Journal of High Energy Physics

http://link.springer.com/journal/13130

List of Papers (Total 12,339)

New physics in double Higgs production at future e+e− colliders

Abstract We study the effects of new physics in double Higgs production at future e+e− colliders. In the Standard Model the chiral limit (me = 0) plays an important role for this process, being responsible for the smallness of the tree-level diagrams with respect to the 1-loop contributions. In our work, we consider the possibility of an enhancement due to the contribution of...

Quantum non-linear evolution of inflationary tensor perturbations

Abstract We study the quantum mechanical evolution of the tensor perturbations during inflation with non-linear tensor interactions. We first obtain the Lindblad terms generated by non-linear interactions by tracing out unobservable sub-horizon modes. Then we calculate explicitly the reduced density matrix for the super-horizon modes, and show that the probability of maintaining...

A leading-order comparison between fluid-gravity and membrane-gravity dualities

Abstract In this note, we have compared two different perturbation techniques that are used to generate dynamical black-brane solutions to Einstein’s equations in the presence of negative cosmological constant. One is the ‘derivative expansion’, where the gravity solutions are in one-to-one correspondence with the solutions of relativistic Navier-Stokes equation. The second is...

Vertex Operator Algebras and 3d \( \mathcal{N} \) = 4 gauge theories

Abstract We introduce two mirror constructions of Vertex Operator Algebras associated to special boundary conditions in 3d \( \mathcal{N} \) = 4 gauge theories. We conjecture various relations between these boundary VOA’s and properties of the (topologically twisted) bulk theories. We discuss applications to the Symplectic Duality and Geometric Langlands programs.

Recursion relations in Witten diagrams and conformal partial waves

Abstract We revisit the problem of performing conformal block decomposition of exchange Witten diagrams in the crossed channel. Using properties of conformal blocks and Witten diagrams, we discover infinitely many linear relations among the crossed channel decomposition coefficients. These relations allow us to formulate a recursive algorithm that solves the decomposition...

Representing seesaw neutrino models and their motion in lepton flavour space

Abstract We discuss how seesaw neutrino models can be graphically represented in lepton flavour space. We examine various popular models and show how this representation helps understanding their properties and connection with experimental data showing in particular how certain texture zero models are ruled out. We also introduce a new matrix, the bridging matrix, that brings...

Symmetry protected topological phases and generalized cohomology

Abstract We discuss the classification of SPT phases in condensed matter systems. We review Kitaev’s argument that SPT phases are classified by a generalized cohomology theory, valued in the spectrum of gapped physical systems [20, 23]. We propose a concrete description of that spectrum and of the corresponding cohomology theory. We compare our proposal to pre-existing...

Properties of dyons in \( \mathcal{N} \) = 4 theories at small charges

Abstract We study three properties of 1/4 BPS dyons at small charges in string compactifications which preserve \( \mathcal{N} \) = 4 supersymmetry. We evaluate the non-trivial constant present in the one loop statistical entropy for \( \mathcal{N} \) = 4 compactifications of type IIB theory on K3 × T2 orbifolded by an order ℤN freely acting orbifold g′ including all CHL...

A very heavy sneutrino as viable thermal dark matter candidate in U(1)′ extensions of the MSSM

Abstract We study the Standard Model singlet (“right-handed”) sneutrino \( {\tilde{\nu}}_R \) dark matter in a class of U(1)′ extensions of the MSSM that originate from the breaking of the E6 gauge group. These models, which are referred to as UMSSM, contain three right-handed neutrino superfields plus an extra gauge boson Z′ and an additional SM singlet Higgs with mass ≃ MZ...

Constraints on disconnected contributions in ππ scattering

Abstract The accuracy of the lattice QCD computation of hadron-hadron scattering at low isospin depends critically on the ability to compute correlation functions with fermionic disconnected Wick contractions. This happens, for instance, in isospin I = 0 ππ scattering, which receives contributions from rectangular and vacuum types of contractions among other easier calculable...

Modular A5 symmetry for flavour model building

Abstract In the framework of the modular symmetry approach to lepton flavour, we consider a class of theories where matter superfields transform in representations of the finite modular group Γ5 ≃ A5. We explicitly construct a basis for the 11 modular forms of weight 2 and level 5. We show how these forms arrange themselves into two triplets and a quintet of A5. We also present...

p-adic CFT is a holographic tensor network

Abstract The p-adic AdS/CFT correspondence relates a CFT living on the p-adic numbers to a system living on the Bruhat-Tits tree. Modifying our earlier proposal [1] for a tensor network realization of p-adic AdS/CFT, we prove that the path integral of a p-adic CFT is equivalent to a tensor network on the Bruhat-Tits tree, in the sense that the tensor network reproduces all...

