scholarly journals cosmospec: fast and detailed computation of the cosmological recombination radiation from hydrogen and helium

2016 ◽  
Vol 456 (4) ◽  
pp. 3494-3508 ◽  
Author(s):  
Jens Chluba ◽  
Yacine Ali-Haïmoud
Keyword(s):  
Recombination Radiation ◽  
Cosmological Recombination ◽  
Detailed Computation

scholarly journals Sensitivity forecasts for the cosmological recombination radiation in the presence of foregrounds

2020 ◽  
Vol 497 (4) ◽  
pp. 4535-4548
Author(s):  
Luke Hart ◽  
Aditya Rotti ◽  
Jens Chluba
Keyword(s):  
Degrees Of Freedom ◽  
Cold Dark Matter ◽  
Cosmological Parameters ◽  
Spectral Structure ◽  
Microwave Background ◽  
Sterile Neutrinos ◽  
Recombination Radiation ◽  
Cosmological Recombination ◽  
Higher Sensitivity ◽  
Recombination Dynamics

ABSTRACT The cosmological recombination radiation (CRR) is one of the inevitable Lambda cold dark matter spectral distortions of the cosmic microwave background (CMB). While it shows a rich spectral structure across dm-mm wavelengths, it is also one of the smallest signals to target. Here, we carry out a detailed forecast for the expected sensitivity levels required to not only detect but also extract cosmological information from the CRR in the presence of foregrounds. We use CosmoSpec to compute the CRR including all important radiative transfer effects and modifications to the recombination dynamics. We confirm that detections of the overall CRR signal are possible with spectrometer concepts like SuperPIXIE. However, for a real exploitation of the cosmological information, an ≃ 50 times more sensitive spectrometer is required. While extremely futuristic, this could provide independent constraints on the primordial helium abundance, Yp, and probe the presence of extra relativistic degrees of freedom during BBN and recombination. Significantly improving the constraints on other cosmological parameters requires even higher sensitivity (another factor of ≃5) when considering a combination of a CMB spectrometer with existing CMB data. To a large part, this is due to astrophysical foregrounds which interestingly do not degrade the constraints on Yp and Neff as much. A future CMB spectrometer could thus open a novel way of probing non-standard BBN scenarios, dark radiation and sterile neutrinos. In addition, inflation physics could be indirectly probed using the CRR in combination with existing and forthcoming CMB anisotropy data.

Lower Bounds to the Eigenvalues in One-Dimensional Problems by a Shift in the Weight Function

1970 ◽  
Vol 37 (2) ◽  
pp. 267-270 ◽  
Author(s):  
D. Pnueli
Keyword(s):  
Lower Bound ◽  
Weight Function ◽  
Lower Bounds ◽  
Variational Formulation ◽  
Ritz Method ◽  
The Other ◽  
One Dimensional ◽  
Systematic Shift ◽  
The One ◽  
Detailed Computation

A method is presented to obtain both upper and lower bound to eigenvalues when a variational formulation of the problem exists. The method consists of a systematic shift in the weight function. A detailed procedure is offered for one-dimensional problems, which makes improvement of the bounds possible, and which involves the same order of detailed computation as the Rayleigh-Ritz method. The main contribution of this method is that it yields the “other bound;” i.e., the one which cannot be obtained by the Rayleigh-Ritz method.

Recombination radiation in natural and compensated GaSb

1970 ◽  
Vol 2 (4) ◽  
pp. 779-784 ◽  
Author(s):  
M. D'Olne Campos ◽  
A. Gouskov ◽  
L. Gouskov ◽  
J.-C. Pons
Keyword(s):  
Recombination Radiation

Infrared Television Microscope for the Investigation of Recombination Radiation and the Optical Properties of Semiconductors

1970 ◽  
pp. 98-101
Author(s):  
N. L. Artem’ev ◽  
V. S. Bagaev ◽  
O. V. Gogolin ◽  
Yu. A. Efimov ◽  
B. D. Kopylovskii
Keyword(s):  
Optical Properties ◽  
Recombination Radiation

Use of Electron Probes in the Study of Recombination Radiation

1964 ◽  
Vol 35 (8) ◽  
pp. 2439-2442 ◽  
Author(s):  
David B. Wittry ◽  
David F. Kyser
Keyword(s):  
Recombination Radiation
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