Electrostatic description of 3d $$ \mathcal{N} $$ = 4 linear quivers

Abstract We present the holographic dual for the strongly coupled, low energy dynamics of balanced$$ \mathcal{N} $$ N = 4 field theories in (2 + 1) dimensions. The infinite family of Type IIB backgrounds with AdS4× S2× S2 factors is described in terms of a Laplace problem with suitable boundary conditions. The system describes an array of D3, NS5 and D5 branes. We study various aspects of these Hanany-Witten set-ups (number of branes, linking numbers, dimension of the Higgs and Coulomb branches) and encode them in holographic calculations. A generic expression for the Free Energy/Holographic Central Charge is derived. These quantities are then calculated explicitly in various general examples. We also discuss how Mirror Symmetry is encoded in our Type IIB backgrounds. The connection with previous results in the bibliography is made.

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M5-brane sources, holography, and Argyres-Douglas theories

Journal of High Energy Physics ◽

10.1007/jhep11(2021)140 ◽

2021 ◽

Vol 2021 (11) ◽

Author(s):

Ibrahima Bah ◽

Federico Bonetti ◽

Ruben Minasian ◽

Emily Nardoni

Keyword(s):

Warped Product ◽

Central Charge ◽

Field Theories ◽

Internal Space ◽

Flavor Symmetry ◽

Perfect Agreement ◽

Strongly Coupled ◽

Superconformal Field Theories ◽

Holographic Duals ◽

M Theory

Abstract We initiate a study of the holographic duals of a class of four-dimensional $$ \mathcal{N} $$ N = 2 superconformal field theories that are engineered by wrapping M5-branes on a sphere with an irregular puncture. These notably include the strongly-coupled field theories of Argyres-Douglas type. Our solutions are obtained in 7d gauged supergravity, where they take the form of a warped product of AdS5 and a “half-spindle.” The irregular puncture is modeled by a localized M5-brane source in the internal space of the gravity duals. Our solutions feature a realization of supersymmetry that is distinct from the usual topological twist, as well as an interesting Stückelberg mechanism involving the gauge field associated to a generator of the isometry algebra of the internal space. We check the proposed duality by computing the holographic central charge, the flavor symmetry central charge, and the dimensions of various supersymmetric probe M2-branes, and matching these with the dual Argyres-Douglas field theories. Furthermore, we compute the large-N ’t Hooft anomalies of the field theories using anomaly inflow methods in M-theory, and find perfect agreement with the proposed duality.

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S-matrix bootstrap for effective field theories: massless pions

Journal of High Energy Physics ◽

10.1007/jhep06(2021)088 ◽

2021 ◽

Vol 2021 (6) ◽

Author(s):

Andrea L. Guerrieri ◽

João Penedones ◽

Pedro Vieira

Keyword(s):

Effective Field Theories ◽

Bootstrap Method ◽

Effective Field ◽

Low Energy ◽

Field Theories ◽

Proof Of Concept ◽

Energy Dynamics ◽

S Matrix ◽

Energy Constants ◽

Chiral Lagrangian

Abstract We use the numerical S-matrix bootstrap method to obtain bounds on the two leading Wilson coefficients (or low energy constants) of the chiral lagrangian controlling the low-energy dynamics of massless pions. This provides a proof of concept that the numerical S-matrix bootstrap can be used to derive non-perturbative bounds on massless EFTs in more than two spacetime dimensions.

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Aspects of gauge/string dualities

10.23889/suthesis.56598 ◽

2020 ◽

Author(s):

◽

Stefano Speziali

Keyword(s):

