IIT Kanpur IUCAA

1
CMB Angular power spectrum from WMAP
Independent, self contained analysis of WMAP
multi-frequency maps Blind estimation requires
no extraneous foreground modeling information !
I.e., free of uncertainty of foreground
modeling!!
IIT Kanpur IUCAA
Saha, Jain, Souradeep (Apj Lett 2006) Eriksen et
al. ApJ. 2006
2
Primordial power spectrum from WMAP
(Shafieloo Souradeep, 2004 PRD )
Primordial power spectrum from the Early universe
can be deconvolved from the measured CMB
anisotropy spectrum
(Power spectrum)
Horizon scale
(wave number)
Recovered spectrum shows an infra-red cut-off on
Horizon scale !!! Is it cosmic topology ?
Signature of pre-inflationary phase ? QG physics
? .
3
Statistical Isotropy of CMB Anisotropy
WMAP CMB anisotropy map
WMAP Angular power spectrum

• Detect measure underlying correlation
  patterns.
• Bipolar spectroscopy of cosmic topology.
• Diagnostics for foreground cleaned CMB maps.
• Identifying B-mode polarization signal of
  Gravity waves from inflation distinct from
  galactic contamination.

Fig NASA/WMAP science team
W(l)
Fig NASA/WMAP science team