Final Things

  • Malcolm S. Longair
Part of the Astronomy and Astrophysics Library book series (AAL)

Abstract

In the course of last 19 chapters, we have attempted to tie together many diverse observations and facts about the Universe into a self-consistent picture, within the context of the standard Big Bang scenario. It is, however, incomplete in a number of important ways. A useful comparison may be drawn with the history of our understanding of the origin of the chemical elements, a pleasant analogy drawn to my attention by Dr. Martin Harwit. In the 1930s, the origin of the chemical elements was a mystery. The tools were not available to understand the physical processes by which the synthesis of the chemical elements could have taken place. They might well have been laid down primordially by processes which took place in the inaccessible early Universe. The picture changed dramatically as the role of nuclear processes and the physics of the early Universe became better understood. One of the key events was the discovery of the triple-α resonance by Hoyle in 1953, which showed how the barriers to the synthesis of carbon from three helium nuclei in the central regions of stars could be overcome. Over the succeeding years, Burbidge, Burbidge, Fowler and Hoyle and Cameron elucidated the processes by which the chemical elements could be synthesised in stars. There remained the problem of the synthesis of light elements, such as helium and deuterium, but this was resolved with the realisation that they could be synthesised by non-equilibrium processes in first few minutes of the Big Bang, a topic dealt with in some detail in Chap. 10. It is now univerally accepted that there is no need for the chemical abundances of the elements to be laid down primordially - they can be accounted for by physical processes which take place naturally in the course of primordial and stellar evolution. The analogy with the problems of contemporary astrophysical cosmology is that it remains to be seen what parts of the most promising scenarios for the origin of galaxies and the large-scale structure of the Universe will be explainable by physical processes which have not yet been established by laboratory experiments, which can be established convincingly by astronomical observations, and which may remain inaccessible to us. To put it another way, what is the minimum set of axioms needed in order to account for the Universe as we know it today? As we will discuss, it might turn out that some parts of the story are simply beyond what can be treated by the physical tools we are likely to possess and then some reasonable set of initial conditions would have to be adopted. On the other hand, optimists, such as the present author, believe that precise astronomical observations and their judicious interpretation are likely to be very fruitful routes to understanding physical processes which cannot be reproduced in the laboratory. Indeed, this is a belief which is held fervently by many of us.

In this final chapter, some of these uncharted areas are surveyed. We begin with topics which are well within current and future observational capababil-ities, and then deal with deeper and more difficult issues. Specifically, these topics are:
  • Can the vast range of observations of galaxies throughout the redshift interval 0 < z < 5 be reconciled on an empirical basis with some overall scenario for the formation of galaxies and larger-scale structures?.

  • What is the origin of the rotation of galaxies and their magnetic fields?.

  • What are the essential features of theories of the very early Universe required by our analysis of the problems of astrophysical cosmology and the formation of galaxies?

These are somewhat diverse topics, but they have been lurking in the background of the astrophysical discussions of much of this book.

