„In the beginning of 1917, two solutions of the field equations for a homogeneous isotropic universe had been found, which I… call the solutions "A" and "B."… at that time only static solutions were looked for. It was thought that the universe must be a stable structure… In one of these solutions (B) the average density was zero, it was empty; the other one (A) had a finite density…. In B, to get the real universe, we should have to put in a few galactic systems, in A we should have to condense the evenly distributed matter into galactic systems. The universe A… has an average density, but no expansion. It is therefore called the static universe. B, on the other hand… expands, and it could only parade in the garb of a static universe because there is nothing in it to show the expansion. B is therefore called the empty universe. Thus we had two approximations : the static universe with matter and without expansion, and the empty one without matter and with expansion. The actual universe… has both matter and expansion… In 1917… the actual value of the density was still entirely unknown, and the expansion had not yet been discovered.“

Kosmos (1932), Above is Beginning Quote of the Last Chapter: Relativity and Modern Theories of the Universe -->

Obtido da Wikiquote. Última atualização 3 de Junho de 2021. História
Willem de Sitter photo
Willem de Sitter
1872 - 1934

Citações relacionadas

Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo

„Is the density anywhere near that corresponding to the static universe, or is it so small that we can consider the empty universe as a good approximation?“

—  Willem de Sitter Dutch cosmologist 1872 - 1934

Kosmos (1932), Above is Beginning Quote of the Last Chapter: Relativity and Modern Theories of the Universe -->

Frank Wilczek photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Willem de Sitter photo
Anaïs Nin photo
Alan Guth photo

„Inflation is a prequel to the conventional Big Bang theory. …It does provide a theory of the propulsion that drove the universe into this humungous episode of expansion which we call the Big Bang.“

—  Alan Guth American theoretical physicist and cosmologist 1947

Lecture 1: Inflationary Cosmology: Is Our Universe Part of a Multiverse? Part I.
The Early Universe (2012)

Willem de Sitter photo

„Your waistline may be spreading but you can't blame it on the expansion of the universe.“

—  Richard H. Price American physicist 1943

as quoted by Zeeya Merali in Cosmic expansion is not to blame for expanding waistlines http://www.newscientist.com/article/mg18825194.800-cosmic-expansion-is-not-to-blame-for-expanding-waistlines.html, New Scientist, 1 October 2005.

Henri-Frédéric Amiel photo

„Action limits us; whereas in the state of contemplation we are endlessly expansive. Will localizes us; thought universalizes us.“

—  Henri-Frédéric Amiel Swiss philosopher and poet 1821 - 1881

8 March 1868
The will localizes us, thought universalizes us. My soul wavers between two, four, six general and contradictory conceptions, for it obeys all the great instincts of human nature, and aspires to the absolute, which can only be realized by a succession of contraries.
As translated in The Private Journal of Henri Frédéric Amiel (1935), p. 238
Journal Intime (1882), Journal entries
Contexto: Action limits us; whereas in the state of contemplation we are endlessly expansive. Will localizes us; thought universalizes us. My soul wavers between half a dozen antagonistic general conceptions, because it is responsive to all the great instincts of human nature, and its aspiration is to the absolute, which is only to be reached through a succession of contraries. It has taken me a great deal of time to understand myself, and I frequently find myself beginning over again the study of the oft-solved problem, so difficult is it for us to maintain any fixed point within us. I love everything, and detest one thing only — the hopeless imprisonment of my being within a single arbitrary form, even were it chosen by myself. Liberty for the inner man is then the strongest of my passions — perhaps my only passion. Is such a passion lawful? It has been my habit to think so, but intermittently, by fits and starts. I am not perfectly sure of it.

Terry Pratchett photo
Alan Guth photo

Tópicos relacionados