String propagation in gravitational wave backgrounds

Kiritsis, Elias; Kounnas, Costas

doi:10.1016/0370-2693(94)90655-6

Cited by 106 publications

(267 citation statements)

References 29 publications

(27 reference statements)

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“…This is a manifestation of the underlying Scherk-Schwarz mechanism responsible for the spontaneous breaking of the N = 4 supersymmetry. The same conclusion can be reached by analysing the behaviour of the (T -and U-dependent) mass of the two gravitinos (see [2] and [21]). For λ = 0 ground states, there are two inequivalent limits in the (T, U) moduli where the masses of both gravitinos either vanish or become infinite.…”

Section: Decompactification Limits and Restoration Of N = 4 Supersymmsupporting

confidence: 59%

“…In Ref. [2] it was shown that there are perturbative heterotic ground states where supersymmetry is spontaneously broken from N = 2 down to N = 1, which possess a chiral four-dimensional spectrum. This opens more possibilities in string model-building, and obviously a more careful investigation is required when N > 1 is spontaneously broken to chiral N = 1 models.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of Λ N (including Λ N =1 ) can be either perturbative or non-perturbative [2]. The recent remarkable progress in understanding the non-perturbative structure of string theories gives us the possibility to study some of the non-perturbative aspects of partial breaking at scales Λ N , by performing perturbative calculations in dual string theories.…”

Section: Introductionmentioning

confidence: 99%

“…The low-energy behaviour of the couplings of these two classes is markedly different. In the non-freely-acting case (explicit breaking) [8]- [20], the low-energy theory has no memory of the original supersymmetry, while in the freelyacting case (spontaneous breaking) it does [2]. This was verified by explicit calculation in several classes of ground states with spontaneously-broken supersymmetry: N = 4 to N = 2 [21], N = 8 to N = 6 [22] as well as N = 8 to N = 3 [23]; furthermore the non-perturbative aspects of this problem have been studied utilizing the heterotic/type II duality [2,24].…”

Section: Introductionmentioning

confidence: 99%

“…Since the heterotic string on T 6 is dual (via S ↔ T interchange) to the type II string on K3 × T 2 , freely orbifolding both sides will produce a new dual pair. In [2] heterotic/type II duality was utilized to study some aspects of this problem. In particular, it was shown that heterotic ground states with N = 4 supersymmetry spontaneously broken to N = 2 and massive gravitinos in the perturbative spectrum are sometimes dual to type II models without massive gravitinos in the perturbative spectrum.…”

Section: Introductionmentioning

confidence: 99%

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String threshold corrections in models with spontaneously broken supersymmetry

et al. 1999

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We analyse a class of four-dimensional heterotic ground states with N = 2 space-time supersymmetry. From the ten-dimensional perspective, such models can be viewed as compactifications on a six-dimensional manifold with SU(2) holonomy, which is locally but not globally K3 × T 2 . The maximal N = 4 supersymmetry is spontaneously broken to N = 2. The masses of the two massive gravitinos depend on the (T, U) moduli of T 2 . We evaluate the one-loop threshold corrections of gauge and R 2 couplings and we show that they fall in several universality classes, in contrast to what happens in usual K3 × T 2 compactifications, where the N = 4 supersymmetry is explicitly broken to N = 2, and where a single universality class appears. These universality properties follow from the structure of the elliptic genus. The behaviour of the threshold corrections as functions of the moduli is analysed in detail: it is singular across several rational lines of the T 2 moduli because of the appearance of extra massless states, and suffers only from logarithmic singularities at large radii. These features differ substantially from the ordinary K3 × T 2 compactifications, thereby reflecting the existence of spontaneously-broken N = 4 supersymmetry. Although our results are valid in the general framework defined above, we also point out several properties, specific to orbifold constructions, which might be of phenomenological relevance.

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Section: Decompactification Limits and Restoration Of N = 4 Supersymmsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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String threshold corrections in models with spontaneously broken supersymmetry

et al. 1999

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The symmetric branes of the H₄ WZW model

D’Appollonio

2005

Fortschritte der Physik

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We review the solution of the boundary CFTs that describe the symmetric branes in the Nappi-Witten gravitational wave, namely D2 and S1 branes. The D2 branes are the twisted branes of the model while the S1 branes are the Cardy branes. We present in both cases the bulk-boundary couplings and the boundary three-point couplings and discuss the relation with branes in AdS 3 and in S 3 . We also discuss the analogy between the open string couplings in the H 4 model and the couplings for magnetized and intersecting branes.

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Closed Strings in Misner Space: A Toy Model for a Big Bounce?

Durin

Pioline

2005

String Theory: From Gauge Interactions to Cosmology

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Misner space, also known as the Lorentzian orbifold R 1,1 /boost, is one of the simplest examples of a cosmological singularity in string theory. In this lecture, we review the semi-classical propagation of closed strings in this background, with a particular emphasis on the twisted sectors of the orbifold. Tree-level scattering amplitudes and the one-loop vacuum amplitude are also discussed.Thus I was moving along the sloping curve of the time loop towards that place in which the Friday me before the beating would change into the Friday me already beaten. I. Tichy, [1]Despite their remarkable success in explaining a growing body of high precision cosmological data, inflationary models, just as the Hot Big Bang Model, predict an Initial Singularity where effective field theory ceases to be valid [2]. As a quantum theory of gravity, String Theory ought to make sense even in this strongly curved regime, possibly by providing an initial quantum state if the Initial Singularity is truely an Origin of Time, or by escaping it altogether if stringy matter turns out to be less prone to gravitational collapse than conventional field-theoretic matter. Unfortunately, describing cosmological singularities and, less ambitiously, time dependence in string theory has been *

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String propagation in gravitational wave backgrounds

Cited by 106 publications

References 29 publications

String threshold corrections in models with spontaneously broken supersymmetry

String threshold corrections in models with spontaneously broken supersymmetry

The symmetric branes of the H₄ WZW model

Closed Strings in Misner Space: A Toy Model for a Big Bounce?

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String propagation in gravitational wave backgrounds

Cited by 106 publications

References 29 publications

String threshold corrections in models with spontaneously broken supersymmetry

String threshold corrections in models with spontaneously broken supersymmetry

The symmetric branes of the H4 WZW model

Closed Strings in Misner Space: A Toy Model for a Big Bounce?

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Product

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The symmetric branes of the H₄ WZW model