"Cosmology After Half a Century: Fifty Years After Einstein s Paper of 1917, Cosmology is in a Supremely Interesting State in Science" found in "Science".

McCrea, Sir William Hunter.

Edité par Published by the American Association for the Advancement of Science., 1968

A propos de cet article

**The Horizon Problem in Cosmology** McCrea, Sir William Hunter. "Cosmology After Half a Century: Fifty Years After Einstein s Paper of 1917, Cosmology is in a Supremely Interesting State in Science" found in "Science", 1968, Volume 160, Number 3834, 21 June 1968, pp. 1295-1299 in the issue of pp 1273-1388, Original wrappers. Published by the American Association for the Advancement of Science. Two old stickers on the wrappers: one small sticker at the bottom of the front wrapper and another at the top of the rear wrapper. VG copy. McCrea identified that one of the most pressing issues in modern cosmology was the "horizon problem", identified here clearly for the first time. "Alpher et al. (1950) contains the earliest remarks (in passing) that we are aware of about this particle horizon problem. The terminology is due to Rindler (1956) which is an early discussion of horizons in general. Harrison also mentions the particle horizon problem in passing, but McCrea (1968 [the paper offered here]) and Misner (1969) contain the first clear statements we are aware of."--"The Beginning and Evolution of the Universe", by Bharat Ratra1 and Michael S. Vogeley, June 2007. [++]  ".McCrea.pursue(d) the steady-state theory rather than orthodox relativistic expanding theories. It would not be unfair to characterize these reasons as philosophical. From the very beginning of his work in the field, McCrea had sought to confront cosmological theory with observation, in part simply to restrain excursions of theorists imaginations, and in part to provide evidence for choosing between competing models. As the 1930s became 1940s, it became evident to him and other workers that observational tests for cosmological theory were not thick on the ground. While McCrea put aside his research during the war, he did not stop thinking about this central problem. When the Bondi-Gold theory came along, it offered distinct advantages over relativistic expanding universe theory in this regard. As McCrea would later note, The simple steady-state model was unique. On conceptual grounds this was … a high recommendation. On observational grounds, it rendered the model as vulnerable as possible to observational test (McCrea 1968, p. 1296 [the paper I am offering here]). Bondi and Gold had argued that their theory predicted several specific observations H-He ratios, galactic density counts, etc. which, if they failed, would contradict the theory. McCrea liked both the specificity of the predictions, and their logic. As he argued, correctly, predictions that are verified can only provide support for a theory, they cannot verify the theory itself. Contradictions, by contrast, rule out a theory tout court. Bondi, following Karl Popper, emphasized that steady-state was more scientific than relativistic expanding universe theory because it was specifically and directly falsifiable. McCrea appreciated this point about steady-state theory."--Complete Dictionary of Scientific Biography online.

N° de réf. du vendeur ABE-1700450901509

Détails bibliographiques

• Titre: "Cosmology After Half a Century: Fifty Years After Einstein s Paper of 1917, Cosmology is in a Supremely Interesting State in Science" found in "Science".
• Éditeur: Published by the American Association for the Advancement of Science.
• Date de parution: 1968
• Reliure: Soft cover
• État de l'article: Very Good
• Poids: 6 onces
• Catalogues du vendeur:
  • Astrophysics