A duality for the S matrix
AbstractWe propose a dual formulation for the S Matrix of \( \mathcal N \) = 4 SYM. The dual provides a basis for the “leading singularities” of scattering amplitudes to all orders in perturbation...
View ArticleThe Grassmannian origin of dual superconformal invariance
AbstractA dual formulation of the S Matrix for \( \mathcal {N} \) = 4 SYM has recently been presented, where all leading singularities of n-particle Nk−2MHV amplitudes are given as an integral over the...
View ArticleGoldstini
AbstractSupersymmetric phenomenology has been largely bound to the hypothesis that supersymmetry breaking originates from a single source. In this paper, we relax this underlying assumption and...
View ArticleOn-shell recursion relations for generic theories
AbstractWe show that on-shell recursion relations hold for tree amplitudes in generic two derivative theories in an arbitrary number of dimensions with multiple particle species and diverse spins. For...
View ArticleThe S-matrix in twistor space
AbstractThe marvelous simplicity and remarkable hidden symmetries recently uncovered in (Super) Yang-Mills and (Super)Gravity scattering amplitudes strongly suggests the existence of a “weak-weak” dual...
View ArticleLepton jets in (supersymmetric) electroweak processes
AbstractWe consider some of the recent proposals in which weak-scale dark matter is accompanied by a GeV scale dark sector that could produce spectacular lepton-rich events at the LHC. Since much of...
View ArticleAxion protection from flavor
AbstractThe QCD axion fails to solve the strong CP problem unless all explicit PQ violating, Planck-suppressed, dimension n< 10 operators are forbidden or have exponentially small coefficients. We...
View ArticleA definitive signal of multiple supersymmetry breaking
AbstractIf the lightest observable-sector supersymmetric particle (LOSP) is charged and long-lived, then it may be possible to indirectly measure the Planck mass at the LHC and provide a spectacular...
View ArticleBCFW recursion relations and string theory
AbstractWe demonstrate that all tree-level string theory amplitudes can be computed using the BCFW recursion relations. Our proof utilizes the pomeron vertex operator introduced by Brower, Polchinski,...
View ArticleSinglet portal to the hidden sector
AbstractUltraviolet physics typically induces a kinetic mixing between gauge singlets which is marginal and hence non-decoupling in the infrared. In singlet extensions of the minimal supersymmetric...
View ArticleOrigins of hidden sector dark matter I: cosmology
AbstractWe present a systematic cosmological study of a universe in which the visible sector is coupled, albeit very weakly, to a hidden sector comprised of its own set of particles and interactions....
View ArticleOrigins of hidden sector dark matter II: collider physics
AbstractWe consider a broad class of supersymmetric theories in which dark matter (DM) is the lightest superpartner (LSP) of a hidden sector that couples very weakly to visible sector fields. Portal...
View ArticleHiggs and dark matter hints of an oasis in the desert
AbstractRecent LHC results suggest a standard model (SM)-like Higgs boson in the vicinity of 125 GeV with no clear indications yet of physics beyond the SM. At the same time, the SM is incomplete,...
View ArticleProspects and blind spots for neutralino dark matter
AbstractUsing a simplified model framework, we assess observational limits and discovery prospects for neutralino dark matter, taken here to be a general admixture of bino, wino, and Higgsino....
View ArticleSymmetries, sum rules and constraints on effective field theories
AbstractUsing unitarity, analyticity and crossing symmetry, we derive universal sum rules for scattering amplitudes in theories invariant under an arbitrary symmetry group. The sum rules relate the...
View ArticleBlack holes and the double copy
AbstractRecently, a perturbative duality between gauge and gravity theories (the double copy) has been discovered, that is believed to hold to all loop orders. In this paper, we examine the...
View ArticleInfrared consistency and the weak gravity conjecture
AbstractThe weak gravity conjecture (WGC) asserts that an Abelian gauge theory coupled to gravity is inconsistent unless it contains a particle of charge q and mass m such that q≥m/mPl. This criterion...
View ArticleSimple recursion relations for general field theories
AbstractOn-shell methods offer an alternative definition of quantum field theory at tree-level, replacing Feynman diagrams with recursion relations and interaction vertices with a handful of seed...
View ArticlePositive signs in massive gravity
AbstractWe derive new constraints on massive gravity from unitarity and analyticity of scattering amplitudes. Our results apply to a general effective theory defined by Einstein gravity plus the...
View ArticleTwofold symmetries of the pure gravity action
AbstractWe recast the action of pure gravity into a form that is invariant under a twofold Lorentz symmetry. To derive this representation, we construct a general parameterization of all theories...
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