String Theory ◽

Central Charge ◽

Black Hole Physics ◽

Broad Class ◽

Three Dimensional ◽

Three Dimensions ◽

Field Theories ◽

Linking Numbers ◽

String Dualities ◽

Chern Simons

In this thesis we investigate on the role that dualities play nowadays in our under-standing of string and Quantum Field Theories.The ﬁrst part is devoted to holographic dualities, where the case of the string dual of certain one-, two- and four dimensional ﬁeld theories is explored in detail. We begin in Chapter 1 by discussing the holographic dual of a broad class of four-dimensional ﬁeld theories. We specialise to the case of quiver ﬁeld theories where a number of formulas computing charges, number of branes and Linking Numbers are given. We then introduce marginal deformations in the supergravity backgrounds to uncover inﬁnite new families of solutions to type II supergravity and M-theory. In Chapter 2, we discuss spin 2 ﬂuctuations around a class of warped AdS3 backgrounds. We identify explicitly the dual operators of a given protected sector. Also, a formula for the central charge of the dual two-dimensional ﬁeld theories is derived. In Chapter 3, we introduce two new classes of geometries with an AdS2 factor. We outline the importance to black hole physics and in one case give a prescription for the dual ﬁeld theories.The second part is devoted to QFT/QFT dualities in Chern-Simons theories, and how dualities between Chern-Simons theories in three dimensions can be motivated in string theory. It is found that a known duality between three-dimensional Chern-Simons theories with unitary gauge symmetry can be motivated by a brane setup in Type 0B string theory with an orientifold. In particular, the phase diagram of unitary QCD3 is inferred from a dual theory.

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Explicit soft supersymmetry breaking in the heterotic M-theory B − L MSSM

Journal of High Energy Physics ◽

10.1007/jhep08(2021)033 ◽

2021 ◽

Vol 2021 (8) ◽

Author(s):

Anthony Ashmore ◽

Sebastian Dumitru ◽

Burt A. Ovrut

Keyword(s):

Line Bundle ◽

Supersymmetry Breaking ◽

Moduli Space ◽

Initial Conditions ◽

Low Energy ◽

Strongly Coupled ◽

Hidden Sector ◽

Effective Lagrangian ◽

Soft Supersymmetry Breaking ◽

M Theory

Abstract The strongly coupled heterotic M-theory vacuum for both the observable and hidden sectors of the B − L MSSM theory is reviewed, including a discussion of the “bundle” constraints that both the observable sector SU(4) vector bundle and the hidden sector bundle induced from a single line bundle must satisfy. Gaugino condensation is then introduced within this context, and the hidden sector bundles that exhibit gaugino condensation are presented. The condensation scale is computed, singling out one line bundle whose associated condensation scale is low enough to be compatible with the energy scales available at the LHC. The corresponding region of Kähler moduli space where all bundle constraints are satisfied is presented. The generic form of the moduli dependent F-terms due to a gaugino superpotential — which spontaneously break N = 1 supersymmetry in this sector — is presented and then given explicitly for the unique line bundle associated with the low condensation scale. The moduli-dependent coefficients for each of the gaugino and scalar field soft supersymmetry breaking terms are computed leading to a low-energy effective Lagrangian for the observable sector matter fields. We then show that at a large number of points in Kähler moduli space that satisfy all “bundle” constraints, these coefficients are initial conditions for the renormalization group equations which, at low energy, lead to completely realistic physics satisfying all phenomenological constraints. Finally, we show that a substantial number of these initial points also satisfy a final constraint arising from the quadratic Higgs-Higgs conjugate soft supersymmetry breaking term.

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Entanglement entropy in low-energy field theories at a finite chemical potential

Physical Review Research ◽

10.1103/physrevresearch.2.033016 ◽

2020 ◽

Vol 2 (3) ◽

Author(s):

Ivan Morera ◽

Irénée Frérot ◽

Artur Polls ◽

Bruno Juliá-Díaz

Keyword(s):

Chemical Potential ◽

Entanglement Entropy ◽

Low Energy ◽

Field Theories ◽

Energy Field

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Boundary conditions in topological AdS4/CFT3

Journal of High Energy Physics ◽

10.1007/jhep02(2021)156 ◽

2021 ◽

Vol 2021 (2) ◽

Author(s):

Pietro Benetti Genolini ◽

Matan Grinberg ◽

Paul Richmond

Keyword(s):

Field Theory ◽

Free Energy ◽

Boundary Conditions ◽

Smooth Solution ◽

Three Dimensional ◽

Field Theories ◽

Legendre Transformation ◽

Generating Functional ◽

Holographic Duals

Abstract We revisit the construction in four-dimensional gauged Spin(4) supergravity of the holographic duals to topologically twisted three-dimensional $$ \mathcal{N} $$ N = 4 field theories. Our focus in this paper is to highlight some subtleties related to preserving supersymmetry in AdS/CFT, namely the inclusion of finite counterterms and the necessity of a Legendre transformation to find the dual to the field theory generating functional. Studying the geometry of these supergravity solutions, we conclude that the gravitational free energy is indeed independent from the metric of the boundary, and it vanishes for any smooth solution.

