Results 71 to 80 of about 5,095 (92)

Fermionic one-loop amplitudes of the RNS superstring

Journal of High Energy Physics, 2018
We investigate massless n-point one-loop amplitudes of the open RNS superstring with two external fermions and determine their worldsheet integrands.
Seungjin Lee, Oliver Schlotterer
doaj   +1 more source

Connecting the ambitwistor and the sectorized heterotic strings

Journal of High Energy Physics, 2017
The sectorized description of the (chiral) heterotic string using pure spinors has been misleadingly viewed as an infinite tension string. One evidence for this fact comes from the tree level 3-point graviton amplitude, which we show to contain the usual
Thales Azevedo, Renann Lipinski Jusinskas   +1 more
doaj   +1 more source

Heterotic instantons for monad and extension bundles

Journal of High Energy Physics, 2020
We consider non-perturbative superpotentials from world-sheet instantons wrapped on holomorphic genus zero curves in heterotic string theory. These superpotential contributions feature prominently in moduli stabilization and large field axion inflation ...
Evgeny I. Buchbinder, Andre Lukas, Burt A. Ovrut, Fabian Ruehle   +3 more
doaj   +1 more source

M-Phenomenology [PDF]

, 1997
Recent developments involving strongly coupled superstrings are discussed from a phenomenological point of view. In particular, strongly coupled $E_8\times E'_8$ is described as an appropriate long-wavelength limit of M-theory, and some generic ...
Nanopoulos, D. V.
core   +2 more sources

Introduction to the special issue dedicated to Michael J. Duff FRS on the occasion of his 70th birthday. [PDF]

Proc Math Phys Eng Sci, 2022
Borsten L, Marrani A, Pope CN, Stelle K.
europepmc   +1 more source

2-Group Symmetries of 6D Little String Theories and T-Duality. [PDF]

Ann Henri Poincare, 2021
Del Zotto M, Ohmori K.
europepmc   +1 more source

Recent Developments in String Theory [PDF]

, 1997
After briefly reviewing basic concepts of perturbative string theory, we explain in simple terms some of the new findings that created excitement among the string physicists.
Lerche, W.
core   +1 more source

Compactification of D=11 supergravity on spaces of exceptional holonomy

, 1995
We investigate the compactification of D=11 supergravity to D=5,4,3, on compact manifolds of holonomy $SU(3)$ (Calabi-Yau), $G_2$, and $Spin(7)$, respectively, making use of examples of the latter two cases found recently by Joyce. In each case the lower
Awada, Bagger, Bergshoeff, Bergshoeff, Bonan, Candelas, Candelas, Cremmer, Duff, Duff, Duff, Duff, Ferrara, G. Papadopoulos, Gates, Gibbons, Ginsparg, Green, Green, Green, Grisaru, Grisaru, Günaydin, Günaydin, Günaydin, Günaydin, Günaydin, Güven, Harvey, Howe, Howe, Howe, Howe, Howe, Hull, Kachru, Klemm, Narain, Narain, P.K. Townsend, Sen, Shatashvili, Sierra, Strominger, Townsend, Townsend, Vafa, Witten, Witten   +48 more
core   +2 more sources

Upper bound on the Atiyah-Singer index from tadpole cancellation

Journal of High Energy Physics
We propose an upper bound on the Atiyah-Singer index in the effective action of string theory. For E 8 × E 8 ′ $$ {E}_8^{\prime } $$ and SO(32) heterotic string theories on smooth Calabi-Yau threefolds with line bundles, we find that the tadpole ...
Keiya Ishiguro, Takafumi Kai, Satsuki Nishimura, Hajime Otsuka, Maki Takeuchi   +4 more
doaj   +1 more source

The cohomology of superspace, pure spinors and invariant integrals

, 2008
The superform construction of supersymmetric invariants, which consists of integrating the top component of a closed superform over spacetime, is reviewed.
A. Galperin, A.P. Isaev, A.P. Isaev, B.E.W. Nilsson, J.M. Drummond, J.M. Drummond, K. Lechner, M. Cederwall, M. Cederwall, M. Cederwall, M. Cederwall, M. Cederwall, N Berkovits, N. Berkovits, N. Berkovits, N. Berkovits, N. Berkovits, N. Berkovits, N. Berkovits, P. Fré, P. Fré, P.A. Grassi, P.S Howe, P.S. Howe, P.S. Howe, P.S. Howe, P.S. Howe, R. D'Auria, S.J. Gates Jr., S.J. Gates Jr., T. Biswas   +30 more
core   +1 more source