G. Daŭtcourt

Max Planck Institute for Gravitational Physics

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Klaus Richter

Fraunhofer Institute for Factory Operation and Automation

Herbert Goering

Otto-von-Guericke University Magdeburg

Ernst Schmützer

Friedrich Schiller University Jena

Dieter Klaua

Würth Elektronik (Germany)

Eberhard Hofmann

Leipzig University

Hans Bandemer

TU Bergakademie Freiberg

Andreas Bellmann

Internationale Akademie Berlin

Harry Pfeifer

RWTH Aachen University

Adolf Zschünke

Federal Institute For Materials Research and Testing

Heinrich Kindler

Max Planck Institute for Astrophysics

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Würth Elektronik (Germany)

520

Internationale Akademie Berlin

448

Laboratoire de Chimie Moléculaire et Thioorganique

353

GP Forschungsgruppe

277

Biologie Labor

224

Textron Systems (United Kingdom)

187

Institut für Technische und Angewandte Physik (Germany)

146

Landesinstitut für Lehrerbildung und Schulentwicklung

Max Planck Institute for Astrophysics

Klein Buendel (United States)

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Frontmatter

De Gruyter eBooks (1976)

John Cunninuham Vektoren G. Daŭtcourt Relativistische Astrophysik Albert Einstein Grundzüge Der Relativitätstheorie

10.1515/9783112541166-fm

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Fluctations in the cosmic microwave background arising from low‐frequency gravitational radiation

Astronomische Nachrichten (1974)

G. Daŭtcourt

Abstract Intense low‐frequency intergalactic gravitational radiation with wave lengths λ smaller than the H UBBLE distance λ H ≌ 3000 (100/ H 0 ) Mpc but not exceedingly small compared to λ H . generates anisotropies in the microwave background radiation. One contribution results from the local wave field and produces mainly a quadrupole‐type temperature variation on the sky. Available data on large‐scale microwave fluctuations do not exclude appreciable amounts of gravitational background radiation in the Megaparsec wave band. A more sensitive test is provided by a second far‐field contribution, which has a small angular scale. Its amplitude depends strongly on the ratio of the (present) rest mass density to the H UBBLE constant, if a cosmological origin of the blackbody radiation is assumed. In a low‐density universe, pre‐galactic C OMPTON scattering of the blackbody radiation is not able to reduce the fluctuations caused by the low‐frequency gravitational wave field. The recent small‐scale data by P ARIJSKIJ would allow only small amplitudes of gravitational waves with an energy density significantly below the critical cosmological density. On the other hand, in a high‐density universe, the small angular scale fluctuation in the blackbody radiation is completely damped out, and a gravitational radiation cosmos reaching the critical density is admitted. Independent of the matter density, the data by P ARIJSKIJ would confine gravitational background radiation to insignificant amplitudes if a discrete source model for the origin of the microwave background has to be assumed.

Black-body radiation

Cosmic background radiation

10.1002/asna.19742950303

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Frontmatter

De Gruyter eBooks (1973)

D Beine Kernkräfte Einführung Und Originaltexte Dieter Onken Steroide Zur Chemie Und Anwendung

10.1515/9783112566626-fm

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Frontmatter

De Gruyter eBooks (1973)

Rolf Borsdorf Manfred Scholz Werner Haberditzl Magnetochemie Gerhard Heber A Elementarteilchen

10.1515/9783112643686-fm

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Frontmatter

De Gruyter eBooks (1979)

Joachim Aüth Dietmar Genzow K.‐H. Heermann Photoelektrische Erst Hans Bandemer

10.1515/9783112643884-fm

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Frontmatter

De Gruyter eBooks (1972)

Rolf Bobsdorf Manfred Scholz Werner Haberditzl Magnetochemie A Elementarteilchen Heinz Ahrens

10.1515/9783112596562-fm

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REDSHIFT CUTOFF AND EVOLUTION EFFECT AT ORIGIN OF METAGALACTIC BACKGROUND RADIATION.

G. Daŭtcourt

Background radiation

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Small-Scale Variations in the Cosmic Microwave Background

Monthly Notices of the Royal Astronomical Society (1969)

G. Daŭtcourt

A discussion is given of some processes which produce fluctuations in the 3 °K radiation on a small angular scale |$(\leqslant 1^{\circ}).$| Apart from fluctuations caused by a primordial spectrum of spatial inhomogeneities in the matter and radiation densities, effects of scattering on the gravitational fields of clusters of galaxies as well as scattering by gravitational radiation of extremely large coherence or wave-lengths are considered. While scattering by static gravitational field perturbations may be neglected in most cases, scattering by gravitational radiation with large wave-lengths may produce variations on an observable level. The measurements by Conklin & Bracewell provide upper limits on the equivalent mass density of a gravitational radiation background for coherence lengths |$L \gt 1$| Mpc. The fluctuations may be strongly affected by electron scattering in ionized intergalactic matter.

10.1093/mnras/144.3.255

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Observational consequences of preinflationary structure.

Astronomische Gesellschaft Abstract Series (1992)

G. Daŭtcourt

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Sur la solution de l'équation d'Einstein $g_{\mu\ \ \nu\ ;\ \rho\atop +\ -\ \ \ \ } = 0$

G. Daŭtcourt

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