Showing 2019 · hep-thShow all

39 papers · 2 filters

hep-th2019★ 94 cited

Extended BMS Algebra of Celestial CFT

Angelos Fotopoulos, Stephan Stieberger, Tomasz R. Taylor +1

We elaborate on the proposal of flat holography in which four-dimensional physics is encoded in two-dimensional celestial conformal field theory (CCFT). The symmetry underlying CCF…

hep-th2019★ 1 cited

On the rotator Hamiltonian for the SUSU sigma-model in the delta-regime

J. Balog, F. Niedermayer, P. Weisz

We investigate some properties of the standard rotator approximation of the SUSU sigma-model in the delta-regime. In particular we show that the isospin susceptib…

hep-th2019★ 23 cited

Conformal Invariance of the One-Loop All-Plus Helicity Scattering Amplitudes

Johannes Henn, Bláithín Power, Simone Zoia

The massless QCD Lagrangian is conformally invariant and, as a consequence, so are the tree-level scattering amplitudes. However, the implications of this powerful symmetry at loop…

hep-th2019★ 6 cited

Non-flat Universes and Black Holes in Asymptotically Free Mimetic Gravity

Ali H. Chamseddine, Viatcheslav Mukhanov, Tobias B. Russ

The recently proposed theory of "Asymptotically Free Mimetic Gravity" is extended to the general non-homogeneous, spatially non-flat case. We present a modified theory of gravity w…

hep-th2019

Winding modes and the reflection symmetry in AdS

Sergio Iguri, Nicolas Kovensky, Leila Maestri +1

We compute the contact term of the two-point function for the SL()-WZNW model in the winding sector. After reviewing some generalities of the model and its Euclidean c…

hep-th2019★ 37 cited

Infinite Black Hole Entropies at Infinite Distances and Tower of States

Quentin Bonnefoy, Luca Ciambelli, Dieter Lust +1

The aim of this paper is to elucidate a close connection between the black hole area law and the infinite distance conjecture in the context of the swampland. We consider families…

hep-th2019★ 4 cited

Handle Operators in String Theory

Dimitri Skliros, Dieter Luest

We derive how to incorporate topological features of Riemann surfaces in string amplitudes by insertions of bi-local operators called handle operators. The resulting formalism is e…

hep-th2019★ 44 cited

tension and the String Swampland

Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lust +2

[Abridged] We realize the Agrawal-Obied-Vafa (AOV) swampland proposal of fading dark matter by the model of Salam-Sezgin and its string realization of Cvetic-Gibbons-Pope. The mode…

hep-th2019★ 17 cited

Flag manifold sigma-models and nilpotent orbits

Dmitri Bykov

In the present paper we study flag manifold sigma-models that admit a zero-curvature representation. It is shown that these models may be naturally considered as interacting (holom…

hep-th2019★ 12 cited

Form factors with two operator insertions and the principle of maximal transcendentality

Taushif Ahmed, Pulak Banerjee, Amlan Chakraborty +2

We present the first calculations of two-point two-loop form factors (FFs) with a two identical operators insertion in maximally supersymmetric Yang-Mills theory. In this article,…

hep-th2019★ 19 cited

On current algebras, generalised fluxes and non-geometry

David Osten

A Hamiltonian formulation of the classical world-sheet theory in a generic, geometric or non-geometric, NSNS background is proposed. The essence of this formulation is a deformed c…

hep-th2019★ 13 cited

Entropy Counting from Schwarzschild/CFT and Soft Hair

Artem Averin

We revisit Carlip's approach to entropy counting. This analysis reemerged in a recently obtained Schwarzschild/CFT-correspondence as Sugawara-construction of a 2D stress-tensor. He…

hep-th2019★ 52 cited

Quantum Log-Corrections to Swampland Conjectures

Ralph Blumenhagen, Max Brinkmann, Andriana Makridou

Taking the anti-de Sitter minimum of KKLT and the large volume scenario at face value, we argue for the existence of logarithmic quantum corrections to AdS swampland conjectures. I…

hep-th2019★ 31 cited

Swampland, Gradient Flow and Infinite Distance

Alex Kehagias, Dieter Lust, Severin Lüst

In the first part of this paper we will work out a close and so far not yet noticed correspondence between the swampland approach in quantum gravity and geometric flow equations in…

hep-th2019★ 17 cited

Mimetic Horava Gravity

Ali H. Chamseddine, Viatcheslav Mukhanov, Tobias B. Russ

We show that the scalar field of mimetic gravity could be used to construct diffeomorphism invariant models that reduce to Horava gravity in the synchronous gauge. The gradient of…

hep-th2019★ 17 cited

The Unified Standard Model

Brage Gording, Angnis Schmidt-May

The aim of this work is to find a simple mathematical framework for our established description of particle physics. We demonstrate that the particular gauge structure, group repre…

hep-th2019★ 55 cited

Integration-by-parts reductions of Feynman integrals using Singular and GPI-Space

Dominik Bendle, Janko Boehm, Wolfram Decker +5

We introduce an algebro-geometrically motived integration-by-parts (IBP) reduction method for multi-loop and multi-scale Feynman integrals, using a framework for massively parallel…

hep-th2019★ 314 cited

AdS and the Swampland

Dieter Lust, Eran Palti, Cumrun Vafa

We study aspects of anti-de Sitter space in the context of the Swampland. In particular, we conjecture that the near-flat limit of pure AdS belongs to the Swampland, as it is neces…

hep-th2019★ 29 cited

A Note on String Excitations and the Higuchi Bound

Dieter Lust, Eran Palti

In this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is always a…

hep-th2019★ 10 cited

A Note on the dS Swampland Conjecture, Non-BPS branes and K-theory

Ralph Blumenhagen, Max Brinkmann, Andriana Makridou

We point out that the de Sitter swampland conjecture would be falsified if classical fluxed Type IIA orientifold vacua with a single non-BPS D7-brane were indeed part of the string…

hep-th2019★ 48 cited

Two-Point String Amplitudes

Harold Erbin, Juan Maldacena, Dimitri Skliros

We show that the two-point tree level amplitude in string theory in flat space is given by the standard free particle expression.

hep-th2019★ 23 cited

Para-Hermitian Geometries for Poisson-Lie Symmetric -models

Falk Hassler, Dieter Lust, Felix J. Rudolph

The doubled target space of the fundamental closed string is identified with its phase space and described by an almost para-Hermitian geometry. We explore this setup in the contex…

hep-th2019★ 27 cited

Type IIB flux vacua and tadpole cancellation

Philip Betzler, Erik Plauschinn

We consider flux vacua for type IIB orientifold compactifications and study their interplay with the tadpole-cancellation condition. As a concrete example we focus on $\mathbb T^6/…

hep-th2019★ 27 cited

Asymptotically Free Mimetic Gravity

Ali H. Chamseddine, Viatcheslav Mukhanov, Tobias Russ

The idea of "asymptotically free" gravity is implemented using a constrained mimetic scalar field. The effective gravitational constant is assumed to vanish at some limiting curvat…