# Holography and the scale invariance of density fluctuations

@article{Magueijo2006HolographyAT, title={Holography and the scale invariance of density fluctuations}, author={Jo{\~a}o Magueijo and Lee Smolin and Carlo R. Contaldi}, journal={Classical and Quantum Gravity}, year={2006}, volume={24}, pages={3691 - 3699} }

We study a scenario for the very early universe in which there is a fast phase transition from a non-geometric, high temperature phase to a low temperature, geometric phase described by a classical solution to the Einstein equations. In spite of the absence of a classical metric, the thermodynamics of the high temperature phase may be described by making use of the holographic principle. The thermal spectrum of fluctuations in the high temperature phase manifests itself after the phase…

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## References

SHOWING 1-10 OF 43 REFERENCES

### SUPERLUMINARY UNIVERSE: A POSSIBLE SOLUTION TO THE INITIAL VALUE PROBLEM IN COSMOLOGY

- Physics
- 1993

The spontaneous breaking of local Lorentz invariance in the early Universe, associated with a first order phase transition at a critical time tc, generates a large increase in the speed of light and…

### Could thermal fluctuations seed cosmic structure

- Physics
- 2003

We examine the possibility that thermal, rather than quantum, fluctuations are responsible for seeding the structure of our universe. We find that while the thermalization condition leads to nearly…

### Producing a scale-invariant spectrum of perturbations in a Hagedorn phase of string cosmology.

- PhysicsPhysical review letters
- 2006

In this cosmological scenario, the early Hagedorn phase of string gas cosmology goes over smoothly into the radiation-dominated phase of standard cosmology, without having a period ofcosmological inflation.

### The world as a hologram

- Physics
- 1994

According to ’t Hooft the combination of quantum mechanics and gravity requires the three‐dimensional world to be an image of data that can be stored on a two‐dimensional projection much like a…

### A Time varying speed of light as a solution to cosmological puzzles

- Physics
- 1999

We consider the cosmological implications of light travelling faster in the early Universe. We propose a prescription for deriving corrections to the cosmological evolution equations while the speed…

### Origin of the large scale structures of the universe

- Physics
- 2004

We revise the statistical properties of the primordial cosmological density anisotropies that, at the time of matter-radiation equality, seeded the gravitational development of large scale structures…

### More on the spectrum of perturbations in string gas cosmology

- Physics
- 2006

String gas cosmology is rewritten in the Einstein frame. In an effective theory in which a gas of closed strings is coupled to a dilaton gravity background without any potential for the dilaton, the…

### New varying speed of light theories

- Physics
- 2003

We review recent work on the possibility of a varying speed of light (VSL). We start by discussing the physical meaning of a varying-c, dispelling the myth that the constancy of c is a matter of…

### Black hole evaporation without information loss

- Physics
- 1994

An approach to black hole quantization is proposed wherein it is assumed that quantum coherence is preserved. After giving our motivations for such a quantization procedure we formulate the…