Conifold cosmologies in IIA string theory

Mohaupt, Thomas; Saueressig, Frank

doi:10.1002/prop.200510213

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…Examples include gases of wrapped strings and branes (see [16,17,18,19] and references within), blackhole attractors [20], D-brane systems [21], and cosmologies involving conifold and flop transitions, e.g., [22]. Despite these elegant ideas for stabilizing moduli, a detailed analysis shows that initial conditions play a crucial role.…”

Section: Classical Approach To Trappingmentioning

confidence: 99%

Dilaton dynamics from production of tensionless membranes

Cremonini

Watson

2006

Phys. Rev. D

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In this paper we consider classical and quantum corrections to cosmological solutions of 11D SUGRA coming from dynamics of membrane states. We first consider the supermembrane spectrum following the approach of Russo and Tseytlin for consistent quantization. We calculate the production rate of BPS membrane bound states in a cosmological background and find that such effects are generically suppressed by the Planck scale, as expected. However, for a modified brane spectrum possessing enhanced symmetry, production can be finite and significant. We stress that this effect could not be anticipated given only a knowledge of the low-energy effective theory. Once on-shell, inclusion of these states leads to an attractive force pulling the dilaton towards a fixed point of S-duality, namely g s = 1. Although the SUGRA description breaks down in this regime, inclusion of the enhanced states suggests that the center of M-theory moduli space is a dynamical attractor. Morever, our results seem to suggest that string dynamics does indeed favor a vacuum near fixed points of duality. * Electronic address: sera@het.brown.edu † Electronic address: watsongs@physics.utoronto.ca

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Section: Classical Approach To Trappingmentioning

confidence: 99%

Dilaton dynamics from production of tensionless membranes

Cremonini

Watson

2006

Phys. Rev. D

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“…We regard the z-directions as the extra dimensions and compactify them. Because g pq depends on u, the size of the compactified extra dimensions changes with u or with x 0 and x 10 . We show that we can construct a solution describing the compactificationdecompactification transition utilising this feature.…”

Section: B)mentioning

confidence: 99%

Time-Dependent Supersymmetric Solutions in M-Theory and the Compactification-Decompactification Transition

Kodama

Ohta

2006

Progress of Theoretical Physics

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We show that the diagonal light-like solution with 16 supersymmetries in elevendimensional supergravity derived in our previous paper can be generalised to nondiagonal solutions preserving the same number of supersymmetries. Although the metric coefficients of this generalised light-like solution depend on only a single null coordinate, this class of solutions contains a subclass equivalent to the class of solutions found by Bin Chen that are dependent on the spatial coordinates. Utilising these solutions, we construct toroidally compactified solutions that smoothly connect a static compactified region with a dynamically decompactifying region along a null hypersurface. * )

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“…The case of flop transitions, whereby one S 2 is shrunk and replaced by a topologically distinct S 2 , was studied in [7,8]. This was followed by a study of the more drastic topology changing transition of the conifold [9][10][11][12], where an S 2 is replaced by, or replaces, an S 3 . An important aspect of the transitions which emerged from these studies is the issue of moduli trapping.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we aim to address the issues of moduli trapping and string formation from a full three dimensional point of view, allowing spatial variations of the fields. The cosmological models [7][8][9][10][11][12] were, for simplicity, treated as effectively one dimensional with the fields taken as spatially homogeneous. This has the effect that no currents are formed, which in turn means that gauge fields will not be excited, so any dynamics involving these currents and gauge fields has not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…In section 2 we will introduce the fields and the action we will be working with. We will then discuss the issue of moduli trapping in more detail summarising the findings in [7][8][9][10][11][12] and introduce the alternative idea of quantum moduli trapping [21]. In section 3 we will introduce the details of the simulations that were performed and discuss the results.…”

Section: Introductionmentioning

confidence: 99%

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The effects of inhomogeneities on the cosmology of type IIB conifold transitions

Palti

Saffin

Urrestilla

2006

J. High Energy Phys.

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In this paper we examine the evolution of the effective field theory describing a conifold transition in type IIB string theory. Previous studies have considered such dynamics starting from the cosmological approximation of homogeneous fields , here we include the effects of inhomogeneities by using a real-time lattice field theory simulation. By including spatial variations we are able to simulate the effect of currents and the gauge fields which they source. We identify two different regimes where the inhomogeneities have opposite effects, one where they aid the system to complete the conifold transition and another where they hinder it. The existence of quantized fluxes in related systems has lead to the speculation that (unstable) string solutions could exist, using our simulations we give strong evidence that these string-like defects do not form. § 1 There might be a possibility of having confinement for semilocal-like string solutions for finite strings [19].

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Conifold cosmologies in IIA string theory

Abstract: Abstract:We discuss the extension of our recent work on M-theory conifold cosmologies to general conifold transitions and type-IIA string theory.

Cited by 12 publications

References 18 publications

Dilaton dynamics from production of tensionless membranes

Dilaton dynamics from production of tensionless membranes

Time-Dependent Supersymmetric Solutions in M-Theory and the Compactification-Decompactification Transition

The effects of inhomogeneities on the cosmology of type IIB conifold transitions

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