Constraints on the thermal history of the universe from the cosmic microwave background spectrum

1991 ◽  
Vol 379 ◽  
pp. 1 ◽  
Author(s):  
C. Burigana ◽  
L. Danese ◽  
G. de Zotti
Keyword(s):  
Cosmic Microwave Background ◽  
Thermal History ◽  
Microwave Background ◽  
Background Spectrum ◽  
History Of ◽  
The Universe

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.

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 Microwave Background Spectrum - Survey of Recent Results

1977 ◽  
Vol 74 ◽  
pp. 319-325 ◽  
Author(s):  
E. I. Robson ◽  
P. E. Clegg
Keyword(s):  
Wavelength Region ◽  
Thermodynamic Temperature ◽  
Spectral Measurements ◽  
Microwave Background ◽  
Queen Mary College ◽  
Background Spectrum ◽  
Mountain Site ◽  
History Of ◽  
The Universe ◽  
Balloon Measurements

For those enamoured of the primaeval fireball, the relict radiation has proved a tantalising mistress. Since the famous discovery in 1965, by Penzias and Wilson, of an excess antenna temperature consistent with cosmological expectations, many observers have succeeded in measuring a flux consistent with a thermodynamic temperature of ∼3K. Until recently, however, no direct spectral measurements had been made at wavelengths shorter than the Planckian peak corresponding to radiation at this temperature. At such wavelengths atmospheric emission and absorption are overwhelming from even the highest mountain site and observations must be made from at least balloon platforms. The pioneering broadband rocket and balloon measurements covering this wavelength region produced consternation when excessively high fluxes were reported; successive flights gradually eliminated the excess, emphasising the practical difficulties of such observations. A review of this phase of the pursuit is given by Blair1. Nevertheless, it is upon direct submillimetre measurement of the spectral density Iν that confidence in the interpretation of the longer wavelength results must reside. The outcome of the first such measurement, by Queen Mary College in 1974, seemed completely to justify such confidence. Unfortunately, the subsequent observations by Berkeley, although leading to the same conclusion about the value of the thermodynamic temperature, were so discrepant in detail from those of QMC as once again to raise doubts. We have since been eagerly awaiting the results of observations by independent groups but these have been frustrated by instrumental failures. We attempt here to assess the present situation. We conclude that although present measurements indicate a flux not inconsistent with a Planckian spectrum corresponding to a temperature of ∼3K, they do not demand such an interpretation. Moreover, because we may not actually expect a Planckian curve from a fireball, very much more detailed information is needed to obtain a view of the early thermal 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 The Background Radiation in Isotropic World Models

1969 ◽  
Vol 22 (1) ◽  
pp. 59 ◽  
Author(s):  
AD Payne
Keyword(s):  
Thermal History ◽  
General Equation ◽  
Background Radiation ◽  
Radio Spectrum ◽  
Numerical Results ◽  
Background Intensity ◽  
Background Spectrum ◽  
History Of ◽  
Homogeneous Universe ◽  
The Universe

A general equation for the extragalactic background intensity is derived for the general case of an isotropic homogeneous universe. The extragalactic radio spectrum depends critically on the thermal history of the universe and numerical results have been obtained for different possible models. A brief discussion is given on the conclusions drawn from the comparison of these results with the observed background spectrum.

Sign in / Sign up

Export Citation Format

Share Document