Taming the Runaway Problem of Inflationary Landscapes

@article{Hall2006TamingTR,
  title={Taming the Runaway Problem of Inflationary Landscapes},
  author={Lawrence J. Hall and Taizan Watari and Tsutomu. T. Yanagida},
  journal={Physical Review D},
  year={2006},
  volume={73},
  pages={103502}
}
A wide variety of vacua, and their cosmological realization, may provide an explanation for the apparently anthropic choices of some parameters of particle physics and cosmology. If the probability on various parameters is weighted by volume, a flat potential for slow-roll inflation is also naturally understood, since the flatter the potential the larger the volume of the sub-universe. However, such inflationary landscapes have a serious problem, predicting an environment that makes it… 
Volume weighting the measure of the universe from classical slow-roll expansion
One of the most frustrating issues in early universe cosmology centers on how to reconcile the vast choice of universes in string theory and in its most plausible high energy sibling, eternal
Sinks in the landscape, Boltzmann brains and the cosmological constant problem
This paper extends a recent investigation of the string theory landscape (Ceresole et al 2006 Phys. Rev. D 74 086010), where it was found that the decay rate of de Sitter (dS) vacua to a collapsing
Accidental inflation in string theory
We show that inflation in type IIB string theory driven by the volume modulus can be realized in the context of the racetrack-based Kallosh–Linde model (KL) of moduli stabilization. Inflation here
Inflating in a Better Racetrack
We present a new version of our racetrack inflation scenario which, unlike our original proposal, is based on an explicit compactification of type IIB string theory: the Calabi-Yau manifold
Scale of gravity and the cosmological constant within a landscape
It is possible that the scale of gravity, parametrized by the apparent Planck mass, may obtain different values within different universes in an encompassing multiverse. We investigate the range over
Predicting the cosmological constant with the scale-factor cutoff measure
It is well known that anthropic selection from a landscape with a flat prior distribution of cosmological constant {lambda} gives a reasonable fit to observation. However, a realistic model of the
Sinks in the Landscape and the Invasion of Boltzmann Brains
TLDR
This paper describes relations between several different probability measures for eternal inflation taking into account the existence of the sinks, and describes a simplified approach to the calculations of anthropic probabilities in the landscape, which is less powerful but also less ambiguous than other methods.
Boltzmann brains and the scale-factor cutoff measure of the multiverse
To make predictions for an eternally inflating 'multiverse', one must adopt a procedure for regulating its divergent spacetime volume. Recently, a new test of such spacetime measures has emerged:
The distribution of Omega_k from the scale-factor cutoff measure
Our universe may be contained in one among a diverging number of bubbles that nucleate within an eternally inflating multiverse. A promising measure to regulate the diverging spacetime volume of such
What can the observation of nonzero curvature tell us
The eternally inflating multiverse provides a consistent framework to understand coincidences and fine-tuning in the universe. As such, it provides the possibility of finding another coincidence: if
...
1
2
3
...

References

SHOWING 1-10 OF 90 REFERENCES
Density perturbations and the cosmological constant from inflationary landscapes
An anthropic understanding of the cosmological constant requires that the vacuum energy at late time scans from one patch of the universe to another. If the vacuum energy during inflation also scans,
Predictability crisis in inflationary cosmology and its resolution
Models of inflationary cosmology can lead to variation of observable parameters ("constants of Nature") on extremely large scales. The question of making probabilistic predictions for today's
Stationarity of inflation and predictions of quantum cosmology.
TLDR
A new mechanism is proposed which may help solve the cosmological constant problem and is given examples of models where each of these possibilities can be realized, and some implications for quantum cosmology are discussed.
What does inflation really predict
If the inflaton potential has multiple minima, as may be expected in, e.g., the string theory 'landscape', inflation predicts a probability distribution for the cosmological parameters describing
Predictive Landscapes and New Physics at a TeV
We propose that the Standard Model is coupled to a sector with an enormous landscape of vacua, where only the dimensionful parameters--the vacuum energy and Higgs masses--are finely ''scanned'' from
Probabilities in the inflationary multiverse
Inflationary cosmology leads to the picture of a 'multiverse', involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes. In the context of
Predictions from quantum cosmology.
  • Vilenkin
  • Physics
    Physical review letters
  • 1995
TLDR
The picture that has emerged from this line of development is that a small closed universe can spontaneously nucleate out of nothing, where by ‘nothing’ I mean a state with no classical space and time.
Anthropic Prediction for Λ and the Q Catastrophe
We discuss probability distributions for the cosmological constant A and the amplitude of primordial density fluctuations Q in models where they both are anthropic variables. With mild assumptions
Cosmological constant and the time of its dominance
We explore a model in which the cosmological constant L and the density contrast at the time of recombination s rec are random variables, whose range and a priori probabilities are determined by the
The Curvaton Web
We discuss nontrivial features of the large scale structure of the universe in the simplest curvaton model proposed in our paper astro-ph/9610219. The amplitude of metric perturbations in this model
...
1
2
3
4
5
...