scholarly journals Correlated Adiabatic and Isocurvature Cosmic Microwave Background Fluctuations in the Wake of the Results from the Wilkinson Microwave Anisotropy Probe

2003 ◽  
Vol 91 (13) ◽  
Author(s):  
Jussi Väliviita ◽  
Vesa Muhonen
Keyword(s):  
Cosmic Microwave Background ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Microwave Background

scholarly journals Cosmic microwave background: probing the universe from z = 6 to 1100

2006 ◽  
Vol 2 (14) ◽  
pp. 254-254
Author(s):  
David N. Spergel
Keyword(s):  
Cosmic Microwave Background ◽  
Initial Conditions ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Line Of Sight ◽  
Microwave Background ◽  
Physical Conditions ◽  
Cosmic Microwave Background Temperature ◽  
Background Temperature ◽  
The Universe

Observations of cosmic microwave background temperature and polarization fluctuations are sensitive to both physical conditions at recombination (z = 1100) and physical process along the line of sight. I will discuss recent results from the Wilkinson Microwave Anisotropy Probe and planned ground and space-based observations. The talk will emphasize the role of CMB observations in determining the initial conditions for the growth of structure and as a probe of the physics of re-ionization.

scholarly journals A low cosmic microwave background variance in the Wilkinson Microwave Anisotropy Probe data

2008 ◽  
Vol 387 (1) ◽  
pp. 209-219 ◽  
Author(s):  
C. Monteserín ◽  
R. B. Barreiro ◽  
P. Vielva ◽  
E. Martínez-González ◽  
M. P. Hobson ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Microwave Background

ELLIPTIC CMB SKY

2005 ◽  
Vol 20 (11) ◽  
pp. 813-820 ◽  
Author(s):  
V. G. GURZADYAN ◽  
P. DE BERNARDIS ◽  
G. DE TROIA ◽  
C. L. BIANCO ◽  
A. L. KASHIN ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Temperature Threshold ◽  
Microwave Background ◽  
The Universe ◽  
Nontrivial Topology ◽  
Observed Behavior

The ellipticity of the anisotropy spots of the Cosmic Microwave Background measured by the Wilkinson Microwave Anisotropy Probe (WMAP) has been studied. We find an average ellipticity of about 2, confirming with a far larger statistics similar results found first for the COBE-DMR CMB maps, and then for the BOOMERanG CMB maps. There are no preferred directions for the obliquity of the anisotropy spots. The average ellipticity is independent of temperature threshold and is present on scales both smaller and larger than the horizon at the last scattering. The measured ellipticity characteristics are consistent with being the effect of geodesics mixing occurring in a hyperbolic Universe, and can mark the emergence of CMB ellipticity as a new observable constant describing the Universe. There is no way of simulating this effect. Therefore we cannot exclude that the observed behavior of the measured ellipticity can result from a trivial topology in the popular flat Λ-CDM model, or from a nontrivial topology.

scholarly journals Structures in the microwave background radiation

2013 ◽  
Vol 469 (2155) ◽  
pp. 20130116 ◽  
Author(s):  
Krzysztof A. Meissner ◽  
Paweł Nurowski ◽  
Błażej Ruszczycki
Keyword(s):  
Cosmic Microwave Background ◽  
Confidence Level ◽  
Background Radiation ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Microwave Background ◽  
Ring Type ◽  
Harmonic Content ◽  
Microwave Background Radiation

We compare the actual Wilkinson microwave anisotropy probe maps with artificial, purely statistical maps of the same harmonic content to argue that there are, with confidence level 99.7 per cent, ring-type structures in the observed cosmic microwave background.

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