Black hole spectroscopy and AdS2 holography

Abstract We compute the spectrum of extremal nonBPS black holes in four dimensions by studying supergravity on their AdS2 × S2 near horizon geometry. We find that the spectrum exhibits significant simplifications even though supersymmetry is completely broken. We interpret our results in the framework of nAdS2/nCFT1 correspondence and by comparing with dimensional reduction from...

Holographic four-point functions in Toda field theories in AdS2

Abstract We consider Toda field theories in a classical Euclidean AdS2 background. We compute the four-point functions of boundary operators in the a1, a2 and b2 Toda field theories. They take the same form as the four-point functions of generators in the corresponding \( \mathcal{W} \)-algebras. Therefore we conjecture that the boundary operators are in one-to-one correspondence...

Poisson-Lie T-plurality revisited. Is T-duality unique?

Abstract We investigate (non-)Abelian T-duality from the perspective of Poisson-Lie T-plurality. We show that sigma models related by duality/plurality are given not only by Manin triples obtained from decompositions of Drinfel’d double, but also by their particular embeddings, i.e. maps that relate bases of these decompositions. This allows us to get richer set of dual or plural...

Spotting hidden sectors with Higgs binoculars

Abstract We explore signals of new physics with two Higgs bosons and large missing transverse energy at the LHC. Such a signature is characteristic of models for dark matter or other secluded particles that couple to the standard model through an extended scalar sector. Our goal is to provide search strategies and an interpretation framework for this new signature that are...

Gravitational resonances in mimetic thick branes

Abstract In this work, we investigate gravitational resonances in both single and double mimetic thick branes, which can provide a new way to detect the extra dimension. For the single brane model, we apply the relative probability proposed in [Phys. Rev.D 80 (2009) 065019]. For the double brane model, we investigate the resonances quasi-localized on the double brane, on the sub...

Platonic field theories

Abstract We study renormalization group (RG) fixed points of scalar field theoin order to get access to the corresponding RG beta functions, we derive general multicomponent beta functionals βV and βZ in the aforementioned upper critical dimensions, most of which are novel. The field theories we analyze have N = 2 (polygons), N = 3 (Platonic solids) and N =4 (hyper-Platonic...

Relaxing the cosmological moduli problem by low-scale inflation

Abstract We show that the cosmological abundance of string axions is much smaller than naive estimates if the Hubble scale of inflation, Hinf , is sufficiently low (but can still be much higher than the axion masses) and if the inflation lasts sufficiently long. The reason is that the initial misalignment angles of the string axions follow the Bunch-Davies distribution peaked at...

Quantum mirror curve of periodic chain geometry

Abstract The mirror curves enable us to study B-model topological strings on noncompact toric Calabi-Yau threefolds. One of the method to obtain the mirror curves is to calculate the partition function of the topological string with a single brane. In this paper, we discuss two types of geometries: one is the chain of N ℙ1’s which we call “N-chain geometry,” the other is the...

The c = 1 string theory S-matrix revisited

Abstract We revisit the perturbative S-matrix of c = 1 string theory from the worldsheet perspective. We clarify the origin of the leg pole factors, the non-analyticity of the string amplitudes, and the validity as well as limitations of earlier computations based on resonance momenta. We compute the tree level 4-point amplitude and the genus one 2-point reflection amplitude by...

Two-field cosmological α-attractors with Noether symmetry

Abstract We study Noether symmetries in two-field cosmological α-attractors, investigating the case when the scalar manifold is an elementary hyperbolic surface. This encompasses and generalizes the case of the Poincaré disk. We solve the conditions for the existence of a ‘separated’ Noether symmetry and find the form of the scalar potential compatible with such, for any...

Complexity of holographic superconductors

Abstract We study the complexity of holographic superconductors (Einstein-Maxwell-complex scalar actions in d + 1 dimension) by the “complexity = volume” (CV) conjecture. First, it seems that there is a universal property: the superconducting phase always has a smaller complexity than the unstable normal phase below the critical temperature, which is similar to a free energy. We...

Jet veto resummation with jet rapidity cuts

Abstract Jet vetoes are widely used in experimental analyses at the LHC to distinguish different hard-interaction processes. Experimental jet selections require a cut on the (pseudo)rapidity of reconstructed jets, |ηjet| ≤ ηcut. We extend the standard jet-pT (jet-veto) resummation, which implicitly works in the limit ηcut → ∞, by incorporating a finite jet rapidity cut. We also...

Modular graph functions and odd cuspidal functions. Fourier and Poincaré series

Abstract Modular graph functions are SL(2, ℤ)-invariant functions associated with Feynman graphs of a two-dimensional conformal field theory on a torus of modulus τ. For one-loop graphs they reduce to real analytic Eisenstein series. We obtain the Fourier series, including the constant and non-constant Fourier modes, of all two-loop modular graph functions, as well as their...