505 citations · 2k across the 70 of their papers we have counts for
69 papers · 1 filter
Bulk Landau Pole and Unitarity of Dual Conformal Field Theory
Ivo Sachs, Pierre Vanhove
The singlet sector of the -model in AdS at large-, gives rise to a dual conformal field theory on the conformal boundary of AdS, which is a deformation of th…
Spin fields for the spinning particle
E. Boffo, I. Sachs
We propose an analogue of spin fields for the relativistic RNS-particle in 4 dimensions, in order to describe Ramond-Ramond states as "two-particle" excitations on the world line.…
Analytical evaluation of cosmological correlation functions
T. Heckelbacher, I. Sachs, E. Skvortsov +1
Using the Schwinger-Keldysh-formalism, reformulated in arXiv:2108.01695 as an effective field theory in Euclidean anti-de Sitter, we evaluate the one-loop cosmological four-point f…
Dark Energy and the Spinning Superparticle
Daniel Bockisch, Ivo Sachs
We revisit the theory of background fields constructed on the BRST-algebra of a spinning particle with worldline supersymmetry, whose spectrum contains the graviton…
Analytical evaluation of AdS Witten diagrams as flat space multi-loop Feynman integrals
Till Heckelbacher, Ivo Sachs, Evgeny Skvortsov +1
We describe a systematic approach for the evaluation of Witten diagrams for multi-loop scattering amplitudes of a conformally coupled scalar -theory in Euclidean AdS, by r…
Proca Theory from the Spinning Worldline
Matthias Carosi, Ivo Sachs
We obtain Proca field theory from the quantisation of the supersymmetric worldline upon supplementing the graded BRST-algebra with an extra multiplet of oscillators…
QFT with Stubs
Christoph Chiaffrino, Ivo Sachs
The BV-Laplacian in quantum field theory is singular, by construction, but can be regularized by deforming the classical BV-action. Taking inspiration from string theory we des…
A toy model for background independent string field theory
Maxim Grigoriev, Adiel Meyer, Ivo Sachs
We study gauge theories of background fields associated to BRST quantized spinning particle models and identify background-independent algebraic structures which allow to systemati…
On deformations and extensions of
Martin Enriquez-Rojo, Tomáš Procházka, Ivo Sachs
We investigate the algebra of vector fields on the sphere. First, we find that linear deformations of this algebra are obstructed under reasonable conditions. In particular, we sho…
Quantum probing of null-singularities
Ivo Sachs, Marc Schneider, Maximilian Urban
We adapt the dual-null foliation to the functional Schrödinger representation of quantum field theory and study the behavior of quantum probes in plane-wave space-times near the nu…
Loops in dS/CFT
Till Heckelbacher, Ivo Sachs
We consider the semi-classical expansion of the Bunch-Davies wavefunction with future boundary condition in position space for a real scalar field, conformally coupled to a classic…
A Worldline Theory for Supergravity
Roberto Bonezzi, Adiel Meyer, Ivo Sachs
The supersymmetric spinning particle admits several consistent quantizations, related to the gauging of different subgroups of the -symmetry on the worldline…
Homotopy Algebras in String Field Theory
Ivo Sachs
Homotopy algebra and its involutive generalisation plays an important role in the construction of string field theory. I will review recent progress in these applications of homoto…
On Finite-Size D-Branes in Superstring Theory
Luca Mattiello, Ivo Sachs
We test exact marginality of the deformation describing the blow-up of a zero-size D(-1) brane bound to a background of D3-branes by analyzing the equations of motion of superstrin…
On Non-Perturbative Unitarity in Gravitational Scattering
Ivo Sachs, Tung Tran
We argue that the tree-level graviton-scalar scattering in the Regge limit is unitarized by non-perturbative effects within General Relativity. At Planckian energy the back reactio…
Einstein gravity from the spinning particle
Roberto Bonezzi, Adiel Meyer, Ivo Sachs
We obtain a manifestly background independent BRST quantization of the supersymmetric spinning particle. We show that nilpotency of the BRST charge implies the Einstein…
Classical Open String Amplitudes and Boundary String Field Theory
Christoph Chiaffrino, Ivo Sachs
Abstract: We show that boundary string field theory realizes the minimal model of open string field theory. More precisely, we observe that the expansion of the (co)homological vec…
Loops in Anti-de Sitter Space
Igor Bertan, Ivo Sachs
We obtain analytic results for the four-point amplitude, at one loop, of an interacting scalar field theory in four-dimensional, Euclidean anti-de Sitter space without exerting any…
boundary twist fields and the moduli space of D-branes
Luca Mattiello, Ivo Sachs
We revisit the boundary conformal field theory of twist fields. Based on the equivalence between twisted bosons on a circle and the orbifold theory at the critical radius, we provi…
Complete superspace classification of three-dimensional Chern-Simons-matter theories coupled to supergravity
Frederik Lauf, Ivo Sachs
For extended supersymmetry we classify all possible gauge groups for a scalar multiplet allowed by the algebras of global and local supersymmetry in three dimen…
One Loop Tadpole in Heterotic String Field Theory
Theodore Erler, Sebastian Konopka, Ivo Sachs
We compute the off-shell 1-loop tadpole amplitude in heterotic string field theory. With a special choice of cubic vertex, we show that this amplitude can be computed exactly. We o…
Minimal topologically massive supergravity
Sergei M. Kuzenko, Joseph Novak, Ivo Sachs
Using the superconformal framework, we construct a new off-shell model for topologically massive supergravity which is minimal in the sense that it makes use of a single…
On Topologically Massive Gravity with Extended Supersymmetry
Frederik Lauf, Ivo Sachs
We describe the construction of -dimensional toplogically massive adS gravity with -extended supersymmetry in superspace by means of introducing a compensating…
Open Superstring Field Theory on the Restricted Hilbert Space
Sebastian Konopka, Ivo Sachs
Recently an action for open superstring field theory was proposed where the Neveu-Schwarz sector is formulated in the large Hilbert space while the Ramond sector lives in a restric…