Non-perturbative temperature instabilities in N = 4 strings

Antoniadis, I.; Derendinger, Jean-Pierre; Kounnas, Costas

doi:10.1016/s0550-3213(99)00171-6

Cited by 62 publications

(107 citation statements)

References 78 publications

(71 reference statements)

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“…In string theory new instabilities set in at temperatures close to the string scale, T ∼ 1/l s , the Hagedorn instabilities, which signal non-trivial phase transitions [12][13][14][15][16][17][18]. The origin of these instabilities is due to the exponential rise in the density of (single-particle) string states at large mass [11]:…”

Section: Thermal Configurations Of Type II N = (4 0) Modelsmentioning

confidence: 99%

“…Starting in the contracting phase, the Einstein frame temperature increases monotonically with time. The analysis of [17] reveals that additional thermal states become massless at a critical temperature determined by the string coupling, "protecting" the system from entering the regime a E → 0 of classical general relativity. If at this critical point the coupling is weak, then the additional thermal states are the perturbative winding modes discussed above, and the analysis of this section applies on how to follow the transition via the stringy S-branes.…”

Section: Pos(corfu2012)083mentioning

confidence: 99%

“…There are examples of singularity resolution, such as orbifold [7] and conifold singularities [8], and topology change [9,10], where the appearance of extra massless states, localized at the singularity, make it fuzzy and smooth. Non-conventional thermodynamics, with Hagedorn and black hole phases, signal a maximal temperature and non-trivial phase transitions [11][12][13][14][15][16][17][18]. Finally, there are robust examples of non-perturbative strong/weak coupling duali-ties -see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Aspects of String Cosmology

Toumbas¹,

Kounnas²

2013

Proceedings of Proceedings of the Corfu Summer Institute 2012 — PoS(Corfu2012)

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We review recent progress in string cosmology, where string dualities are applied so as to obtain complete cosmological evolutions, free of any essential singularities. Two classes of models are analyzed. The first class consists of string gas cosmologies associated to certain thermal configurations of type II N = (4, 0) models. Finite temperature is introduced along with nontrivial "gravito-magnetic" fluxes that lift the Hagedorn instabilities of the canonical ensemble and restore thermal T-duality symmetry. At a critical maximal temperature additional thermal states become massless sourcing stringy S-branes, which facilitate a bounce between the two dual, asymptotically cold phases. Unlike previous incarnations of pre-Big Bang cosmologies, the models remain perturbative throughout the cosmological evolution. The second class consists of exact solutions to classical string theory that admit a Euclidean description in terms of compact parafermionic worldsheet systems. The Euclidean target space corresponds to a non-singular, compact T-fold, which can be used to construct a normalizable Hartle-Hawking wavefunction for the cosmology.

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Section: Thermal Configurations Of Type II N = (4 0) Modelsmentioning

confidence: 99%

Section: Pos(corfu2012)083mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aspects of String Cosmology

Toumbas¹,

Kounnas²

2013

Proceedings of Proceedings of the Corfu Summer Institute 2012 — PoS(Corfu2012)

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“…[4]. One first observes that the Kähler potential does not induce any mixing between the dilaton multiplet and other chiral multiplets.…”

Section: High-temperature Heterotic Phasementioning

confidence: 99%

“…However, as we will see below, in nonperturbative supersymmetric field theories such an instability can arise from thermal dyonic modes, which behave as the odd winding string states [4]. Indeed, in theories with N = 4 supersymmetries, the BPS mass formula is determined by the central extension of the corresponding superalgebra [5]- [7] and dyonic field theory states are mapped to string winding modes [8,7].…”

Section: Introductionmentioning

confidence: 99%

Non-perturbative Supersymmetry Breaking and Finite Temperature Instabilities in N=4 Superstrings

Antoniadis

Derendinger²,

Kounnas

1999

Proceedings of Corfu Summer Institute on Elementary Particle Physics — PoS(corfu98)

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We obtain the non-perturbative effective potential for the dual five-dimensional N = 4 strings in the context of finite-temperature regarded as a breaking of supersymmetry into four space-time dimensions. Using the properties of gauged N = 4 supergravity we derive the universal thermal effective potential describing all possible high-temperature instabilities of the known N = 4 superstrings. These strings undergo a high-temperature transition to a new phase in which five-branes condense. This phase is described in detail, using both the effective supergravity and non-critical string theory in six dimensions. In the new phase, supersymmetry is perturbatively restored but broken at the non-perturbative level.

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Supergravity gaugings and moduli superpotentials

Derendinger

2006

Fortschritte der Physik

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These lecture notes describe the method of N = 4 supergravity gaugings used as a four-dimensional effective Lagrangian description of the moduli superpotentials generated by superstring vacua with fluxes. 367of compactifications with fluxes in many classes of superstring backgrounds. 1 This approach of the moduli problem is not the subject of the present notes.The second approach uses four-dimensional effective Lagrangians. The idea underlying the effective field theory method is to translate the known properties, and in particular the symmetry content, of the underlying fundamental theory into constraints on a field theory description of the light (four-dimensional) modes only. This effective field theory is then a tool to investigate various aspects of the expected low-energy physics predicted by the fundamental theory. It is also used to isolate the situations relevant to phenomenology and then the classes of vacua deserving a full-fledged, ten-dimensional study. The effective Lagrangian approach can be viewed as a bottom-up approach, in contrast to the top-down method provided by direct studies of compactifications with fluxes in classes of string vacua.Superstring vacua relevant to phenomenology have sixteen supercharges. This large class of solutions includes in particular heterotic (and type I) strings and type II orientifolds. In four dimensions, sixteen supercharges lead to N = 4 supergravity coupled to the N = 4 super-Yang-Mills system. This theory has a severely restricted structure. The sigma-model defining its scalar sector is for instance unique. In fact, the only freedom to introduce parameters in N = 4 supergravity resides in the choice of gauging applied to its vector fields and multiplets. Hence, a gauged N = 4 supergravity treatment of the massless modes of superstring compactifications, supplemented with a breaking mechanism to N = 1 for potentially realistic compactifications, seems an appropriate starting point for an effective Lagrangian description of string compactifications: it is expected that the gauging parameters of the effective N = 4 supergravity theory encode the data of underlying string vacua, including non-trivial fluxes. This approach of N = 4 supergravity gaugings used for the derivation and study of moduli superpotentials has been developed in [6] 2 , and expanded to the inclusion of non-perturbative gaugino condensates in [8].The purpose of the present notes 3 is to describe the method of supergravity gaugings in relation with the effective description of string moduli physics. They do not however discuss the application of the method to the study of specific physics problems or classes of compactifications with fluxes. The next four sections describe in general terms various aspects of field theory and supergravity gaugings, starting with elementary considerations. After a detailed discussion of the relevant aspects of N = 4 supergravity (Sect. 6), the specific use of N = 4 supergravity gaugings to describe moduli effective supergravities is the subject of sections 7, whic...

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Non-perturbative temperature instabilities in N = 4 strings

Cited by 62 publications

References 78 publications

Aspects of String Cosmology

Aspects of String Cosmology

Non-perturbative Supersymmetry Breaking and Finite Temperature Instabilities in N=4 Superstrings

Supergravity gaugings and moduli superpotentials

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