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AdS2 × S2 × CY2 solutions in Type IIB with 8 supersymmetries

Journal of High Energy Physics ◽

10.1007/jhep04(2021)110 ◽

2021 ◽

Vol 2021 (4) ◽

Author(s):

Yolanda Lozano ◽

Carlos Nunez ◽

Anayeli Ramirez

Keyword(s):

Quantum Mechanics ◽

Riemann Surface ◽

Central Charge ◽

Global Solutions ◽

Infinite Family ◽

Dimensional System ◽

One Dimensional

Abstract We present a new infinite family of Type IIB supergravity solutions preserving eight supercharges. The structure of the space is AdS2 × S2 × CY2 × S1 fibered over an interval. These solutions can be related through double analytical continuations with those recently constructed in [1]. Both types of solutions are however dual to very different superconformal quantum mechanics. We show that our solutions fit locally in the class of AdS2 × S2 × CY2 solutions fibered over a 2d Riemann surface Σ constructed by Chiodaroli, Gutperle and Krym, in the absence of D3 and D7 brane sources. We compare our solutions to the global solutions constructed by Chiodaroli, D’Hoker and Gutperle for Σ an annulus. We also construct a cohomogeneity-two family of solutions using non-Abelian T-duality. Finally, we relate the holographic central charge of our one dimensional system to a combination of electric and magnetic fluxes. We propose an extremisation principle for the central charge from a functional constructed out of the RR fluxes.

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A chiral switchable photovoltaic ferroelectric 1D perovskite

Science Advances ◽

10.1126/sciadv.aay4213 ◽

2020 ◽

Vol 6 (9) ◽

pp. eaay4213 ◽

Cited By ~ 6

Author(s):

Yang Hu ◽

Fred Florio ◽

Zhizhong Chen ◽

W. Adam Phelan ◽

Maxime A. Siegler ◽

...

Keyword(s):

Electric Fields ◽

Mirror Symmetry ◽

Degrees Of Freedom ◽

Electrical Measurements ◽

Temperature Dependent ◽

Paraelectric Phase Transition ◽

Strongly Coupled ◽

Yield Phenomena ◽

Hybrid Perovskite ◽

Low Dimensional

Spin and valley degrees of freedom in materials without inversion symmetry promise previously unknown device functionalities, such as spin-valleytronics. Control of material symmetry with electric fields (ferroelectricity), while breaking additional symmetries, including mirror symmetry, could yield phenomena where chirality, spin, valley, and crystal potential are strongly coupled. Here we report the synthesis of a halide perovskite semiconductor that is simultaneously photoferroelectricity switchable and chiral. Spectroscopic and structural analysis, and first-principles calculations, determine the material to be a previously unknown low-dimensional hybrid perovskite (R)-(−)-1-cyclohexylethylammonium/(S)-(+)-1 cyclohexylethylammonium) PbI3. Optical and electrical measurements characterize its semiconducting, ferroelectric, switchable pyroelectricity and switchable photoferroelectric properties. Temperature dependent structural, dielectric and transport measurements reveal a ferroelectric-paraelectric phase transition. Circular dichroism spectroscopy confirms its chirality. The development of a material with such a combination of these properties will facilitate the exploration of phenomena such as electric field and chiral enantiomer–dependent Rashba-Dresselhaus splitting and circular photogalvanic effects.

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The Swampland Conjectures: A Bridge from Quantum Gravity to Particle Physics

Universe ◽

10.3390/universe7080273 ◽

2021 ◽

Vol 7 (8) ◽

pp. 273

Author(s):

Mariana Graña ◽

Alvaro Herráez

Keyword(s):

Effective Field Theories ◽

Quantum Gravity ◽

Particle Physics ◽

Effective Field ◽

Low Energy ◽

Field Theories ◽

Neutrino Masses ◽

Higgs Potential ◽

Photon Mass ◽

Effective Theories

The swampland is the set of seemingly consistent low-energy effective field theories that cannot be consistently coupled to quantum gravity. In this review we cover some of the conjectural properties that effective theories should possess in order not to fall in the swampland, and we give an overview of their main applications to particle physics. The latter include predictions on neutrino masses, bounds on the cosmological constant, the electroweak and QCD scales, the photon mass, the Higgs potential and some insights about supersymmetry.

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