Characteristic microwave-background distortions from collapsing spherical domain walls

1990 ◽  
Vol 65 (18) ◽  
pp. 2229-2232 ◽  
Author(s):  
Guenter Goetz ◽  
Dirk Nötzold
Keyword(s):  
Domain Walls ◽  
Microwave Background ◽  
Spherical Domain

Gravitational repulsion of spherical domain walls

1994 ◽  
Vol 100 (2) ◽  
pp. 1023-1029 ◽  
Author(s):  
A. Barnaveli ◽  
M. Gogberashvili
Keyword(s):  
Domain Walls ◽  
Spherical Domain ◽  
Gravitational Repulsion

scholarly journals Evolution of spherical domain walls in solitonic symmetron models

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
Marzieh Peyravi ◽  
Nematollah Riazi ◽  
Francisco S. N. Lobo
Keyword(s):  
Domain Walls ◽  
Spherical Domain

scholarly journals Nonlocal Quantum Effects in Cosmology

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Yurii V. Dumin
Keyword(s):  
Early Universe ◽  
Large Scale ◽  
Domain Walls ◽  
Early Stage ◽  
Topological Defects ◽  
Anomalous Behavior ◽  
Quantum Nonlocality ◽  
Ultracold Gases ◽  
Laboratory Studies ◽  
Microwave Background

Since it is commonly believed that the observed large-scale structure of the universe is an imprint of quantum fluctuations existing at the very early stage of its evolution, it is reasonable to pose the question: do the effects of quantum nonlocality, which are well established now by the laboratory studies, manifest themselves also in the early universe? We try to answer this question by utilizing the results of a few experiments, namely, with the superconducting multi-Josephson-junction loops and the ultracold gases in periodic potentials. Employing a close analogy between the above-mentioned setups and the simplest one-dimensional Friedmann-Robertson-Walker cosmological model, we show that the specific nonlocal correlations revealed in the laboratory studies might be of considerable importance also in treating the strongly nonequilibrium phase transitions of Higgs fields in the early universe. Particularly, they should substantially reduce the number of topological defects (e.g., domain walls) expected due to independent establishment of the new phases in the remote spatial regions. This gives us a hint on resolving a long-standing problem of the excessive concentration of topological defects, inconsistent with observational constraints. The same effect may be also relevant to the recent problem of the anomalous behavior of cosmic microwave background fluctuations at large angular scales.

DYNAMICS OF FERROMAGNETIC WALLS: GRAVITATIONAL PROPERTIES

2005 ◽  
Vol 14 (03n04) ◽  
pp. 521-541 ◽  
Author(s):  
L. CAMPANELLI ◽  
P. CEA ◽  
G. L. FOGLI ◽  
L. TEDESCO
Keyword(s):  
Domain Wall ◽  
Large Scale ◽  
Domain Walls ◽  
Background Radiation ◽  
Ideal Gas ◽  
Microwave Background ◽  
Electroweak Phase Transition ◽  
Microwave Background Radiation ◽  
The Universe ◽  
Negligible Contribution

We discuss a new mechanism which allows domain walls produced during the primordial electroweak phase transition. We show that the effective surface tension of these domain walls can be made vanishingly small due to a peculiar magnetic condensation induced by fermion zero modes localized on the wall. We find that in the perfect gas approximation the domain wall network behaves like a radiation gas. We consider the recent high-red shift supernova data and we find that the corresponding Hubble diagram is compatible with the presence in the Universe of an ideal gas of ferromagnetic domain walls. We show that our domain wall gas induces a completely negligible contribution to the large-scale anisotropy of the microwave background radiation.

Gravitational Field of Spherical Domain Walls

2000 ◽  
Vol 32 (9) ◽  
pp. 1757-1766 ◽  
Author(s):  
Farook Rahaman ◽  
Subenoy Chakraborty
Keyword(s):  
Gravitational Field ◽  
Domain Walls ◽  
Spherical Domain

Gravitational repulsion of spherical domain walls

1994 ◽  
Vol 26 (11) ◽  
pp. 1117-1129 ◽  
Author(s):  
Andro Barnaveli ◽  
Merab Gogberashvili
Keyword(s):  
Domain Walls ◽  
Spherical Domain ◽  
Gravitational Repulsion

scholarly journals Microwave background distortions from domain walls

1991 ◽  
Vol 351 (3) ◽  
pp. 645-661 ◽  
Author(s):  
Guenter Goetz ◽  
Dirk Nötzold
Keyword(s):  
Domain Walls ◽  
Microwave Background

Collapse of nearly spherical domain walls

1989 ◽  
Vol 39 (12) ◽  
pp. 3576-3578 ◽  
Author(s):  
Lawrence M. Widrow
Keyword(s):  
Domain Walls ◽  
Spherical Domain

The direct determination of magnetic domain wall profiles using a split detector STEM

1978 ◽  
Vol 36 (1) ◽  
pp. 466-467
Author(s):  
J.N. Chapman ◽  
P.E. Batson ◽  
E.M. Waddell ◽  
R.P. Ferrier
Keyword(s):  
Electron Microscope ◽  
Domain Wall ◽  
Transmission Electron Microscope ◽  
Domain Walls ◽  
Photographic Plate ◽  
Magnetic Domain ◽  
Direct Determination ◽  
Quantitative Information ◽  
Scanning Transmission Electron Microscope ◽  
Transmission Electron

By far the most commonly used mode of Lorentz microscopy in the examination of ferromagnetic thin films is the Fresnel or defocus mode. Use of this mode in the conventional transmission electron microscope (CTEM) is straightforward and immediately reveals the existence of all domain walls present. However, if such quantitative information as the domain wall profile is required, the technique suffers from several disadvantages. These include the inability to directly observe fine image detail on the viewing screen because of the stringent illumination coherence requirements, the difficulty of accurately translating part of a photographic plate into quantitative electron intensity data, and, perhaps most severe, the difficulty of interpreting this data. One solution to the first-named problem is to use a CTEM equipped with a field emission gun (FEG) (Inoue, Harada and Yamamoto 1977) whilst a second is to use the equivalent mode of image formation in a scanning transmission electron microscope (STEM) (Chapman, Batson, Waddell, Ferrier and Craven 1977), a technique which largely overcomes the second-named problem as well.

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