Recently the second phase of Background Imaging of Cosmic Extragalactic Polarization(BICEP2)claimed a detection of the tensor-to-scalar ratio(r)of primordial fluctuation at 5σconfidence level.If it is true,this large...Recently the second phase of Background Imaging of Cosmic Extragalactic Polarization(BICEP2)claimed a detection of the tensor-to-scalar ratio(r)of primordial fluctuation at 5σconfidence level.If it is true,this large and measurable amplitude(r0.2)of B-mode polarization indicates that it is possible to measure the shape of CMB B-mode polarization with future experiments.Given the current understanding of the experimental noise and foreground contamination,we forecast the precision of r and the tensor spectral index ntmeasurements from Planck,Spider and POLARBEAR with ntas a free parameter.We quantitatively determine the signal-to-noise of the measurement in r-ntparameter space for the three experiments.The forecasted signal-to-noise ratio of the B-mode polarization somewhat depends on nt,but strongly depends on the true value of r.展开更多
We review the theory of inflationary perturbations. Perturbations at both linear and nonlinear orders are reviewed. We also review a variety of inflation models, emphasizing their signatures on cosmic perturbations.
基金supported by a CITA National Fellowship, a Starting Grant of the Eu-ropean Research Council (ERC STG Grant No. 279617)the Stephen Hawking Advanced Fellowshipfunded by BIS National E-infrastructure capital grant ST/J005673/1 and STFC grants ST/H008586/1, ST/K00333X/1
文摘Recently the second phase of Background Imaging of Cosmic Extragalactic Polarization(BICEP2)claimed a detection of the tensor-to-scalar ratio(r)of primordial fluctuation at 5σconfidence level.If it is true,this large and measurable amplitude(r0.2)of B-mode polarization indicates that it is possible to measure the shape of CMB B-mode polarization with future experiments.Given the current understanding of the experimental noise and foreground contamination,we forecast the precision of r and the tensor spectral index ntmeasurements from Planck,Spider and POLARBEAR with ntas a free parameter.We quantitatively determine the signal-to-noise of the measurement in r-ntparameter space for the three experiments.The forecasted signal-to-noise ratio of the B-mode polarization somewhat depends on nt,but strongly depends on the true value of r.
基金Supported by Fundings from the Kavli Institute for the Physics and Mathematics of the Universe(Kavli IPMU)the Japan Society for the Promotion of Science(JSPS)
文摘We review the theory of inflationary perturbations. Perturbations at both linear and nonlinear orders are reviewed. We also review a variety of inflation models, emphasizing their signatures on cosmic perturbations.
