TFI 2019: Theories of Fundamental Interactions 2019

21 ott 2019, 11:00 → 23 ott 2019, 13:00 Europe/Rome

Aula Magna del Rettorato (Turin)

The sixth Meeting of the INFN Networks GAST, GSS and ST&FI, devoted to "Theories of the Fundamental Interactions", will take place in Torino - Italy on October 21st (afternoon) and on October 22nd- 23rd, 2019 at the University Rectorate in Via Verdi 8, Turin.

 

The conference will bring together INFN experts in supersymmetric perturbative and non-perturbative quantum theories for gravity and gauge interactions, supergravity, string theory and their applications to black holes, cosmology and condensed matter systems.

Programme

We plan on ~18 talks of 30' each, with some additional time for questions.
 

The workshop will include on Tuesday afternoon a "vision'' session to discuss the near future of research in our domain. This will be organised in three 30' talks, plus 1.5 hours of open discussion (participants who wish to contribute in a more structured way may reserve with the organisers one of few slots of 5-10 minutes). 

 

Preliminary list of speakers:
 

• Dima Sorokin (INFN PD) Membranes and domain walls in N=1, D=4 SYM
• Veronica Guidetti (PhD, BO)Type IIB inflation models
• Lorenzo Di Pietro (UniTS) Constraints on boundary-localized interactions
• Mritunjay Verma (Postdoc, NA) Open Closed Super String Field Theory
• Francesco Galvagno (PhD,TO) Emitted radiation and geometry
• Johan Blåbäck (Postdoc, RM-ToV) Anti-D6-brane singularities and resolution
• Lorenzo Bartolini (PhD, PI) Nucleons and Deuteron electric dipole moment from Holographic QCD (and few words on Isospin breaking)
• Nadir Fasola (PhD, TS) Surface defects in gauge theories                            
• Roberto Auzzi (BS)On complexity in holography                                         
• Hasmik Poghosyan (Postdoc, BO)T, Q and periods in SU(3) N=2 SYM                
• Sara Bonansea (PhD, FI/PR) The fate of the circular Wilson Loops in N=4 dCFT
• Alice Bernamonti (FI) The first law of complexity
• Karapet Mkrtchyan (RTDA, PI) On duality-symmetric descriptions and self-dual fields in any dimensions
• Lucrezia Ravera (Postdoc, MI): Einstein manifolds with torsion and nonmetricity and some applications in (super)gravity 
• Matteo Sacchi (PhD, MIB) From 3d dualities to 2d free field correlators and back
• Azeem Hasan (Postdoc, LE) Dualities in SUSY Gauge Theories in Various Dimensions
• Davide Cassani (INFN PD) Microstate counting for rotating BH in AdS/CFT

Vision talks:

• Alberto Zaffaroni (MIB)
• Itamar Yaakov (INFN Parma)
• Domenico Orlando (INFN Turin)

Scientific Advisory Board: Giulio Bonelli, Anna Ceresole, Gianluca Grignani

Local Organizing Committee:  Anna Ceresole, Igor Pesando

lunedì 21 ottobre

13:00 (light) Lunch and Registration

Monday afternoon 1: SUGRA 1

1 Membranes and domain walls in N=1, D=4 SYM

We will review main features of the pure N=1, D=4 SYM and its effective description by the Veneziano-Yankielowicz generalized sigma-model. We will then argue that the construction of 1/2 BPS domain walls interpolating between different SYM vacua requires the presence of a dynamical membrane source. We will show how such a membrane is coupled to the SYM and present the explicit form of the BPS domain walls which it creates in the Veneziano-Yankielowicz effective theory.

Relatore: Dmitri Sorokin (INFN PD)

Membranes and Domain Walls.pdf

2 Nucleons and Deuteron electric dipole moment from Holographic QCD (and few words on Isospin breaking)

In the framework of the Witten-Sakai-Sugimoto holographic model of QCD, we describe our progresses in the derivation of a quantitative prediction for the $\theta$-induced electric dipole moment of the nucleons and their deuteron bound state, discussing current limitations and future directions. Then, introducing explicit isospin breaking in the form of different quark masses, we also qualitatively show how the model accounts for mass splittings of isospin multiplets.

Relatore: Lorenzo Bartolini (Istituto Nazionale di Fisica Nucleare)

Talk.pdf

3 Constraints on Boundary-localized Interactions

We consider interacting conformal boundary conditions for bulk theories of free fields. For a free vector field in 4 bulk dimensions there is a rich class of such boundary conditions, coming in families which are connected by a bulk marginal deformation, and with an interesting action of bulk electric-magnetic duality. For the bulk theory of a free scalar in generic dimensions it is not known if any conformal boundary condition exists besides the free ones (Neumann and Dirichlet). We explain how this question can be addressed using conformal bootstrap methods.

