Pyrotechnic Universe

@inproceedings{Kallosh2001PyrotechnicU,
  title={Pyrotechnic Universe},
  author={R. Kallosh and L. Kofman and Andrei Linde},
  year={2001}
}
One of the central points of the ekpyrotic cosmological scenario based on Hor̆ava-Witten theory is that we live on a negative tension brane. However, the tension of the visible brane in HW theory, as well as in relevant cases of non-standard embedding, is positive. To make this scenario realistic one must solve the problem of the negative cosmological constant on the visible brane and fine-tune the bulk brane potential with an accuracy of 10−50. In terms of a canonically normalized scalar field… Expand

Figures from this paper

Hubble law and brane matter after ekpyrosis
Abstract We study brane matter in the ekpyrotic scenario and observe that in order to obtain standard gravity on the visible brane, the tension of the visible brane should be positive. If the sizesExpand
On ekpyrotic brane collisions
We derive the five-dimensional metrics which describe a non-singular boundary brane collision in the ekpyrotic scenario in the context of general relativity, taking into account brane tension. WeExpand
Brane world cosmology
Recent developments in the physics of extra dimensions have opened up new avenues to test such theories. We review cosmological aspects of brane world scenarios such as the Randall–Sundrum braneExpand
On adiabatic perturbations in the ekpyrotic scenario
In a recent paper arXiv:0910.2230, Khoury and Steinhardt proposed a way to generate adiabatic cosmological perturbations with a nearly flat spectrum in a contracting Universe. To produce theseExpand
On the Spectrum of Fluctuations in an Effective Field Theory of the Ekpyrotic Universe
We consider the four-dimensional effective field theory which has been used in previous studies of perturbations in the Ekpyrotic Universe, and discuss the spectrum of cosmological fluctuationsExpand
Graviton oscillations in the two-brane world
Abstract We study the braneworld effective action in the two-brane Randall–Sundrum model. In the framework of this essentially-non-local action we reveal the origin of an infinite sequence ofExpand
Baryogenesis by brane collision
We present a new scenario for baryogenesis in the context of heterotic brane-world models. The baryon asymmetry of the universe is generated at a small-instanton phase transition which is initiatedExpand
Moving five-branes in low-energy heterotic M theory
We construct cosmological solutions of four-dimensional effective heterotic M-theory with a moving five-brane and evolving dilaton and T modulus. It is shown that the five-brane generates aExpand
The New Ekpyrotic Ghost
The new ekpyrotic scenario attempts to solve the singularity problem by involving violation of the null energy condition in a model which combines the ekpyrotic/cyclic scenario with the ghostExpand
Cosmology and brane worlds: a review
Cosmological consequences of the brane world scenario are reviewed in a pedagogical manner. According to the brane world idea, the standard model particles are confined on a hypersurface (a so-calledExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 39 REFERENCES
The Ekpyrotic universe: Colliding branes and the origin of the hot big bang
We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane, beginning from an otherwise cold,Expand
Brane Inflation
We present a novel inflationary scenario in theories with low scale (TeV) quantum gravity, in which the standard model particles are localized on the branes whereas gravity propagates in the bulk ofExpand
Brane world sum rules
A set of consistency conditions is derived from Einstein equations for brane world scenarios with a spatially periodic internal space. In particular, the sum of the total tension of the flat branesExpand
Tilting the brane, or some cosmological consequences of the brane Universe
Abstract We discuss theories in which the standard-model particles are localized on a brane embedded in space–time with large compact extra dimensions, whereas gravity propagates in the bulk. InExpand
Five-brane superpotentials in heterotic M theory
Abstract The open supermembrane contribution to the non-perturbative superpotential of bulk space five-branes in heterotic M-theory is presented. We explicitly compute the superpotential for theExpand
Eleven-dimensional supergravity on a manifold with boundary
Abstract In this paper, we present a systematic analysis of eleven-dimensional supergravity on a manifold with boundary, which is believed to be relevant to the strong coupling limit of the E 8 × E 8Expand
Supersymmetry breakdown at a hidden wall
Abstract We consider hidden sector supersymmetry breakdown in the strongly coupled heterotic E 8 × E 8 theory of Hořava and Witten. Using effective field theory methods in four dimensions, we canExpand
Small instanton transitions in heterotic M-theory
We discuss non-perturbative phase transitions, within the context of heterotic M-theory, which occur when all, or part, of the wrapped five-branes in the five-dimensional bulk space come into directExpand
Excision of singularities by stringy domain walls
We study supersymmetric domain walls on S1/Z2 orbifolds. The supergravity solutions in the bulk are given by the attractor equation associated with Calabi–Yau (CY) spaces and have a naked space–timeExpand
Singularities in inflationary cosmology: A Review
We review here some recent results that show that inflationary cosmological models must contain initial singularities. We also present a new singularity theorem. The question of the initialExpand
...
1
2
3
4
...