Limitations of CMB <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math> -mode template delensing
نویسندگان
چکیده
Measurements of the primordial B modes CMB are crucial for testing cosmic inflation. However, gravitational lensing photons contaminates these measurements. Here, authors show, through analytic and numerical work, that simplest method removing this contamination, using a template at gradient level based on lensed E modes, is perhaps unexpectedly, remarkably effective will be very useful in analyzing data, especially detecting low values tensor to scalar ratio.
منابع مشابه
Delensing CMB Polarization with External Datasets
One of the primary scientific targets of current and future CMB polarization experiments is the search for a stochastic background of gravity waves in the early universe. As instrumental sensitivity improves, the limiting factor will eventually be B-mode power generated by gravitational lensing, which can be removed through use of so-called “delensing” algorithms. We forecast prospects for dele...
متن کاملBirefringence, CMB polarization and magnetized B-mode
Even in the absence of a sizable tensor contribution, a B-mode polarization can be generated because of the competition between a pseudo-scalar background and pre-decoupling magnetic fields. By investigating the dispersion relations of a magnetoactive plasma supplemented by a pseudo-scalar interaction, the total B-mode polarization is shown to depend not only upon the plasma and Larmor frequenc...
متن کاملTowards a free-free template for CMB foregrounds
A full-sky template map of the Galactic free-free foreground emission component is increasingly important for high sensitivity CMB experiments. We use the recently published Hα data of both the northern and southern skies as the basis for such a template. The first step is to correct the Hα maps for dust absorption using the 100 μm dust maps of Schlegel, Finkbeiner & Davis (1998). We show that ...
متن کاملImpact of modulation on CMB B-mode polarization experiments
We investigate the impact of both slow and fast polarization modulation strategies on the science return of upcoming ground-based experiments aimed at measuring the B-mode polarization of the cosmic microwave background. Using a full Monte-Carlo analysis of detailed simulations of the ClOVER experiment, we compare the ability of modulated and un-modulated observations to recover the signature o...
متن کاملOptimizing interferometer experiments for CMB B mode measurement
The sensitivity of interferometers with linear polarizers to the CMB E and B mode are variant under the rotation of the polarizer frame, while interferometer with circular polarizers are equally sensitive to E and B mode. We present analytically and numerically that the diagonal elements of window functions for CMB E/B power spectra are maximized in interferometric measurement of linear polariz...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.103.023518