Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.arcetri.astro.it/cpr/PdfPresentations/Ferte.pdf Дата изменения: Thu Sep 10 10:26:46 2015 Дата индексирования: Sun Apr 10 02:58:51 2016 Кодировка: Поисковые слова: южная атлантическая аномалия

CMB EB and TB correlations as a probe of the primordial universe
AgnХs FertИ (IfA, Edinburgh, UK), Julien Grain (IAS, Orsay, France) Realistic forecasts on the detection CMB EB and TB cor relations: ХA current ground based experime of rsignature of non standard physics constrain on r-. E.g.: for =1, r+=0.1, SNR = 0.2. In the primordial universe:
· · · In · · · Chiral gravity Helical magnetic field ... the late universe: Cosmic birefrengence Astrophysical magnetic field ... The case of two experiments : · Typical current ground-based (or balloon-borne) experiment = observed sky fraction of 1%, beam of 8 arcmin, noise of 5.75 uK-arcmin · Potential forthcoming satellite mission = observed sky fraction of 71%, beam of 8 arcmin, noise of 2.2 uKarcmin nt can't set

ХA satellite mission could constrain r- (and therefore ).

=1 r+ = 0.2 r+ = 0.1 5.46 3.67

= 0.5 2.5 1.51

The case of chiral gravity: Right-handed and left-handed gravitational waves evolve differently during inflation. It therefore induce CMB TB and EB correlations: R TB /E B T/E R L C` = dk `,T (k, 0 ) B (k, 0 )[PT (k ) PT (k )] `,T

C

BB `

We define the strength of symmetry breaking as:

= r+ T

= r- T

TB /E B `

We use the Fisher rmatrix to estimate the constraints on r-. The uncertainties on the CMB power spectra are derived using : · Mode-counting variance = analytic formula of the sampling variance. Underestimate uncertainties. · Pure estimation = estimation of pure B modes, correct for the partial sky coverage effects. Smith, 2006
Grain et al, 2009 FertИ et al, 2013

Signal to noise ratio on r- for a potential satellite mission

Caveat: if estimated jointly with miscalibration angle of the polarisation detector, the SNR on is degraded. The case of primordial magnetic field (new tensor source): The presence of a primordial helical magnetic field leads to non zero TB and EB correlations and contribute to the other CMB power spectra. Work in progress. Caprini et al, 200

BB `

+T

EE !BB `,lens

r = r

+

2 [ 1; 1]

4

Contaldi et al, 2008 FertИ et al, 2014

Uncer tainties on TB cor relations expected for a potential satellite mission

CMB Lensed EB and TB cor relations

ХThe use of mode counting approach overestimates forecasts on the detection of rE.g.: for =1, r+=0.05, 2 detection of chiral gravity for pure approach but 3 detection for mode counting.

CMB EB cor relations due to a primordial magnetic field

The Institute for Astronomy on the site of the Royal Obser vator y Edinburgh

© UK ATC, Royal Observatory, Edinburgh.