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

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 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.

The TopHat Cosmic Microwave Background Anisotropy Experiment

2005 ◽  
Vol 201 ◽  
pp. 65-70
Author(s):  
Robert F. Silverberg ◽  
Keyword(s):  
Cosmic Microwave Background ◽  
Large Scale ◽  
Background Radiation ◽  
High Sensitivity ◽  
Microwave Background ◽  
Long Duration ◽  
Cosmic Microwave Background Anisotropy ◽  
Microwave Background Radiation ◽  
The Universe ◽  
Large Scale Structure Formation

We have developed a balloon-borne experiment to measure the Cosmic Microwave Background Radiation anisotropy on angular scales from ˜50° down to ˜20′. The instrument observes at frequencies between 150 and 690 GHz and will be flown on an Antarctic circumpolar long duration flight. To greatly improve the experiment performance, the front-end of the experiment is mounted on the top of the balloon. With high sensitivity, broad sky coverage, and well-characterized systematic errors, the results of this experiment can be used to strongly constrain cosmological models and probe the early stages of large-scale structure formation in the Universe.

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

COSMOLOGY CONFRONTS THE COSMIC MICROWAVE BACKGROUND

1995 ◽  
Vol 10 (08) ◽  
pp. 1091-1124 ◽  
Author(s):  
PAUL J. STEINHARDT
Keyword(s):  
Cosmic Microwave Background ◽  
Initial Conditions ◽  
Experimental Tests ◽  
Inflationary Model ◽  
Microwave Background ◽  
Cosmic Microwave Background Anisotropy ◽  
Physical Laws ◽  
The Universe ◽  
Fundamental Physical ◽  
Physical Principles

Observational tests during the next decade may determine if the evolution of the Universe can be understood from fundamental physical principles, or if special initial conditions, coincidences, and new, untestable physical laws must be invoked. The inflationary model of the Universe is an important example of a predictive cosmological theory based on physical principles. In this article, we discuss the distinctive fingerprint that inflation leaves on the cosmic microwave background anisotropy. We then suggest a series of five milestone experimental tests of the microwave background which could determine the validity of the inflationary hypothesis within the next decade.

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