I will review some recent results in the costruction of alpha prime corrections of some families of well known solutions of 10 dimensional heterotic string theory and I will comment on their thermodynamical properties. The families taken into account correspond to extremal (non)supersimmetric black holes, their non-extremal generalization and solutions describing multiple (non)supersymmetric...
I'll discuss our recent work, in which we study holographically a strongly coupled (2+1)-dimensional gauge theory subject to an external rotating electric field, both at zero and non-zero temperature. The system is modelled holographically as a D3/D5 probe intersection, and we analyze the phase diagram. We find a conductive phase and an insulating phase, and we observe that the conductive...
Recently, boundary conformal field theories (BCFT) and their holographic duals have received renewed attention due to appearing in models of black hole evaporation. The holographic models involve dynamical end-of-the-world (EOW) branes that encode properties of the BCFT boundary in gravity. In the case of 3D gravity, simple EOW brane models are not able to describe excited states or boundary...
Entanglement islands play a crucial role in our understanding of how Hawking radiation encodes information in a black hole, but their relevance in cosmological spacetimes is less clear. In this paper, we continue our investigation of information recovery in de Sitter space and construct a two-dimensional model of gravity containing a domain wall that interpolates between de Sitter space and...
In recent years there has been an increasing interest in the interplay between amplitudes and cosmological correlators, in particular in the use of amplitudes techniques to constrain cosmological correlators. In this talk, I will give an overview of the formalism of the wavefunction of the universe and how it relates to cosmological correlators. After this, I will review the success of the...
We present an action for the dynamical system of N nearly coincident multiple D0-branes and strings connecting these D0-branes (mD0 system) which is invariant under spacetime (type IIA target superspace) supersymmetry and the local worldline supersymmetry generalizing the kappa-symmetry of single D0-brane action (massive D=10 superparticle or Dirichlet superparticle). The action includes an...
String theories naturally give rise to infinite towers of states whose degeneracies grow exponentially as functions of mass. These infinite towers of states are ultimately responsible for many of the finiteness properties for which string theory is famous. Recently, a framework was developed in which the effects of all of these states can be incorporated in a self-consistent way when...
We study the structure of the higher-curvature gravitational densities that are induced from holographic renormalization in AdSd+1. In a braneworld construction, such densities define a d-dimensional higher-curvature gravitational theory on the brane, which in turn is dual to a (d-1)-dimensional CFT living at its boundary. We show that this CFTd−1 satisfies a holographic c-theorem in general...
In this paper, we study the physical effects of deforming the usual Einstein-Hilbert lagrangian with the Goroff-Sagnotti counterterm (the first which is nonvanishing on shell). The related facts that Schwarzschild’s spacetime is not a solution to the corresponding equations of motion and Birkhoff’s theorem is not valid anymore are analyzed and some consequences worked out.
