Results 71 to 80 of about 618 (129)

A Lightning Introduction to String Theory [PDF]

We give a lightning introduction to critical string theory, including the 26-dimensional bosonic string, the 10-dimensional superstrings and heterotic strings with and without spacetime supersymmetry. We also discuss open strings and D-branes, as well as
Angelantonj, Carlo, Florakis, Ioannis
core   +1 more source

Eigenvalue equation for the modular graph C a,b,c,d

Journal of High Energy Physics, 2019
The modular graph C a,b,c,d on the torus is a three loop planar graph in which two of the vertices have coordination number four, while the others have coordination number two. We obtain an eigenvalue equation satisfied by C a,b,c,d for generic values of
Anirban Basu
doaj   +1 more source

Completing R 4 using O(d, d)

Journal of High Energy Physics, 2022
The tree-level string effective action is known to contain quartic Riemann terms with coefficient ζ(3)α′3. In the case of the type II string this is the first α′ correction.
Linus Wulff
doaj   +1 more source

Heterotic Braneworld Gravity [PDF]

, 2009
In the past decade, there has been considerable interest in braneworld scenarios where the universe lives on a brane in a higher-dimensional bulk and gravity is modified.
LEKSONO, FITRI,ARMALIVIA
core  

A relation between tree amplitudes of closed and open strings

, 1986
We derive a formula which expresses any closed string tree amplitude in terms of a sum of the products of appropriate open string tree amplitudes. This formula is applicable to the heterotic string as well as to the closed bosonic string and type II ...
Tye, S. H.H., Kawai, H., Lewellen, D. C.
core   +1 more source

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

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, Piotr Tourkine, Pierre Vanhove   +2 more
doaj   +1 more source

Superstring amplitudes from BCJ numerators at one loop

Journal of High Energy Physics
We find a direct map that determines moduli-space integrands for one-loop superstring amplitudes in terms of field-theory loop integrands in the BCJ form. The latter can be computed using efficient unitarity methods, so our map provides an alternative to
Yvonne Geyer, Jiachen Guo, Ricardo Monteiro, Lecheng Ren   +3 more
doaj   +1 more source

Bosonic construction of superstring theory and related topics [PDF]

, 2002
This thesis splits into two parts. In the first part we introduce a bosonic construction of the ten-dimensional fermionic theories. This construction relies on a consistent truncation procedure which can produce fermions out of bosons. We illustrate this
Chattaraputi, A., Chattaraputi Auttakit, Chattaraputi, Auttakit   +2 more
core  

Superstring amplitudes from the field-theory limit: an n-point map at one loop

Journal of High Energy Physics
Are perturbative superstring amplitudes for massless external states just an α ′ dressing of super-Yang-Mills/supergravity? This is the case at tree level, where the worldsheet correlators at n points can be written in a natural worldsheet basis, such ...
Ricardo Monteiro, Lecheng Ren
doaj   +1 more source