Results 101 to 110 of about 572 (144)

Phase transitions as the origin of large scale structure in the universe [PDF]

, 1988
A review of the formation of large scale structure through gravitational growth of primordial perturbations is given. This is followed by a discussion of how symmetry breaking phase transitions in the early universe might have produced the required ...
Turok, Neil, Turok, N.
core   +1 more source

Brane-World Gravity [PDF]

, 2010
The observable universe could be a 1+3-surface (the “brane”) embedded in a 1+3+d-dimensional spacetime (the “bulk”), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
Roy Maartens, Kazuya Koyama, Maartens, Roy, Koyama, Kazuya   +3 more
core   +1 more source

The physical moduli of heterotic G 2 string compactifications

Journal of High Energy Physics
In previous works, an operator was developed for heterotic compactifications on ℝ2,1 × G 2 and AdS 3 × G 2, which preserves N = 1 d = 3 supersymmetry and whose kernel is related to the moduli of the compactification. The operator is described in terms of
Jock McOrist, Martin Sticka, Eirik Eik Svanes   +2 more
doaj   +1 more source

Amplitudes on plane waves from ambitwistor strings

Journal of High Energy Physics, 2017
In marked contrast to conventional string theory, ambitwistor strings remain solvable worldsheet theories when coupled to curved background fields. We use this fact to consider the quantization of ambitwistor strings on plane wave metric and plane wave ...
Tim Adamo, Eduardo Casali, Lionel Mason, Stefan Nekovar   +3 more
doaj   +1 more source

TASI Lectures on Perturbative String Theories [PDF]

, 1996
These lecture notes are based on a course on string theories given by Hirosi Ooguri in the first week of TASI 96 Summer School at Boulder, Colorado. It is an introductory course designed to provide students with minimum knowledge before they attend more ...
Yin, Zheng, Ooguri, Hirosi
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Properties of enhançons in supergravity [PDF]

, 2003
A certain class of naked singularities, related to N = 2 pure super Yang-Mills theory, are resolved in string theory with the enhançon mechanism. We study the properties of the enhançon in supergravity.
Dimitriadis, Apostolos A.
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Toward the construction of realistic models from Superstrings [PDF]

, 2013
総合研究大学院大学博士（理学）The superstring theory has been considered as an important candidate for a fundamental theory. There exist five consistent superstring theory: type I, type IIA, type IIB, SO(32) heterotic and E8×E8 heterotic theories.
ヤタ, マサヤ, 矢田, 雅哉, YATA, Masaya   +2 more
core  

On unitarity of the hypergeometric amplitude

Journal of High Energy Physics
The hypergeometric amplitude is a one-parameter deformation of the Veneziano amplitude for four-point tachyon scattering in bosonic string theory that is consistent with S-matrix bootstrap constraints.
Gareth Mansfield, Marcus Spradlin
doaj   +1 more source

Positivity of the Veneziano amplitude in ten dimensions

Journal of High Energy Physics
The Veneziano amplitude describing the tree-level scattering of four open superstrings is expected to be consistent with unitarity in ten spacetime dimensions.
Gareth Mansfield
doaj   +1 more source

Superstrings in general backgrounds [PDF]

, 2007
In the present thesis, some aspects of superstrings in general backgrounds are studied. The thesis divides into three parts. The first is devoted to a careful study of very convenient superspace conventions which are a basic tool for the second part.
Guttenberg, Sebastian
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