Polarimetry of the Cosmic Microwave Background from the Antarctic Plateau

2002 ◽  
Vol 19 (3) ◽  
pp. 313-317
Author(s):  
G. Sironi ◽  
E. Battistelli ◽  
G. Boella ◽  
F. Cavaliere ◽  
M. Gervasi ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Thermal History ◽  
Microwave Background ◽  
Terra Nova Bay ◽  
Celestial Pole ◽  
History Of ◽  
The Antarctic ◽  
The Universe ◽  
Recombination Epoch ◽  
Linear Polarisation

AbstractDetection of linear polarisation at a level of 1 ppm or less, associated to the anisotropy of the cosmic microwave background, will confirm the cosmological origin of the observed anisotropy and provide information on the thermal history of the universe between the recombination epoch and now. In particular, detection of polarisation can help in deciding if the evolution of the universe included a reionisation epoch. We present the Mk3 model of our correlation polarimeter, an improved version of a system which has already been used for observations of the region of sky around the South Celestial Pole from Antarctica (in 1994 at Terra Nova Bay and in 1998 at Dome C).

scholarly journals Cosmic Microwave Background Anisotropy at Degree Angular Scales and the Thermal History of the Universe

1997 ◽  
Vol 480 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Paolo de Bernardis ◽  
Amedeo Balbi ◽  
Giancarlo De Gasperis ◽  
Alessandro Melchiorri ◽  
Nicola Vittorio
Keyword(s):  
Cosmic Microwave Background ◽  
Thermal History ◽  
Microwave Background ◽  
Cosmic Microwave Background Anisotropy ◽  
History Of ◽  
The Universe

scholarly journals Primordial nucleosynthesis constraints on high-z energy releases

2020 ◽  
Vol 499 (4) ◽  
pp. 5653-5655
Author(s):  
Gianfranco De Zotti ◽  
Matteo Bonato
Keyword(s):  
Energy Density ◽  
Cosmic Microwave Background ◽  
Thermal History ◽  
Microwave Background ◽  
Primordial Nucleosynthesis ◽  
Specific Entropy ◽  
History Of ◽  
Model Independent ◽  
Electron Photon ◽  
The Universe

ABSTRACT The cosmic microwave background (CMB) spectrum provides tight constraints on the thermal history of the universe up to z ∼ 2 × 106. At higher redshifts, thermalization processes become very efficient so that even large energy releases do not leave visible imprints in the CMB spectrum. In this paper, we show that the consistency between the accurate determinations of the specific entropy at primordial nucleosynthesis and at the electron–photon decoupling implies that no more than 7.8 per cent of the present-day CMB energy density could have been released in the post-nucleosynthesis era. As pointed out by previous studies, primordial nucleosynthesis complements model independent constraints provided by the CMB spectrum, extending them by two orders of magnitude in redshift.

Probing the Reionization History of the Universe using the Cosmic Microwave Background Polarization

2003 ◽  
Vol 583 (1) ◽  
pp. 24-32 ◽  
Author(s):  
Manoj Kaplinghat ◽  
Mike Chu ◽  
Zoltan Haiman ◽  
Gilbert P. Holder ◽  
Lloyd Knox ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Microwave Background Polarization ◽  
History Of ◽  
The Universe

scholarly journals PROBING THE ANISOTROPIC EXPANSION HISTORY OF THE UNIVERSE WITH COSMIC MICROWAVE BACKGROUND

2012 ◽  
Vol 27 (24) ◽  
pp. 1250144 ◽  
Author(s):  
RANJITA K. MOHAPATRA ◽  
P. S. SAUMIA ◽  
AJIT M. SRIVASTAVA
Keyword(s):  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Microwave Background ◽  
Anisotropic Expansion ◽  
Microwave Background Radiation ◽  
Expansion Stage ◽  
History Of ◽  
Density Perturbations ◽  
Expansion Of The Universe ◽  
The Universe

We propose a simple technique to detect any anisotropic expansion stage in the history of the universe starting from the inflationary stage to the surface of last scattering from the cosmic microwave background radiation (CMBR) data. We use the property that any anisotropic expansion in the universe would deform the shapes of the primordial density perturbations and this deformation can be detected in a shape analysis of superhorizon fluctuations in CMBR. Using this analysis we obtain the constraint on any previous anisotropic expansion of the universe to be less than about 35%.

scholarly journals Cosmic microwave background constraints in light of priors over reionization histories

2018 ◽  
Vol 617 ◽  
pp. A96 ◽  
Author(s):  
Marius Millea ◽  
François Bouchet
Keyword(s):  
Cosmic Microwave Background ◽  
Principal Component ◽  
Microwave Background ◽  
General Applicability ◽  
Primordial Power Spectrum ◽  
History Of ◽  
Cosmic Microwave Background Data ◽  
Correlated Parameters ◽  
The Universe ◽  
Non Parametric

Non-parametric reconstruction or marginalization over the history of reionization using cosmic microwave background data necessarily assumes a prior over possible histories. We show that different but reasonable choices of priors can shift current and future constraints on the reionization optical depth, τ, or correlated parameters such as the neutrino mass sum, Σmν, at the level of 0.3–0.4 σ, meaning that this analysis is somewhat prior dependent. We point out some prior-related problems with the commonly used principal component reconstruction, concluding that the significance of some recent hints of early reionization in Planck 2015 data has been overestimated. We also present the first non-parametric reconstruction applied to newer Planck intermediate (2016) data and find that the hints of early reionization disappear entirely in this more precise dataset. These results limit possible explanations of the EDGES 21cm signal which would have also significantly reionized the universe at z  >   15. Our findings about the dependence on priors motivate the pursuit of improved data or searches for physical reionization models which can reduce the prior volume. The discussion here of priors is of general applicability to other non-parametric reconstructions, for example of the primordial power spectrum, of the recombination history, or of the expansion rate.

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