Relatore: Lorenzo Di Pietro (Università di Trieste)

0103-DiPietro.pdf

16:15 Coffee break

Monday afternoon 2: SUGRA 2 + VARIOUS

4 Einstein manifolds with torsion and nonmetricity and some applications in (super)gravity theories

I will introduce Einstein manifolds with torsion and nonmetricity and present new applications in the context of (super)gravity theories, focusing, in particular, on models in three dimensions.

Relatore: Lucrezia Ravera (Istituto Nazionale di Fisica Nucleare)

0104-ravera.pdf

5 Anti-D6-brane singularities and resolution

Recently anti-brane singularities have been argued to be resolved when the polarisation have been taken into account properly. The anti-D6-brane singularity however seems to be the odd-one out. In this talk I will present recent work that suggests that the anti-D6-brane can be resolved in the same way by avoiding previous no-gos, and give numerical evidence that these solutions could be found in supergravity as well.

Relatore: Johan Blåbäck

0105-blaback.pdf

martedì 22 ottobre

Tuesday morning 1: SUGRA 3 + VARIOUS

6 The BPS limit of AdS black hole thermodynamics and its microscopic counterpart

The talk will present progress towards a microscopic understanding of the entropy of rotating BPS black holes in AdS. I will describe a new BPS limit of black hole thermodynamics which first focuses on a supersymmetric family of complexified solutions and then reaches extremality. In this limit the chemical potentials obey a constraint that is interpreted as a regularity condition in the Euclidean bulk geometry, and the on-shell gravitational action, which is the grand-canonical counterpart of the Bekenstein-Hawking entropy, takes a very simple form. I will then focus on AdS_5 black holes, where the gravitational analysis instructs us that the holographic dual N=1 superconformal field theory is defined on a twisted S^1 x S^3 with complexified chemical potentials obeying the constraint, and localization allows to compute the partition function exactly. This computation defines a slightly modified supeconformal index as well as a generalization of the supersymmetric Casimir energy. I will discuss how the black hole entropy is encoded in these quantities.

Relatore: Davide Cassani (PD)

talk_DCassani.pdf

7 The First Law of Complexity

Based on Nielsen’s geometric approach, the variation of holographic complexity for two nearby target states only depends on the end point of the optimal trajectory, a result designated as the first law of complexity. As an example, we will examine the complexity=action conjecture when the AdS vacuum is perturbed by a scalar field excitation, which corresponds to a coherent state.

Relatore: Alice Bernamonti (Università degli Studi di Firenze)

0203-Bernamonti.pdf

8 On complexity in holography

Computational complexity is a quantum information concept that recently captured increasing attention in gravitational holography. In particular, the complexity=volume (CV) and complexity=action (CA) conjectures have been proposed as gravitational duals of quantum computational complexity. In this talk I will discuss these holographic conjectures and their subregion generalizations in a few specific situations in asymptotically AdS$_3$ spacetimes and in its Warped generalization.

Relatore: Roberto Auzzi

auzzi-complexity-TFI2019.pdf

10:45 Coffee break

Tuesday morning 2: STRING + VARIOUS

9 Type IIB inflation models

I will talk about different aspects of inflationry models that can arise from 4D effective theories coming from type IIB String Theory. In particular I'll focus on concrete embeddings of fibre and Kähler moduli inflation.

Relatore: Veronica Guidetti (Istituto Nazionale di Fisica Nucleare)

0204_Guidetti.pdf

10 Bootstrapping dS Exchanges

Relatore: Massimo Taronna (NA)

05_Taronna.pdf

11 On duality-symmetric descriptions and self-dual fields in any dimensions.

I will discuss the problem of duality-symmetric descriptions for free fields
with the main focus on the covariant Lagrangian formulation generalising
that of Pasti, Sorokin and Tonin for duality-symmetric descriptions in d=4k,
as well as self-dual fields in d=4k+2 Minkowski spaces.

Relatore: Karapet Mkrtchyan (unipi)

0206-Mkrtchyan.pdf

13:00 Lunch

Vision

12 Vision 1

Relatore: Zaffaroni Alberto

13 Vision 2

Relatore: Itamar Yakov

Itamar Yaakov - Vision Talk - TFI2019.pdf

14 Vision 3

Relatore: Domenico Orlando

0209-Orlando.pdf

16:30 Coffee break

Discussion

20:30 Social Dinner

mercoledì 23 ottobre

Wednesday morning 1: QFT 1

15 Emitted radiation and geometry

We discuss the computation of the radiated energy by an accelerated heavy particle. This quantity is captured by the one-point function of the stress energy tensor in presence of a Wilson line. In a N=2 superconformal theory we prove that this observable is exactly related to a small geometric deformation of the background geometry. In a four dimensional case, supersymmetric localization allows to express the emitted energy in terms of a matrix model on a squashed sphere.