Keywords

Torque Recombination Helium Deuterium Tral 

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Reference

  1. Aragón-Salamanca, A., Ellis, R.S., Couch, W.J. and Carter, D. (1993). MNRAS, 262, 764.ADSGoogle Scholar
  2. Barnes, J. and Efstathiou, G. (1987). ApJ, 319, 575.ADSCrossRefGoogle Scholar
  3. Barrow, J.D. and Tipler, F.J. (1986). The Anthropic Cosmological Principle. Oxford: Oxford University Press.Google Scholar
  4. Best, P.N., Longair, M.S. and Röttgering, H.J.A. (1998). MNRAS, 295, 549.ADSCrossRefGoogle Scholar
  5. Biermann, L. (1950). Z. Naturforsch., 5a, 65.MathSciNetADSMATHGoogle Scholar
  6. Bludman, S.A. and Ruderman, M. (1977). Phys. Rev. Letts., 38, 255.ADSCrossRefGoogle Scholar
  7. Butcher, H. and Oemler, A., Jr. (1978). ApJ, 219, 18.ADSCrossRefGoogle Scholar
  8. Carter, B. (1974). In Confrontation of Cosmological Theories with Observational Data, (ed. M.S. Longair), 291. Dordrecht: D. Reidel Publishing Company.Google Scholar
  9. Davies, R.L., Efstathiou, G., Fall, S.M., Illingworth, G. and Schechter, P.L. (1983). ApJ, 266, 41.ADSCrossRefGoogle Scholar
  10. Dey, A. (1997). In The Hubble Space Telescope and the High Redshift Universe, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 373. Singapore: World Scientific Publishing Co.Google Scholar
  11. Dickenson, M. (1997). In The Hubble Space Telescope and the High Redshift Uni¬verse, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 207. Singapore: World Scientific Publishing Co.Google Scholar
  12. Dressier, A. (1994). ARAA, 22, 185.ADSCrossRefGoogle Scholar
  13. Dressier, A., Oemler, A. Jr., Couch, W.J., Smail, I., Ellis, R.G., Barger, A., Butcher, H., Poggianti, B.M. and Sharpies, R.M. (1997). ApJ, 490, 577.ADSCrossRefGoogle Scholar
  14. Dressier, A. and Smail, I. (1997). In The Hubble Space Telescope and the High Redshift Universe, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 185. Singapore: World Scientific Publishing Co.Google Scholar
  15. Dunlop, J., Peacock, J., Spinrad, H., Dey, A., Jimenez, R., Stern, D. and Windhorst, R. (1996). Nature, 381, 581.ADSCrossRefGoogle Scholar
  16. Efstathiou, G. (1995). In Galaxies in the Young Universe, (eds. H. Hippelein, K. Meisenheimer and H.-J. Roser), 299. Berlin: Springer-Verlag.Google Scholar
  17. Ellis, R.G., Smail, I., Dressier, A., Couch, W.J., Oemler, A., Butcher, H. and Sharpies, R.M. (1997). ApJ, 483, 582.ADSCrossRefGoogle Scholar
  18. Fall, S.M. (1983). In Internal Kinematics and Dynamics of Galaxies, (ed. E. Athana-ssoula), 391. Dordrecht: D. Reidel Publishing Co.Google Scholar
  19. Fall, S.M. and Efstathiou, G. (1980). MNRAS, 193, 189.ADSGoogle Scholar
  20. Ferguson, H.C. (1997). In The Hubble Space Telescope and the High Redshift Uni¬verse, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 15. Singapore: World Scientific Publishing Co.Google Scholar
  21. Freeman, K.C. (1970). ApJ, 160, 811.ADSCrossRefGoogle Scholar
  22. Fukugita, M., Hogan, C.J. and Peebles, P.J.E. (1996). Nature, 381, 489.ADSCrossRefGoogle Scholar
  23. Giavalisco, M., Steidel, C.C., Adelberger, K.L., Pettini, M. and Dickenson, M.E. (1997). In The Hubble Space Telescope and the High Redshift Universe, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 25. Singapore: World Scientific Publishing Co.Google Scholar
  24. Gribben, J. and Rees, M.J. (1989). Dark Matter, Mankind and Anthropic Cosmol¬ogy. New York: Bantam Books.Google Scholar
  25. Gunn, J.E. (1978). In Observational Cosmology by J.E. Gunn, M.S. Longair and M.J. Rees, 1. Geneva: Geneva Observatory Publications.Google Scholar
  26. Guth, A. (1981). Phys. Rev. D, 23, 347.ADSCrossRefGoogle Scholar
  27. Guth, A. (1997). The Inflationary Universe. The Quest for a New Theory of Cosmic Origins. Reading, MA: Addison-Wesley.Google Scholar
  28. Hausman, M.A. and Ostriker, J.P. (1978). ApJ, 224, 320.ADSCrossRefGoogle Scholar
  29. Hernquist, L. and Mihos, J.C. (1995). ApJ, 448, 41.ADSCrossRefGoogle Scholar
  30. Im, M., Casertano, S., Griffiths, R.E. and Ratnatunga, K.U. (1995). ApJ, 441, 494.ADSCrossRefGoogle Scholar
  31. Jones, B.J.T (1973). ApJ, 181, 269.ADSCrossRefGoogle Scholar
