580 California St., Suite 400
San Francisco, CA, 94104
It has been suggested by Groot Nibbelink and Pospelov that Lorentz invariance can be an emergent symmetry of low-energy physics provided the theory enjoys a nonrelativistic version of supersymmetry. We construct a model that realizes the... more
We provide a method to calculate the rate of false vacuum decay induced by a black hole. The method uses complex tunneling solutions and consistently takes into account the structure of different quantum vacua in the black hole metric via... more
We study supersymmetric extension of the Einstein-aether gravitational model where local Lorentz invariance is broken down to the subgroup of spatial rotations by a vacuum expectation value of a timelike vector field called aether.... more
Ultralight scalar dark matter can interact with all massive Standard Model particles through a universal coupling. Such a coupling modifies the Standard Model particle masses and affects the dynamics of Big Bang Nucleosynthesis. We model... more
We use complex semiclassical method to compute scattering amplitudes of a point particle in dilaton gravity with a boundary. This model has nonzero minimal black hole mass Mcr. We find that at energies below Mcr the particle trivially... more
We propose a semiclassical method to calculate S-matrix elements for twostage gravitational transitions involving matter collapse into a black hole and evaporation of the latter. The method consistently incorporates back-reaction of the... more
OPERA has claimed the discovery of superluminal propagation of neutrinos. We analyze the consistency of this claim with previous tests of special relativity. We find that reconciling the OPERA measurement with information from SN1987a and... more
We argue that superluminal signal propagation is possible in consistent Poincare invariant quantum field theories in two space-time dimensions, provided spatial parity is broken. This happens due to existence of the "instantaneous" causal... more
Hořava's proposal for non-relativistic quantum gravity introduces a preferred time foliation of space-time which violates the local Lorentz invariance. The foliation is encoded in a dynamical scalar field which we call 'khronon'. The... more
We show that the 4-Dimensional Composite Higgs Model (4DCHM) could provide an even better explanation than the Standard Model (SM) of the current Large Hadron Collider (LHC) data pointing to the discovery of a neutral Higgs boson. The... more
We calculate the complete one-loop quantum corrections to the helicity eigenstate chargino pair production cross sections in polarized electron positron collisions, within the Minimal Supersymmetric Standard Model. We calculate the... more
The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π ± , K ± and p+p in Pb-Pb collisions at √ s NN = 2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were... more
We report the measurement of a new observable of jet quenching in central Pb-Pb collisions at √ s NN = 2.76 TeV, based on the semi-inclusive rate of charged jets recoiling from a high transverse momentum (high-p T ) charged hadron... more
The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapidities in pp collisions at √ s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/ψ through the dilepton decay... more
We consider four-dimensional N = 1 supergravity models of a kind appearing in string flux compactifications. It has been recently shown that, by using double three-form multiplets instead of ordinary chiral multiplets, one can promote to... more
We propose quantum gravitational constraints on effective four-dimensional theories with N = 1 supersymmetry. These Swampland constraints arise by demanding consistency of the worldsheet theory of a class of axionic, or EFT, strings whose... more
We write down the general conditions for N = 1 supersymmetric fourdimensional domain walls, deriving them from a ten-dimensional point of view using generalized complex geometry. In cases where the compactification allows for a truncation... more
Swampland criteria like the Weak Gravity Conjecture should not only apply to particles, but also to other lower-codimension charged objects in 4d EFTs like strings and membranes. However, the description of the latter is in general subtle... more
We observe a direct relation between the existence of fundamental axionic strings, dubbed EFT strings, and infinite distance limits in 4d N = 1 EFTs coupled to gravity. The backreaction of EFT strings can be interpreted as RG flow of... more
Vacuum compactifications may suffer from instabilities under small perturbations or tunnel effects; both are difficult to analyze. In this paper we consider the issue from a higher-dimensional perspective. We first look at how stability... more
We observe a direct relation between the existence of fundamental axionic strings, dubbed EFT strings, and infinite distance limits in 4d$$ \mathcal{N} $$N= 1 EFTs coupled to gravity. The backreaction of EFT strings can be interpreted as... more
Swampland criteria like the Weak Gravity Conjecture should not only apply to particles, but also to other lower-codimension charged objects in 4d EFTs like strings and membranes. However, the description of the latter is in general subtle... more
We show that different (brane and constrained superfield) descriptions for the Volkov-Akulov goldstino coupled to N = 1, D = 4 supergravity with matter produce similar wide classes of models with spontaneously broken local supersymmetry... more
