György Paál
György Paál (Budapest, 1934 – Budapest, 1992)[1] was a Hungarian astronomer and cosmologist.
Work
In the late 1950s Paál studied the quasar and galaxy cluster distributions. In 1970 from redshift quantization he came up with the idea that the Universe might have nontrivial topological structure.[2] [3] These are the oldest papers that associate real observations with the possibility that our universe could have nontrivial topology.[4]
In 1992, G. Paal, et al. [5] and A. Holba, et al. [6] reanalyzed the redshift data from a fairly large sample of galaxies and concluded that there was an unexplained periodicity of redshifts.
From the observed galaxy distribution in 1992 Paal et al.[5] suggested non-zero cosmological constant. Two years later in another paper[7] they suggested .[8] Though later observations confirmed this value,[9] the redshift quantization of quasars, which Paál et al. (1992)'s arguments were based on, is generally considered to be a false-positive caused by selection effect.[10]
Membership
Cosmological Committee of IAU[1]
Awards
László Detre award.
See also
- Accelerating universe
- Cosmological constant
- Dark energy
- Redshift quantization
- Universe
- Shape of the universe
References
- ^ a b http://members.iif.hu/visontay/ponticulus/rovatok/limes/bartha-magyar-csillagaszok.html
- ^ Paál, G. (1970). "Red shifts and Quasars". Science Journal. 6 (6): 101.
- ^ Paál, G. (1971). "The global structure of the universe and the distribution of quasi-stellar objects". Acta Physica Academiae Scientarium Hungaricae. 30: 51. Bibcode:1971AcPhH..30...51P. doi:10.1007/bf03157173.
- ^ Luminet, Jean-Pierre; Lachièze-Rey, Marc (1995). "Cosmic Topology". Physics Reports. 254 (3): 135–214. arXiv:gr-qc/9605010. Bibcode:1995PhR...254..135L. doi:10.1016/0370-1573(94)00085-h.
- ^ a b Paál, G.; Horváth, I.; Lukács, B. (1992). "Inflation and compactification from Galaxy redshifts?". Astrophysics and Space Science. 191: 107. Bibcode:1992Ap&SS.191..107P. doi:10.1007/BF00644200.
- ^ Holba, Ágnes; Horváth, I.; Lukács, B.; Paál, G. (1992). "Cosmological parameters and redshift periodicity". Astrophysics and Space Science. 198: 111. Bibcode:1992Ap&SS.198..111H. doi:10.1007/BF00644305. See also reference to Broadhurst, T. J.; Ellis, R. S.; Koo, D. C.; Szalay, A. S. (1990). "Large-scale distribution of galaxies at the Galactic poles". Nature. 343 (6260): 726. Bibcode:1990Natur.343..726B. doi:10.1038/343726a0.
- ^ Holba, Ágnes; Horváth, I.; Lukács, B.; Paál, G. (1994). "Once more on quasar periodicities". Astrophysics and Space Science. 222: 65. Bibcode:1994Ap&SS.222...65H. doi:10.1007/BF00627083.
- ^ Horváth, I. (2012). "Early publications about nonzero cosmological constant". arXiv:1203.6903. Bibcode:2012arXiv1203.6903H.
{{cite journal}}: Cite journal requires|journal=(help) - ^ Perlmutter, S.; et al. (June 1999). "Measurements of Omega and Lambda from 42 High-Redshift Supernovae". The Astrophysical Journal. 517 (2): 565–586. arXiv:astro-ph/9812133. Bibcode:1999ApJ...517..565P. doi:10.1086/307221.
- ^ Tang, S. M.; Zhang, S.N. (2005). "Critical Examinations of QSO Redshift Periodicities and Associations with Galaxies in Sloan Digital Sky Survey Data". The Astrophysical Journal. 633: 41–51. Bibcode:2005ApJ...633...41T. doi:10.1086/432754.