COSMOLOGICAL PERTURBATIONS: MYTHS AND FACTS

@article{Steinhardt2004COSMOLOGICALPM,
  title={COSMOLOGICAL PERTURBATIONS: MYTHS AND FACTS},
  author={Paul J. Steinhardt},
  journal={Modern Physics Letters A},
  year={2004},
  volume={19},
  pages={967-982}
}
  • P. Steinhardt
  • Published 30 May 2004
  • Physics
  • Modern Physics Letters A
We discuss (and debunk) ten common myths about cosmological perturbations in inflationary and ekpyrotic/cyclic models and their implications for future observations. 

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References

SHOWING 1-10 OF 16 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,

Density perturbations in the ekpyrotic scenario

We study the generation of density perturbations in the ekpyrotic scenario for the early universe, including gravitational backreaction. We expose interesting subtleties that apply to both

A Probe of Primordial Gravity Waves and Vorticity

A formalism for describing an all-sky map of the polarization of the cosmic microwave background is presented. The polarization pattern on the sky can be decomposed into two geometrically distinct

Signature of gravity waves in polarization of the microwave background

Using spin-weighted decomposition of polarization in the cosmic microwave background (CMB) we show that a particular combination of Stokes $Q$ and $U$ parameters vanishes for primordial fluctuations

First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters

WMAP precision data enable accurate testing of cosmological models. We find that the emerging standard model of cosmology, a flat Λ-dominated universe seeded by a nearly scale-invariant adiabatic

Phys

  • Rev. Lett. 69, 1856 (1992); A. Liddle and D. Lyth, Phys. Lett. B 291, 391
  • 1992

Phys

  • Rev. D 28, 679 (1983); A.H. Guth and S.-Y. Pi, Phys. Rev. Lett. 49, 1110 (1982); A.A. Starobinskii, Phys. Lett. B 117, 175 (1982); S.W. Hawking, Phys. Lett. B 115, 295
  • 1982

Phys

  • Rev. D 64, 123522
  • 2001

Phys

  • Rev. D 23, 347 (1981); A.D. Linde, Phys. Lett. B 108, 389 (1982); A. Albrecht and P.J. Steinhardt, Phys. Rev. Lett. 48, 1220
  • 1982