Singularities in and Stability of Ooguri-Vafa-Verlinde Cosmologies
arXiv:hep-th/0504106
Abstract
Ooguri, Vafa, and Verlinde have recently proposed an approach to string cosmology which is based on the idea that cosmological string moduli should be selected by a Hartle-Hawking wave function. They are led to consider a certain Euclidean space which has *two different Lorentzian interpretations*, one of which is a model of an *accelerating cosmology*. We describe in detail how to implement this idea without resorting to a "complex metric". We show that the four-dimensional version of the OVV cosmology is null geodesically incomplete but has no curvature singularity; also that it is [barely] stable against the Seiberg-Witten process [nucleation of brane pairs]. The introduction of matter satisfying the Null Energy Condition has the paradoxical effect of both stabilizing the spacetime and rendering it genuinely singular. We show however that it is possible to arrange for an effective violation of the NEC in such a way that the singularity is avoided and yet the spacetime remains stable. The possible implications for the early history of these cosmologies are discussed.
arXiv commentImproved affiliation, clarifications in response to reader feedback [thanks], more references added, 37 pages, but that includes 6 eps pictures
References in corpus (84)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- Large N Field Theories, String Theory and Gravity
- Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
- de Sitter Vacua in String Theory
- Dark Energy Constraints from the Cosmic Age and Supernova
- Can the dark energy equation-of-state parameter w be less than -1?
- The dS/CFT Correspondence
- Properties of singularities in (phantom) dark energy universe
- Late-time cosmology in (phantom) scalar-tensor theory: dark energy and the cosmic speed-up
- Gauss-Bonnet dark energy
- Braneworld models of dark energy
- Locally Localized Gravity
- Can dark energy evolve to the Phantom?
- The D1/D5 System And Singular CFT
- The final state and thermodynamics of dark energy universe
- Is there Supernova Evidence for Dark Energy Metamorphosis ?
- String theory and gravity
- Quantum effects can render w<-1 on cosmological scales
- Wormholes in AdS
- Dark Energy: Vacuum Fluctuations, the Effective Phantom Phase, and Holography
- WMAP constraints on low redshift evolution of dark energy
- Quantum escape of sudden future singularity
- Crossing the Phantom Divide: Dark Energy Internal Degrees of Freedom
- The dS/CFT Correspondence and the Big Smash
- Cosmological parameters from supernova observations: A critical comparison of three data sets
- Cosmology and the S-matrix
- Weyl Cohomology and the Effective Action for Conformal Anomalies
- Constraints on linear-negative potentials in quintessence and phantom models from recent supernova data
- Brane Gases in the Early Universe
- Constraining the Topology of the Universe
- Dynamical dark energy: Current constraints and forecasts
- On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations
- Dark-Energy Evolution Across the Cosmological-Constant Boundary
- Dark energy cosmology with generalized linear equation of state
- Exploring Cosmological Expansion Parametrizations with the Gold SnIa Dataset
- Phantom Inflation and Primordial Perturbation Spectrum
- Hartle-Hawking Wave-Function for Flux Compactifications
- The Phantom Divide in String Gas Cosmology
- Nearly Scale-Invariant Spectrum of Adiabatic Fluctuations May be from a Very Slowly Expanding Phase of the Universe
- Baby Universes in String Theory
- Avoidance of Big Rip In Phantom Cosmology by Gravitational Back Reaction
- Nut Charged Space-times and Closed Timelike Curves on the Boundary
- Statistics of M theory Vacua
- Tall tales from de Sitter space I: Renormalization group flows
- Closed Universes, de Sitter Space and Inflation
- Instabilities and the null energy condition
- Bouncing Brane Cosmologies from Warped String Compactifications
- Inflation without a beginning: a null boundary proposal
- Interaction Rates in String Gas Cosmology
- Effective State Metamorphosis in Semi-Classical Loop Quantum Cosmology
- Future Universe With w < -1 Without Big Smash
- Brane Gases on K3 and Calabi-Yau Manifolds
- Stability in Asymptotically AdS Spaces
- Dynamics of Brane-World Cosmological Models
- Accelerating Universes and String Theory
- Inflation and Brane Gases
- Effective Field Theory Approach to String Gas Cosmology
- Scalar field instability in de Sitter space-time
- De Sitter and Schwarzschild-De Sitter According to Schwarzschild and De Sitter
- Patch dualities and remarks on nonstandard cosmologies
- Cosmological Surprises from Braneworld models of Dark Energy
- Linear Perturbations in Brane Gas Cosmology
- Quantization of the massless minimally coupled scalar field and the dS/CFT correspondence
- Describing the platycosms
- Coupled Inflation and Brane Gases
- Gauge theories on hyperbolic spaces and dual wormhole instabilities
- Curved space resolution of singularity of fractional D3-branes on conifold
- Moduli (Dilaton, Volume and Shape) Stabilization via Massless F and D String Modes
- The nearly flat universe
- Late-time phantom universe in dark energy model with exponential potential
- Multi-graviton theory from a discretized RS brane-world and the induced cosmological constant
- Inflation, Large Branes, and the Shape of Space
- Orbifold Physics and de Sitter Spacetime
- The Covariant Entropy Bound, Brane Cosmology, and the Null Energy Condition
- Stringy Instability of Topologically Non-Trivial Ads Black Holes and of desitter S-Brane Spacetimes
- Asymptotic cosmological solutions for string/brane gases with solitonic fluxes
- Classifying the Future of Universes with Dark Energy
- On the structure of asymptotically de Sitter and anti-de Sitter spaces
- Conformal models of de Sitter space, initial conditions for inflation and the CMB
- Tachyons in de Sitter space and analytical continuation from dS/CFT to AdS/CFT
- Flux and Freund-Rubin Superpotentials in M-theory
- The Phantom of the OPRA
- Singular Instantons Made Regular
- Big Rip in SO(1,1) phantom universe