We study the conditions to have supersymmetric D-branes on general N = 1 backgrounds with Ramond-Ramond fluxes. These conditions can be written in terms of the two pure spinors associated to the SU (3) × SU (3) structure on T M ⊕ T ⋆ M ,... more
A geometrical form of the supersymmetry conditions for D-branes on arbitrary type II supersymmetric backgrounds is derived, as well as the associated BPS bounds. The treatment is general and allows to consider, for instance, non-static... more
We construct a class of supersymmetric vacua of type IIB string theory describing systems of three-and seven-branes non-perturbatively completed by brane instantons. The vacua are specified by a set of holomorphic functions defined over a... more
We write down the general conditions for N = 1 supersymmetric fourdimensional domain walls, deriving them from a ten-dimensional point of view using generalized complex geometry. In cases where the compactification allows for a truncation... more
We consider four-dimensional $$ \mathcal{N}=1 $$ N = 1 supergravity models of a kind appearing in string flux compactifications. It has been recently shown that, by using double three-form multiplets instead of ordinary chiral multiplets,... more
We study an interquark QQ potential for the charmonium system, that is determined from the the equal-time and Coulomb gauge QQ Bethe-Salpeter (BS) wavefunction through the effective Schrödinger equation. This novel approach enables us to... more
We compactify M(atrix) theory on Riemann surfaces Σ with genus g > 1. Following [1], we construct a projective unitary representation of π 1 (Σ) realized on L 2 (H), with H the upper half-plane. As a first step we introduce a suitably... more
The covariantization procedure is usually referred to the translation operator, that is the derivative. Here we introduce a general method to covariantize arbitrary differential operators, such as the ones defining the fundamental group... more
A simple algorithm, which exploits the associativity of the BCH formula, and that can be generalized by iteration, extends the remarkable simplification of the Baker-Campbell-Hausdorff (BCH) formula, recently derived by Van-Brunt and... more
Abstract: A section K on a genus g canonical curve C is identified as the key tool to prove new results on the geometry of the singular locus Theta_s of the theta divisor. The K divisor is characterized by the condition of linear... more
We study bi-Hamiltonian systems of hydrodynamic type with non-singular (semisimple) non-local bi-Hamiltonian structures and prove that such systems of hydrodynamic type are diagonalizable. Moreover, we prove that for an arbitrary... more
Supersymmetric monojets may be produced at the Large Hadron Collider by the process qg → q χ 0 1 → q χ 0 1 χ 0 1 , leading to a jet recoiling against missing transverse momentum. We discuss the feasibility and utility of the... more
In the present paper, we shall be concerned with Einstein-Finsler bundles, and study the semi-stability of them.
Let (E, F ) be a Finsler vector bundle modeled on a Minkowski space (V, f ). Then, by definition, the structure group of E is reducible to the isometry group G f of f . In this paper, we shall give a condition for a Finsler vector bundle... more
A differentiable manifold M is called a Finsler manifold if, to each point of M , a normed structure on the tangent space is associated. In the present paper, we are concerned with special Finsler manifolds, called Berwald spaces and... more
In the present paper, we shall be concerned with conformal flatness of convex Finsler structures. We introduce a complex Finsler connection and define its conformal curvature Θ. This curvature Θ is invariant by any conformal rescaling of... more
In this paper, we hall discuss the projective flatness of complex Finsler metrics by investigating the geometry of projective bundles associated with a holomorphic vector bundle.
The inclusion of higher order corrections by multi-loop diagrams is required in perturbation methods for precise theoretical calculations of high energy interactions. We address 3-loop vertex Feynman diagrams with massless internal lines,... more
How to handle the large scale computation in QFT? • Automated systems to perform perturbative calculation in QFT have been developed to handle cases beyond man-power computation. • Many systems are successfully working in tree and 1-loop... more
We present a new approach for obtaining very precise integration results for infrared vertex and box diagrams, where the integration is carried out directly without performing any analytic integration of Feynman parameters. Using an... more
Tunneling of two particles in synchronous and asynchronous regimes is studied in the framework of dissipative quantum tunneling. The critical temperature Tc corresponding to a bifurcation of the underbarrier trajectory is determined. The... more
Tunneling of two particles in synchronous and asynchronous regimes is studied in the framework of dissipative quantum tunneling. The critical temperature Tc corresponding to a bifurcation of the underbarrier trajectory is determined. The... more
The observation of 236 MeV muon neutrinos from kaon-decay-at-rest (KDAR) originating in the core of the Sun would provide a unique signature of dark matter annihilation. Since excellent angle and energy reconstruction are necessary to... more