Hints of Isocurvature Perturbations in the Cosmic Microwave Background - INSPIRE

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Hints of Isocurvature Perturbations in the Cosmic Microwave Background

Reijo Keskitalo
(
- Helsinki Inst. of Phys. and
- Helsinki U.
)
,
Hannu Kurki-Suonio
(
- Helsinki U.
)
,
Vesa Muhonen
(
- Helsinki Inst. of Phys. and
- Helsinki U.
)
,
Jussi Valiviita
(
- Portsmouth U., ICG
)

Nov, 2006

4 pages

Published in:

JCAP 09 (2007) 008

e-Print:

astro-ph/0611917 [astro-ph]

DOI:

10.1088/1475-7516/2007/09/008

Report number:

HIP-2006-52-TH,
ICG-06-43

View in:

ADS Abstract Service

reference search70 citations

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Abstract: (arXiv)

The improved data on the cosmic microwave background (CMB) anisotropy allow a better determination of the adiabaticity of the primordial perturbation. Interestingly, we find that recent CMB data seem to favor a contribution of a primordial isocurvature mode where the entropy perturbation is positively correlated with the primordial curvature perturbation and has a large spectral index (niso ~ 3). With 4 additional parameters we obtain a better fit to the CMB data by Delta chi^2 = 9.7 compared to an adiabatic model. For this best-fit model the nonadiabatic contribution to the CMB temperature variance is 4%. According to a Markov Chain Monte Carlo analysis the nonadiabatic contribution is positive at more than 95% C.L. The exact C.L. depends somewhat on the choice of priors, and we discuss the effect of different priors as well as additional cosmological data.

References(35)

Figures(0)

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)
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)
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Kari Enqvist
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Hannu Kurki-Suonio
(
- Helsinki U.
)
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(
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)
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)

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Patrick Crotty
(
- Annecy, LAPTH
)
,
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(
- Madrid, Autonoma U.
)
,
Julien Lesgourgues
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David Parkinson
(
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)
,
Shinji Tsujikawa
(
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)
,
Bruce A. Bassett
(
- Kyoto U. and
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Luca Amendola
(
- Rome Observ.
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K. Moodley
(
- KwaZulu Natal U. and
- Oxford U.
)
,
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(
- Cambridge U., DAMTP
)
,
Joanna Dunkley
(
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)
,
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(
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)
,
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)

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Francesc Ferrer
(
- Oxford U.
)
,
Syksy Rasanen
(
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)
,
Jussi Valiviita
(
- Helsinki U. and
- Helsinki Inst. of Phys.
)

- JCAP 10 (2004) 010
•
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- astro-ph/0407300
•
DOI:
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Maria Beltran
(
- Madrid, Autonoma U.
)
,
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(
- Madrid, Autonoma U.
)
,
Julien Lesgourgues
(
- Annecy, LAPTH
)
,
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(
- Paris, Inst. Astrophys.
)

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•
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•
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C.J. MacTavish
(
- Toronto U.
)
,
P.A.R. Ade
(
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)
,
J.J. Bock
(
- Caltech, JPL
)
,
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- Canadian Inst. Theor. Astrophys.
)
,
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(
- LBL, Berkeley
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et al.

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(
- Princeton U., Astrophys. Sci. Dept. and
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)

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Rachel Bean
(
- Cornell U., Astron. Dept.
)
,
Joanna Dunkley
(
- Princeton U.
)
,
Elena Pierpaoli
(
- UCLA
)

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•
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Antony Lewis
(
- Cambridge U., Inst. of Astron.
)

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Roberto Trotta
(
- Oxford U.
)

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•
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•
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•
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SDSS

Collaboration

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Max Tegmark
(
- MIT
)

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Christopher Gordon
(
- Portsmouth U.
)
,
David Wands
(
- Portsmouth U.
)
,
Bruce A. Bassett
(
- Portsmouth U.
)
,
Roy Maartens
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- Portsmouth U.
)

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•
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Luca Amendola
(
- Rome Observ.
)
,
Christopher Gordon
(
- Portsmouth U., ICG
)
,
David Wands
(
- Portsmouth U., ICG
)
,
Misao Sasaki
(
- Osaka U., Dept. Earth Space Sci.
)

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•
e-Print:
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•
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•
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•
DOI:
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- Phys.Rev.D 66 (2002) 103511
•
e-Print:
- astro-ph/0205436
•
DOI:
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