Results 31 to 40 of about 5,095 (92)
Modular graph functions and odd cuspidal functions. Fourier and Poincaré series
Journal of High Energy Physics, 2019 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,
Eric D’Hoker, Justin Kaidi
doaj +1 more source
Journal of High Energy Physics, 2022 In this paper we consider non-commutativity that arises from T-duality of bosonic coordinates of type II superstring in presence of coordinate dependent Ramond-Ramond field. Action with such choice of the background fields is not translational invariant.
D. Obrić, B. Nikolić
doaj +1 more source
Dilaton vertices of the closed superstring and the heterotic string
Physics Letters B, 1988 Abstract BRST - and conformally invariant dilaton vertices of the closed superstring and the heterotic string are constructed, whose counter terms are consistent with the dilaton terms introduced in the non-linear sigma model approach of string theory.
openaire +1 more source
, 1996 Recent developments in string duality suggest that the string scale may not be irrevocably tied to the Planck scale. Two explicit but unrealistic examples are described where the ratio of the string scale to the Planck scale is arbitrarily small ...
A. Sagnotti +25 more
core +2 more sources
On the existence of heterotic-string and type-II-superstring field theory vertices
Journal of Geometry and PhysicsWe consider two problems associated to the space of Riemann surfaces that are closely related to string theory. We first consider the problem of existence of heterotic-string and type-II-superstring field theory vertices in the product of spaces of bordered surfaces parameterizing left- and right-moving sectors of these theories. It turns out that this
Seyed Faroogh Moosavian, Yehao Zhou
openaire +2 more sources
Revisiting noninteracting string partition functions in Rindler space [PDF]
, 2016 We revisit non-interacting string partition functions in Rindler space by summing over fields in the spectrum. In field theory, the total partition function splits in a natural way in a piece that does not contain surface terms and a piece consisting of ...
Mertens, Thomas G. +2 more
core +3 more sources
One-loop monodromy relations on single cuts
Journal of High Energy Physics, 2017 The discovery of colour-kinematic duality has led to significant progress in the computation of scattering amplitudes in quantum field theories. At tree level, the origin of the duality can be traced back to the monodromies of open-string amplitudes ...
Alexander Ochirov +2 more
doaj +1 more source
New BPS states from bosonic/heterotic duality
Journal of High Energy PhysicsIn this paper, we consider the recently proposed bosonic/heterotic duality that relates the heterotic superstrings to the noncritical bosonic string. Although the latter is nonsupersymmetric, it can be viewed as pseudo-supersymmetric in that the theory ...
Kai-Peng Lu, H. Lü, Liang Ma
doaj +1 more source
Integrating three-loop modular graph functions and transcendentality of string amplitudes
Journal of High Energy Physics, 2022 Modular graph functions (MGFs) are SL(2, ℤ)-invariant functions on the Poincaré upper half-plane associated with Feynman graphs of a conformal scalar field on a torus.
Eric D’Hoker, Nicholas Geiser
doaj +1 more source
Introduction to branes and M-theory for relativists and cosmologists
, 2002 We review the recent developments in superstrings. We start with a brief summary of various consistent superstring theories and discuss T-duality which necessarily leads to the presence of D-branes.
Ohta, Nobuyoshi
core +1 more source