TomS
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Nein, es gibt nicht das kosmologische Prinzip. Du findest unterschiedliche Formulierungen mit nicht deckungsgleichen Bedeutungen, aber es macht einen erheblichen Unterschied, welches man meint und mit welchen Argumenten man für oder gegen welches argumentiert. Schlimmer noch, du findest Argumentationen, die "das kosmologische Prinzip" verwenden, kritisieren etc., ohne das erklärt wird, welche Formulierung denn gemeint ist.Natürlich ist das falsch, und natürlich gibt es das.
Was oben angeführt wurde "The Cosmological Principle assumes that the part of the universe we can see is viewed as a ‘fair sample’ of what we expect the rest of the universe to be like …" ist eigentlich das Kopernikanische Prinzip.
Zu letzterem:
Copernican principle - Wikipedia
en.wikipedia.org
In physical cosmology, the Copernican principle states that humans, on the Earth or in the Solar System, are not privileged observers of the universe, that observations from the Earth are representative of observations from the average position in the universe.
Bondi - der das zuerst im Rahmen der Kosmologie wieder aufgriff
First amongst these arguments is what may be called the Copernican principle-that the Earth is not in a central, specially favoured position. This principle has become accepted by all men of science, and it is only a small step from this principle to the statement that the Earth is in a typical position, and a wide interpretation of the word 'typical' renders this statement equivalent to the 'narrow' cosmological principle.
Frank Wilczek:
The Copernican Principle or Cosmic Mediocrity... states, basically, that Earth does not occupy a privileged place in the universe. Universality asserts more, namely that there are no privileged places or times.
Das ist eine wesentliche Verknüpfung zwischen beiden, in der zunächst die nicht-Identität beider Prinzipien klar wird, jedoch die Bedeutung von Isotropie nicht präzisiert wird (im gesamten Text).The Copernican principle proposes the hypothesis that we do not occupy a special place in the Universe; we are merely typical observers. Equivalent, there are no special parts of the Universe, and statistically, all regions of the Universe look the same. As explained in the following Section, when associated with isotropy, the Copernican hypothesis implies a homogeneous Universe and, consequently, can be interpreted as a weak version of the Cosmological principle.
Cosmological principle - Wikipedia
en.wikipedia.org
Das geht auf jeden Fall weiter (s.o.), jedoch ...In modern physical cosmology, the cosmological principle is the notion that the spatial distribution of matter in the universe is uniformly isotropic and homogeneous when viewed on a large enough scale ...
Das ist jetzt wieder der Schritt zurück zum Kopernikanischen Prinzip.Astronomer William Keel explains: The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the universe is knowable and is playing fair with scientists.
Die Autoren des Artikels liefern also eine lose Sammlung unterschiedlicher Prinzipien, ohne diese einzuordnen oder hinsichtlich ihrer Bedeutung in Beziehung zu setzen; nichts greifbares also ...
In
Thoughts on the cosmological principle
diskutiert Dominik Schwarz dankenswerter Weise verschiedene Varianten:
- Weak Copernican Principle: We are typical.
- Strong Copernican Principle: We are not distinguished.
- Cosmological Principle: All physical quantities measured by a comoving observer are spatially homogeneous and isotropic.
- Statistical Cosmological Principle: The distribution of light and matter in the Universe is statistically isotropic around any point, apart from anisotropies of local origin.
- Minimal Cosmological Principle: There exists a class of observers that see a statistically isotropic Universe, apart from anisotropies of local origin
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