Willem de Sitter

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Sitter, Willem de


Born May 6, 1872, in Sneek; died Nov. 19, 1934, in Leiden. Dutch astronomer.

De Sitter graduated from the University of Groningen. In 1897 he began work in photometry at the observatory on the Cape of Good Hope, where he developed a theory for the motion of the first four satellites of Jupiter. In 1908 he became a professor of astronomy and in 1919, director of the observatory of the University of Leiden. De Sitter created his own fundamental system of astronomical and geodetic constants. His works on the theory of relativity served as an impetus for the organization of an expedition to observe the solar eclipse of 1919. It was during this eclipse that the deviation of light rays passing near the sun was detected, a phenomenon that had been predicted by Einstein.


“The Expanding Universe.” Bulletin of the Astronomical Institutes of the Netherlands, 1930, vol. 5.


“Willem de Sitter.” Monthly Notices of the Royal Astronomical Society, 1935, vol. 95, no. 4.
References in periodicals archive ?
In particular, by using the correspondence between the de Sitter symmetry group in D-dimensions and the conformal group in an euclidean (D-1)-dimensional "boundary" space (Strominger, 2001), it is possible to calculate general important features of the system, such as the correlations functions of the fields that govern the dynamics of the inflationary Universe (Biagetti et al.
Zhai, On spacelike hypersurfaces with constant scalar curvature in the de Sitter space, Diff.
We opted for Unicenter TNG over point solutions because it provides a more complete view of the IT environment, and more flexibility," said De Sitter.
Spanou, "Localization of energy for a regular black hole solution in an asymptotically de Sitter spacetime geometry," Central European Journal of Physics, vol.
Cheng, Complete spacelike submanifolds in a De Sitter space with parallel mean curvature vector, Math.
For a specific value of [XI], we retrieve the space-time of constant curvature [13], which characterizes the de Sitter Universe when 3[LAMBDA] = R [14]:
n] has constant R, Zheng [15] proved that a compact spacelike hypersurface in a de Sitter space [S.
Although the baby would have low entropy, the total entropy of the system (mother de Sitter space plus baby) would be higher, preserving the second law.
When Dutch astronomer Willem de Sitter, in a 1930 review article, casually referred to several astronomers linking a galaxy's velocity to its distance, Hubble picked up his pen and reminded de Sitter who should receive the lion's share of the credit.
There are two distinct cosmologies that satisfy this condition: the de Sitter flat-universe cosmology and the dichotomous cosmology introduced in [2].