Dodecahedral space topology as an explanation for weak wide-angle temperature correlations in the cosmic microwave background

Luminet, Jean‐Pierre; Weeks, Jeffrey R.; Riazuelo, Alain; Lehoucq, Roland; Uzan, Jean‐Philippe

doi:10.1038/nature01944

Cited by 362 publications

(511 citation statements)

References 11 publications

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“…[6,7,8,9] and references therein), there has also been constant activity to understand possible underlying physical reasons for the outliers (see, for an inexhaustive list, Refs. [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32]). …”

Section: Introductionmentioning

confidence: 99%

Punctuated inflation and the low CMB multipoles

Jain

Chingangbam

Gong

et al. 2009

J. Cosmol. Astropart. Phys.

152

172

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Abstract. We investigate inflationary scenarios driven by a class of potentials which are similar in form to those that arise in certain minimal supersymmetric extensions of the standard model. We find that these potentials allow a brief period of departure from inflation sandwiched between two stages of slow roll inflation. We show that such a background behavior leads to a step like feature in the scalar power spectrum. We set the scales such that the drop in the power spectrum occurs at a length scale that corresponds to the Hubble radius today-a feature that seems necessary to explain the lower power observed in the quadrupole moment of the Cosmic Microwave Background (CMB) anisotropies. We perform a Markov Chain Monte Carlo analysis to determine the values of the model parameters that provide the best fit to the recent WMAP 5-year data for the CMB angular power spectrum. We find that an inflationary spectrum with a suppression of power at large scales that we obtain leads to a much better fit (with just one extra parameter, χ 2 eff improves by 6.62) of the observed data when compared to the best fit reference ΛCDM model with a featureless, power law, primordial spectrum.

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Section: Introductionmentioning

confidence: 99%

Punctuated inflation and the low CMB multipoles

Jain

Chingangbam

Gong

et al. 2009

J. Cosmol. Astropart. Phys.

152

172

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show abstract

“…A special model -the Poincaré dodecahedral space of positive spatial curvature with the density parameter Ω ≃ 1.013 > 1 -is demonstrated to reproduce the observed shape of the spectrum better than do models of an infinite space (Luminet et al 2003;Luminet 2005, Aurich et al 2004). The figure for the density parameter is compatible with the WMAP limitations Ω = 1.02 ± 0.02 (see Eq.7).…”

Section: The Concordance Figuresmentioning

confidence: 99%

“…One of the most drastic implications from the WMAP data is the evidence for a finite Universe (Luminet et al 2003). The insight into the global structure of the Universe is provided by the power spectrum of the cosmic microwave background anisotropy at the lowest harmonics, or the largest spatial scales.…”

Section: The Concordance Figuresmentioning

confidence: 99%

“…The lack of power on the largest scales indicates most probably that the space is not big enough to support them. According to Luminet et al (2003), the current size of the 3D co-moving volume…”

Section: The Concordance Figuresmentioning

confidence: 99%

“…I describe also a new impressive idea of a finite Universe derived by Luminet et al (2003) from the WMAP data. Then I show that a simple regularity can be recognized behind the list of the cosmic energy ingredients.…”

Section: Introductionmentioning

confidence: 99%

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Energy Composition of the Universe: Time-Independent Internal Symmetry

Chernin

2006

Astrophys Space Sci

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The energy composition of the Universe, as emerged from the Type Ia supernova observations and the WMAP data, looks preposterously complex, -but only at the first glance. In fact, its structure proves to be simple and regular. An analysis in terms of the Friedmann integral enables to recognize a remarkably simple time-independent covariant robust recipe of the cosmic mix: the numerical values of the Friedmann integral for vacuum, dark matter, baryons and radiation are approximately identical. The identity may be treated as a symmetry relation that unifies cosmic energies into a regular set, a quartet, with the Friedmann integral as its common genuine time-independent physical parameter. Such cosmic internal (non-geometrical) symmetry exists whenever cosmic energies themselves exist in nature. It is most natural for a finite Universe suggested by the WMAP data. A link to fundamental theory may be found under the assumption about a special significance of the electroweak energy scale in both particle physics and cosmology. A freeze-out model developed on this basis demonstrates that the physical nature of new symmetry might be due to the interplay between electroweak physics and gravity at the cosmic age of a few 1 picoseconds. The big 'hierarchy number' of particle physics represents the interplay in the model. This number quantifies the Friedmann integral and gives also a measure to some other basic cosmological figures and phenomena associated with new symmetry. In this way, cosmic internal symmetry provides a common ground for better understanding of old and recent problems that otherwise seem unrelated; the coincidence of the observed cosmic densities, the flatness of the co-moving space, the initial perturbations and their amplitude, the cosmic entropy are among them.

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