On the quantum stability of type IIB orbifolds and orientifolds with Scherk–Schwarz SUSY breaking

Borunda, Mónica; Serone, Marco; Trapletti, Michele

doi:10.1016/s0550-3213(03)00040-3

Cited by 23 publications

(32 citation statements)

References 49 publications

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“…Masses then naturally arise by forming invariant linear combinations of χ and χ ′ excitations with the same mass. We then obtain two towers of orbifold eigenstates, 35) one with positive orbifold eigenvalue and the other negative. Those states with positive eigenvalue are nothing but the KK modes of χ 3 |0 R , while those with negative eigenvalue are the KK modes of χ 4 |0 R and are projected out entirely.…”

Section: The Chiral N = 1 → N = 0 Modelmentioning

confidence: 99%

“…[24][25][26][27][28]). In general, the non-supersymmetric string models which were studied were either non-supersymmetric by construction or exhibited a form of spontaneous supersymmetry breaking [2,[29][30][31][32][33][34][35][36], achieved through a stringy version of the Scherk-Schwarz mechanism [37] -indeed, potentially viable models within this class were constructed in Refs. [3,21,[38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

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Towards a nonsupersymmetric string phenomenology

2015

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Over the past three decades, considerable effort has been devoted to studying the rich and diverse phenomenologies of heterotic strings exhibiting spacetime supersymmetry. Unfortunately, during this same period, there has been relatively little work studying the phenomenologies associated with their non-supersymmetric counterparts. The primary reason for this relative lack of attention is the fact that strings without spacetime supersymmetry are generally unstable, exhibiting large one-loop dilaton tadpoles. In this paper, we demonstrate that this hurdle can be overcome in a class of tachyon-free four-dimensional string models realized through coordinate-dependent compactifications. Moreover, as we shall see, it is possible to construct models in this class whose low-lying states resemble the Standard Model (or even potential unified extensions thereof) -all without any light superpartners, and indeed without supersymmetry at any energy scale. The existence of such models thus opens the door to general studies of non-supersymmetric string phenomenology, and in this paper we proceed to discuss a variety of theoretical and phenomenological issues associated with such non-supersymmetric strings. On the theoretical side, we discuss the finiteness properties of such strings, the general characteristics of their mass spectra, the magnitude and behavior of their one-loop cosmological constants, and their interpolation properties. By contrast, on the phenomenological side, the properties we discuss are more model-specific and include their construction techniques, their natural energy scales, their particle and charge assignments, and the magnitudes of their associated Yukawa couplings and scalar masses.

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Section: The Chiral N = 1 → N = 0 Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards a nonsupersymmetric string phenomenology

2015

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“…Since supersymmetry is broken only locally, on the worldvolume of the branes, one can apply the same argument used for the radion. All such scalars Φ are expected to receive from loop corrections localized mass corrections, so that the relevant 4d effective action for the zero-mode reads: 10) where the kinetic term comes from the bulk, as in eq. (2.2), while the mass term is localized and is fixed by the string scale, up to a numerical constant c, in analogy with the radion potential (2.5).…”

Section: Radion Mass and Couplingsmentioning

confidence: 99%

Brane to bulk supersymmetry breaking and radion force at micron distances

et al. 2003

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We study mediation of supersymmetry breaking in the bulk, in models with primordial supersymmetry breaking on D-branes at the string scale, in the TeV region. We compute the gravitino and scalar masses up to one-loop level, as well as the radion coupling to matter. We find that the latter mediates a model independent force at submillimeter distances that can be tested in micro-gravity experiments for any dimensionality of the bulk. In the case of two large dimensions, our type I string framework provides an example which allows to stabilize the radion potential and determine the desired hierarchy between the string and Planck scales. * On leave of absence from CPHT, Ecole Polytechnique, UMR du CNRS 7644. † Permanent address: LPTHE, Universités de Paris VI et VII, UMR du CNRS 7589.

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“…Further development of the ScherkSchwarz mechanism in the string context was made in Refs. [36][37][38][39][40]. Progress towards phenomenology within this class has been made in Refs.…”

Section: Motivation For Studying Interpolating Modelsmentioning

confidence: 99%

Interpolations from supersymmetric to nonsupersymmetric strings and their properties

2017

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On the quantum stability of type IIB orbifolds and orientifolds with Scherk–Schwarz SUSY breaking

Cited by 23 publications

References 49 publications

Towards a nonsupersymmetric string phenomenology

Towards a nonsupersymmetric string phenomenology

Brane to bulk supersymmetry breaking and radion force at micron distances

Interpolations from supersymmetric to nonsupersymmetric strings and their properties

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