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Measure of the CMB polarization anisotropies. N. Ponthieu. Overview of current results and on going projects French participation Prospects. CMB polarization if one of the hotest topics in observationnal cosmology (See. S. Prunet’s talk)

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slide1

Measure of the CMB polarization anisotropies

N. Ponthieu

  • Overview of current results and on going projects
  • French participation
  • Prospects
slide2

CMB polarization if one of the hotest topics in observationnal cosmology (See. S. Prunet’s talk)

  • Many on going projects dedicated to its measurement
  • 1st detections in the past 3 years !…
  • … but still a lot to do too !
slide3

Status and prospect of experimental projects for primordial polarization anisotropies

Ground

Balloon

Satellite

  • French institutes implicated both in data analysis and instrumental developpements
  • Mainly Bolometer experiments…
  • Number of detectors increase, move towards matrices

2005

2006

2007

2008

2009

2010

2015-2020

WMAP

Maxipol

QUAD

BICEP

PolarBear

Brain

CMBpol Satellite

EBEX

QUIET

Spider

Planck

Clover

slide4

Status and prospect of experimental projects for primordial polarization anisotropies

Ground

Balloon

Satellite

  • French institutes implicated both in data analysis and instrumental developpements
  • Mainly Bolometer experiments…
  • Number of detectors increase, move towards matrices

2005

2006

2007

2008

2009

2010

2015-2020

WMAP

Maxipol

QUAD

BICEP

PolarBear

Brain

CMBpol Satellite

EBEX

QUIET

Spider

Planck

Clover

APC + LAL

All

IAS

APC + LAL

All

APC

IAS

slide5

Status and prospect of experimental projects for primordial polarization anisotropies

Ground

Balloon

Satellite

L4

L1

L3

L2

L5

  • French institutes implicated both in data analysis and instrumental developpements
  • Mainly Bolometer experiments…
  • Number of detectors increase, move towards matrices

2005

2006

2007

2008

2009

2010

2015-2020

WMAP

Maxipol

QUAD

BICEP

PolarBear

Brain

CMBpol Satellite

EBEX

QUIET

Spider

Planck

Clover

IAS

APC + LAL

All

APC + LAL

All

APC

IAS

slide8

Projected sensitivities BB

Clover

Brain

T/S = 0.7

T/S = 0.1

T/S = 0.01

T/S = 0.001

  • Forecast sensitivities are encouraging
  • Control of systematics remains an issue
  • Foregrounds.. ?
slide9

Foregrounds : e.g. Galactic Dust

  • Archeops results obtained @353GHz
  • ~ 20% of the sky
  • Extrapolation to 100GHz

Multi-frequency component separation helps removing dust, but Archeops results show that it is much stronger than previously anticipated

Ponthieu et al, 2005, AA, in press

slide10

B mode dedicated satellite around 2020 ?

  • Resolution is not a true issue
  • Sensitivity is critical: thousands of detectors which may lead to “large” focal planes at short wavelengths, new electronics, cryogenics…
  • Control of systematics is critical
  • Ultimately full sky observation
  • Atmosphere makes large angular scales difficult to deal with
  • Foregrounds, the ultimate limit ?
  • The 2 bumps signature of B…

Ongoing studies of a dedicated satellite lead by the US (EPIC, France Co-I) and of a mini-satellite lead by France (SAMPAN)

slide11

Conclusions

  • CMB Polarization is one of the hotest topics in observationnal cosmology
  • 1st detections have confirmed the standard cosmological paradigm and set an achievable target (E modes)
  • France is well involved in present and future projects
  • Planck HFI will give a milestone measure of the E modes (BTW, HFI calibration due next January @ IAS !)
  • B modes remain the Grail of this quest…
slide12

On thy noble Path thou shalt measure the Weak Lensing, confront treacherous Foregrounds, vanquish evil Systematics. But herten thy Heart for thy Earth thou mighteth neede to leave…