  32. Jones, B.J.T. and Peebles, P.J.E. (1972). Comments Ap. Sp.Phys., 4, 121.ADSGoogle Scholar
  33. Kauffmann, G. and White, S.D.M. (1993). MNRAS, 261, 92.ADSGoogle Scholar
  34. Kippenhahn, R. and Weigert, A. (1990). Stellar Structure and Evolution. Berlin: Springer-Verlag.CrossRefMATHGoogle Scholar
  35. Kolb, E.W. and Turner, M.S. (1990). The Early Universe. Redwood City, Caifornia: Addison-Wesley Publishing Company.Google Scholar
  36. Kulsrud, R.M. (1997). In Critical Dialogues in Cosmology, (ed. N. Turok), 328. Singapore: World Scientific.Google Scholar
  37. Lacy, M., Miley, G., Rawlings, S., Saunders, R., Dickinson, M., Garrington, S., Maddox, S., Pooley, G., Steidel, C, Bremer, M.N., Cotter, G., van Oijk, R., Röttgering, H. and Warner, P. (1994). MNRAS, 271, 504.ADSGoogle Scholar
  38. Le Fèvre, O., Ellis, R.S., Lilly, S.J., Abraham, R.G., Brinchman, J., Schade, D., Broadhurst, T.J., Colless, M., Crampton, D., Glazebrook, K., Hammer, F. and Tresse, L. (1997). In The Hubble Space Telescope and the High Redshift Universe, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 25. Singapore: World Scientific Publishing Co.Google Scholar
  39. Lilly, S.J. (1988). ApJ, 333, L161.ADSCrossRefGoogle Scholar
  40. Lilly, S.J., Tresse, L., Hammer, F., Crampton, D. and Le Fevre, O. (1995). ApJ, 455, 108.ADSCrossRefGoogle Scholar
  41. Linde, A.D. (1974). Pisma Zh. Eksp. Teor. Fiz, 5, 32.Google Scholar
  42. Longair, M.S. (1997). In Critical Dialogues in Cosmology, (ed. N. Turok), 285. Singapore: World Scientific.Google Scholar
  43. Longair, M.S. (1997). High Energy Astrophysics. Vols. 1 & 2 (corrected 2nd edi-tions). Cambridge: Cambridge University Press.Google Scholar
  44. Lynden-Bell, D. (ed.) (1994). Cosmical Magnetism. Dordrecht: Kluwer Academic Publishers.CrossRefGoogle Scholar
  45. Ostriker, J.P. and Hausman, M.A. (1977). ApJL, 217, 125.CrossRefGoogle Scholar
  46. Ostriker, J.P. and Peebles, P.J.E. (1973). ApJ, 186, 467.ADSCrossRefGoogle Scholar
  47. Pascarelle, S.M., Windhorst, R.A., Keel, W.C. and Odewahn, S.C. (1996). Nature, 383, 45.ADSCrossRefGoogle Scholar
  48. Parker, E.N. (1997). In Critical Dialogues in Cosmology, (ed. N. Turok), 309. Sin-gapore: World Scientific.Google Scholar
  49. Peebles, P.J.E. (1993). Principles of Physical Cosmology. Princeton: Princeton Uni-versity Press.Google Scholar
  50. Rees, M.J. (1994). In Cosmical Magnetism, (ed. D. Lynden-Bell), 155. Dordrecht: Kluwer Academic Publishers.Google Scholar
  51. Rees, M.J. (1995). Perspectives in Astrophysical Cosmology. Cambridge: Cambridge University Press.Google Scholar
  52. Sakharov, A.D. (1967). JETP Letters, 5, 24.ADSGoogle Scholar
  53. Schade, D. (1997). In The Hubble Space Telescope and the High Redshift Universe, (eds. N.R. Tanvir, A. Aragon-Salamanca and J.V. Wall), 199. Singapore: World Scientific Publishing Co.Google Scholar
  54. Spinrad, H., Dey, A. and Graham, J.R. (1995). ApJ, 438, L51.ADSCrossRefGoogle Scholar
  55. Strömgren, B. (1934). ApJ, 79, 460.ADSCrossRefGoogle Scholar
  56. Tayler, R.J. (1994). The Stars: their Structure and Evolution. Cambridge: Cam¬bridge University Press.CrossRefGoogle Scholar
  57. Taylor, J. and Cordes, J.M. (1993). ApJ, 411, 674.ADSCrossRefGoogle Scholar
  58. Thorne, K.S., Price, R.H. and Macdonald, D.A. (1986). Black Holes: the Membrane Paradigm. New Haven: Yale University Press.Google Scholar
  59. Tinsley, B.M. and Gunn, J.E. (1976). ApJ, 206, 525.ADSCrossRefGoogle Scholar
  60. Vallee, J.P. (1997). Fund. Cosm. Phys., 19, 1.ADSGoogle Scholar
  61. Weinberg, S. (1997). In Critical Dialogues in Cosmology, (ed. N. Turok), 195. Singapore: World Scientific.Google Scholar
  62. von Weizsacher, C.F. (1947). Zeit. Ap, 24, 181.Google Scholar
  63. Wheeler, J.A. (1977). In Foundational Problems in the Special Science, (eds. R.E. Butts and J. Hintikka), 3. Dordrecht: D. Reidel Publishing Co.Google Scholar
  64. White, S.D.M. and Rees, M.J. (1978). MNRAS, 183, 341.ADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • Malcolm S. Longair
    • 1
  1. 1.Department of Physics, Cavendish LaboratoryUniversity of CambridgeCambridgeUK

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