Four-Dimensional Superstrings

Antoniadis, I.

doi:10.1016/b978-0-444-87492-4.50026-4

Cited by 56 publications

(161 citation statements)

References 18 publications

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“…When both radii are at the fermionic radius, each of the left-moving bosons X 0 L and X 1 L is equivalent to two leftmoving real fermions. Together with ψ 0 and ψ 1 , these generate an SO(4) L ∼ SU(2) 2 × SU(2) 2 current algebra on the left side of the world-sheet [20][21][22][23]. Similarly we have a right-moving (2) 2 current algebra.…”

Section: The Closed String Sectormentioning

confidence: 99%

Resolution of Hagedorn singularity in superstrings with gravito-magnetic fluxes

Angelantonj

Kounnas²,

Partouche³

et al. 2009

Nuclear Physics B

124

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We consider closed type II and orientifold backgrounds where supersymmetry is spontaneously broken by asymmetric geometrical fluxes. We show that these can be used to describe thermal ensembles with chemical potentials associated to "gravito-magnetic" fluxes. The thermal free energy is computed at the one-loop string level, and it is shown to be free of the usual Hagedorn-like instabilities for a certain choice of the chemical potentials. In the closed string gravitational sector, as well as in the open string matter sector of the proposed orientifold construction, the free energy turns out to have "Temperature duality" symmetry, F (T /T H ) = F (T H /T ), which requires interchanging the space-time spinor representations S ↔ C. For small temperatures, T → 0, the anti-spinor C decouples from the spectrum while for large temperatures, T → ∞, the spinor S decouples. In both limits the free energy vanishes, as we recover a conventional type II superstring theory. At the self dual point T = T H , the thermal spectra of S and C are identical. At this point there are extra massless scalars in the adjoint representation of an SO(4) non-Abelian gauge symmetry group arising from the closed-string sector.

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Section: The Closed String Sectormentioning

confidence: 99%

Resolution of Hagedorn singularity in superstrings with gravito-magnetic fluxes

Angelantonj

Kounnas²,

Partouche³

et al. 2009

Nuclear Physics B

124

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show abstract

“…In this context the background geometry in which the string propages is replaced by a two-dimensional field theory on the worldsheet, that is highly constrained by (super-) conformal invariance as well invariance under large (super-) reparametrizations at all genera (modular invariance). Early examples of CFT constructions were given in terms of bosonic covariant lattices [3,4], fermionic constructions [5,6], Gepner models [7] as well as symmetric [8,9] and asymmetric [10,11] orbifold CFT's. At length scales sufficiently larger than the string length, it is indeed sometimes possible to recover a geometric interpretation of the CFT constructions, e.g.…”

Section: Introductionmentioning

confidence: 99%

Gauged supergravities and non-geometric Q/R-fluxes from asymmetric orbifold CFT’s

Condeescu

Florakis

Kounnas

et al. 2013

J. High Energ. Phys.

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Abstract:We investigate the orbifold limits of string theory compactifications with geometric and non-geometric fluxes. Exploiting the connection between internal fluxes and structure constants of the gaugings in the reduced supergravity theory, we can identify the types of fluxes arising in certain classes of freely-acting symmetric and asymmetric orbifolds. We give a general procedure for deriving the gauge algebra of the effective gauged supergravity using the exact CFT description at the orbifold point. We find that the asymmetry is, in general, related to the presence of non-geometric Q-and R-fluxes. The action of T-duality is studied explicitly on various orbifold models and the resulting transformation of the fluxes is derived. Several explicit examples are provided, including compactifications with geometric fluxes, Q-backgrounds (T-folds) and R-backgrounds. In particular, we present an asymmetric Z 4 × Z 2 orbifold in which all geometric and nongeometric fluxes ω, H, Q, R are turned on simultaneously. We also derive the corresponding flux backgrounds, which are not in general T-dual to geometric ones, and may even simultaneously depend non-trivially on both the coordinates and their winding T-duals.

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“…It is non-perturbative consistency (see the following section) which requires that w 1 = 0, and forbids 7 the existence of "stuck" D8-branes and of SO(2k + 1) gauge groups in T 2 compactifications [13]. In the heterotic theory the vanishing of w 1 is a perturbative requirement, which follows from multiloop modular invariance [41]. A geometric interpretation of an analogous obstruction for D7-branes stuck on an O7-plane in IIB orientifolds has recently appeared in [42].…”

Section: Jhep08(2008)016mentioning

confidence: 99%

Comments on orientifolds without vector structure

Bachas

Bianchi

Blumenhagen

et al. 2008

J. High Energy Phys.

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We revisit type I compactifications with a Spin(32)/Z 2 gauge bundle that admits no vector structure. We elucidate the relation of this Z 2 obstruction to discrete Bfield flux and to 't Hooft flux and clarify some subtleties in the T-duality transformation to type IIA intersecting D-brane models. We reexamine the earliest 3-generation GUT model on magnetized D-branes and show its consistency when a discrete B-flux is switched on. We further generalize partially known results for toroidal models to type I compactifications without vector structure and their mirror dual type IIA orientifolds on genuine Calabi-Yau manifolds. We illustrate this by working out the example of the quintic in some detail.

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Four-Dimensional Superstrings

Cited by 56 publications

References 18 publications

Resolution of Hagedorn singularity in superstrings with gravito-magnetic fluxes

Resolution of Hagedorn singularity in superstrings with gravito-magnetic fluxes

Gauged supergravities and non-geometric Q/R-fluxes from asymmetric orbifold CFT’s

Comments on orientifolds without vector structure

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