I will describe recent progress in our understanding of non-supersymmetric black hole microstates through the construction of new families of supergravity solutions, as well as the construction and study of new string worldsheet CFTs describing string dynamics on non-supersymmetric black hole microstate backgrounds.
We describe a family of solutions of the heterotic string effective action to first order in alpha prime. At lowest order, these solutions correspond to well known 4 and 5 dimensional black holes and, with our results, their first order corrections can be found and studied explicitly for the first time in the literature. We show how non-Abelian instantones can reduce or eliminate these corrections.
We report on recent progress in relating gravity to the product of two Yang-Mills theories from the point of view of fields in coordinate space rather than on-shell scattering amplitudes in momentum space.
I will present the first-order in α' corrections to a 3-charge black hole in Heterotic Superstring Theory with the possible addition of SU(2) Yang-Mills fields. All the calculations are carried out in the 10-dimensional theory, avoiding the problems posed by the dimensional reduction or the supersymmetry completions of 5-dimensional actions. Since the solution covers the asymptotically-flat...
We construct a solution of Heterotic supergravity which interpolates between two different AdS3 × S3 × T4 geometries corresponding to the near-horizon limits of two 5-dimensional black holes, only one of which has non-Abelian hair. This solution can be used to estimate the amplitude of probability of the non-perturbative decay of the gauge 5-brane responsible for the non-Abelian hair into...
Microstate geometries are smooth horizonless solutions of supergravity theories, which are claimed to represent the classical description of the microstates of a black hole. So far, no systematic procedure to construct these type of solutions was known. I will talk about the results of arXiv:1709.03985, where we argue that the problem of constructing explicit solutions can be boiled down to...
I will talk about the gauging of maximal supergravity in 8 dimensions using the embedding tensor formalism. Focussing on SO(3) gaugings, I will show how supergravity theories with a different 11-dimensional origin are related by an SL(2,R) duality.
Black holes appear to lead to information loss, thus violating one of the fundamental tenets of Quantum Mechanics. Recent Information-Theory-based arguments imply that information loss can only be avoided if at the scale of the black hole horizon there exists a structure (commonly called fuzzball or firewall) that allows information to escape. I will discuss the highly-unusual properties that...
I will give a short review of the frame-independent formulation of Newtonian gravity, called Newton-Cartan Gravity, and explain why there is a renewed interest into non-relativistic gravity in general. I will discuss, as a particular application, a recent proposal for an Effective Field Theory describing a massive spin-2 mode (the so-called GMP mode) in the Fractional Quantum Hall Effect.
Toroidally compactified M-theory or type II string theory contains a rich variety of exotic branes. In this talk, I will review these exotic branes and construct their supergravity solutions utilizing the framework of the double/exceptional field theory. Some of the obtained solutions depend on the winding coordinates although the section condition is not violated. The mixed-symmetry...
Recently, there has been a fundamental and significant development about the Green-Schwarz (GS) formulation of superstring theory. In this formulation, the kappa-symmetry plays a central role to ensure the consistency of the theory. In 2016 Tseytlin and Wulff showed that the kappa-symmetry constraints of the GS superstring defined on an arbitrary background lead to a ``generalized''...
We connect a puzzle in non-Abelian T-duality to generalized supergravity and show that the Classical Yang-Baxter Equation emerges from deformations of supergravity solutions in a fairly generic way.
I will introduce the symplectic duality bundle of a generic four-dimensional supergravity theory and I will describe how it can be used to extract information on the global geometry and topology of locally geometric supergravity U-folds. Work in collaboration with C. Lazaroiu.
In this talk we will discuss non-Abelian T-duality as a solution generating technique in type II Supergravity, briefly reviewing its potential to motivate, probe or challenge classifications of supersymmetric solutions, and focusing on the open problem of providing the newly generated AdS brackgrounds with consistent dual superconformal field theories. These can be seen as renormalization...
Homogeneous Yang-Baxter (YB) deformation of AdS$_5\times$ S$^5$ superstring is revisited.
In this talk, I explain that homogeneous YB deformations are equivalent to β-deformations of the AdS$_5\times$ S$^5$ background when the classical r-matrices consist of bosonic generators.
If time permitted, I also discuss β-deformations of the AdS$_3\times$ S$^3\times$T$^4$ with $H$-flux and provide...
We will begin with an introduction to the emerging paradigm of “gravity=gauge x gauge”. Then, using a field-theoretic incarnation of this notion, we will demonstrate how that the “square” of an Abelian D=6, N=(2,0) theory yields the free D=6, N=(4,0) theory constructed by Hull, together with its generalized (super)gauge transformations. This offers a new perspective on the (4,0) theory and...
We review the recent construction of instantonic solutions in Type IIB theory on a background of the form AdS5 x S5/Zk and discuss some of their properties.
Dimensional reduction of supergravity theories on spheres plays a central role in the gauge/gravity correspondence. Prominent examples are the reductions of eleven-dimensional supergravity on S7 and type IIB supergravity on S5 which are dual to ABJM and N=4 SYM theories, respectively. Using the recently discovered duality between massive IIA supergravity on S6 and super Chern-Simons-matter...
We present a BPS flow within minimal N=1 supergravity in seven dimensions describing a warped AdS3 background supported by a “dyonic” profile of the three-form. Furthermore, we discuss the holographic interpretation of the above solution in terms of a defect SCFT2 inside the 6d (1,0) theory dual to the AdS in the asymptotic region. Finally we provide the brane picture of the aforementioned...
In this talk I will formulate a path-integral optimization for two-dimensional conformal field theories perturbed by relevant operators. I will present several evidences how this optimization mechanism works, based on calculations in free field theories as well as general arguments of RG flows in field theories. Our optimization is performed by minimizing the path-integral complexity...
Using a derivation from first principles of the path integral associated to a cMERA tensor network, we provide an operational definition for the complexity of a cMERA circuit/state which is relevant to investigate the complexity of states in quantum field theory. In this framework, it is possible to explicitly establish the correspondence (Minimal) Complexity = (Least) Action. Remarkably, it...
In this talk I will present the computation of the one-loop correction to the classical dispersion relation of rigid closed spinning strings with two equal angular momenta in the $AdS_3 \times S^3 \times T^4$ background supported with a mixture of R-R and NS-NS three-form fluxes. This analysis is performed by means of two different methods. The first method relies on the quadratic fluctuations...
We will review recent progress on gravitational duality and the construction of action principles for mixed-symmetry tensor fields, which describe the dual graviton in higher dimensions.
In this talk, we will present the Yang-Mills squared approach to relating gauge theory and gravity, highlighting some of the motivations and connections to other branches of current research. We will introduce a fully BRST covariant version of this correspondence, stressing how this generalisation is not only useful, albeit necessary.
We present a detailed description of N = 2 stationary BPS multicenter black hole solutions for quadratic prepotentials with an arbitrary number of centers and scalar fields making a systematic use of the algebraic properties of the matrix of second derivatives of the prepotential, S, which in this case is a scalar-independent matrix. The anti-involution matrix S can be understood as a...