Relatore: Francesco Galvagno (Università di Torino)

01_Galvagno.pdf

16 Defects, nested instantons and comet shaped quivers

We study the effective SUSY theory of a surface defect describing the parabolic reduction of gauge connections at punctures on Riemann surfaces, which gives rise to a quiver GLSM. We will show how the partition function of such a theory naturally computes certain virtual invariants of the moduli spaces of stable representations of the quiver and how these results relate to a conjecture of Hausel, Letellier and Rodriguez-Villegas about the cohomology of character varieties.

Relatore: Nadir Fasola (Istituto Nazionale di Fisica Nucleare)

02_Fasola.pdf

17 T, Q and periods in SU(3) N=2 SYM

We consider the third order differential equation derived from the deformed Seiberg-Witten differential for pure ${\cal N}=2$ SYM with gauge group $SU(3)$ in Nekrasov-Shatashvili limit of $\Omega$-background. We show that this is the same differential equation that emerges in the context of Ordinary Differential Equation/Integrable Models (ODE/IM) correspondence for $2d$ $A_2$ Toda CFT with central charge $c=98$. We derive the corresponding $QQ$ and related $TQ$ functional relations and establish the asymptotic behaviour of $Q$ and $T$ functions at small instanton parameter $q \rightarrow 0$. Moreover, numerical integration of the Floquet monodromy matrix of the differential equation leads to evaluation of the $A$-cycles $a_{1,2,3}$ at any point of the moduli space of vacua parametrised by the vector multiplet scalar VEVs $\langle \textbf{tr}\,\phi^2\rangle$ and $\langle \textbf{tr}\,\phi^3\rangle$ even for large values of $q$ which are well beyond the reach of instanton calculus. The numerical results at small $q$ are in excellent agreement with instanton calculation. We conjecture a very simple relation between Baxter's $T$-function and $A$-cycle periods $a_{1,2,3}$, which is an extension of Alexei Zamolodchikov's conjecture about Mathieu equation.

Relatore: Hasmik Poghosyan (University of Bologna)

SU(3)SYMODE.pdf

10:45 Coffee break

Wednesday morning 2: QFT 2

18 The fate of the circular Wilson Loops in N=4 dCFT

We consider circular Wilson loops in a defect version of N=4 super-Yang-Mills theory
which is dual to the D5-D3 brane system. When the loops are parallel to the defect, we
can construct both BPS and non-BPS operators. At strong 't Hooft coupling we observe,
in the non-BPS case, a Gross-Ooguri-like phase transition in the dual gravitational theory:
the familiar disk solution dominates when the operator is far from the defect while a
cylindrical string worldsheet, connecting the boundary loop with the probe D5-brane, is
favourite below a certain distance. In the BPS case, the cylindrical solution does not exist
for any choice of the physical parameters, suggesting that light-modes supergravity
exchanges with the disk solution always saturate the expectation value at strong coupling.
We study the double-scaling limit for large k and large 't Hooft coupling that allow us to
compare perturbative and non-perturbative results.

Relatore: Sara Bonansea (Università degli studi di Firenze)

04_Bonansea.pdf

19 Dualities in SUSY Gauge Theories in Various Dimensions

Seiberg duality is an infrared equivalence of two 4d, N=1 gauge theories first proposed by Seiberg in 1994. More recently a triality relating 2d, (0,2) theories and a quadrality relating 0d, N=1 matrix models have been discovered, both of these can be viewed as generalizations of Seiberg duality to lower dimensions. We illustrate these dualities with the help of simple examples arising on worldvolume of D-branes probing certain Calabi-Yau singularities. These Calabi-Yau are a higher dimensional generalization of conifold singularity. Applying triality and quadrality to them uncovers similarities to duality cascade for conifold discovered by Klebanov and Strassler.

Relatore: Azeem Hasan (Istituto Nazionale di Fisica Nucleare)

05_Hasan.pdf

20 From 3d dualities to 2d free field correlators and back

Infra-red dualities are interesting phenomena that may characterize the low energy behaviour of quantum field theories. One challenging question is whether it is possible to find some organizing principle that allows us to derive the currently known dualities in low dimensions from some mother dualities in higher dimensions upon dimensional reduction. When the theory is supersymmetric, this problem can be effectively tackled using supersymmetric localization. This technique also allowed us to discover gauge/CFT correspondeces, where exact quantities in supersymmetric gauge theories are mapped to CFT correlators. In this talk, I will first discuss an instance of such correspondences by presenting a connection of 3d $\mathcal{N}=2$ theories with 2d CFT free field correlators, which can be obtained as a suitable limit of the $S^2\times S^1$ partition function. After establishing this dictionary, I will show how the logic of the dimensional reduction can be pushed further and even reversed, uplifting some known integral identities for 2d free field correlators to new IR dualities in 3d.

Relatore: Matteo Sacchi (Università degli Studi Milano-Bicocca & INFN Bicocca)

06_Sacchi.pdf