05731
Date: 21 February 2020, 1.30 - 3.00 pm
Location: Room Å4003
Sphere Packing and Quantum Gravity
Speaker: Alexander Söderberg
Papers:
- Sphere Packing and Quantum Gravity 1905.01319
- Modular Bootstrap Revisited 1608.06241
Date: 14 February 2020, 1.30 - 3.00 pm
Location: Room Å4003
Froissart bound for/from CFT Mellin amplitudes
Speaker: Parijat Dey
Papers:
- Froissart bound for/from CFT Mellin amplitudes: 1911.05974
Date: 07 February 2020, 1.30 - 3.00 pm
Location: Room Å4003
GSO projections via SPT phases
Speaker: Luca Cassia
Papers:
- GSO projections via SPT phases: 1908.04805
- Topological Superconductors on Superstring Worldsheets: 1911.11780
Date: 24 January 2020, 1.30 - 3.00 pm
Location: Room Å4003
Higher U(1) Charge Models in type IIB and their F-theory lift
Speaker: Damián K. Mayorga Pena
Abstract:
We construct models with U(1) gauge group and matter with charges up to 6, in the context of type IIB compactifications. We show explicitly that models with charges up to 4 can be derived from corresponding models in F-theory by applying the Sen weak coupling limit. We derive which type IIB models should be the limit of charge 5 and 6 F-theory models. Explicit six dimensional type IIB models with maximal charge 5 and 6 are constructed on an algebraic K3 surface that is the double cover of CP2. By using type IIB results we are also able to rediscover the F-theory charge 4 model in a straightforward way.
Date: 15 January 2020, 1.30 - 3.00 pm
Location: Room Å80101