Abstract
Grand Unified Theories (GUTs) provide a possible solution to the long-standing cosmological problem of the apparent asymmetry between matter and antimatter1–9. We have argued recently10 that in a class of GUTs one may relate the baryon asymmetry to certain contributions to the neutron electric dipole moment, dn. In the absence of cancellations due to an unforeseen symmetry, we thereby obtain a qualitative cosmological lower limit on dn. We emphasize here that the experimental upper limit on dn and the present cosmological baryon-to-photon ratio (nB/nγ) can be used to limit the amount of extra entropy generated after baryosynthesis. This restriction on entropy generation becomes quite severe if, as we argue here on the basis of explicit GUTs, dn is actually considerably larger than our previous cosmological lower bound. As an application of our restriction of entropy generation, we establish an upper limit on shear in the early Universe.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Sakharov, A. Zh. eksp. teor. Fiz. 5, 32 (1967); 76, 1172 (1979).
Kuzmin, V. A. Zh. eksp. teor. Fiz. 13, 335 (1970).
Ignatiev, A. Yu., Krasnikov, N. V., Kuzmin, V. A. & Tavkhelidze, A. N. Phys. Lett. 76B, 436 (1978).
Yoshimura, M. Phys. Rev. Lett. 41, 381 (1978); E42, 746 (1979); Phys. Lett. 88B, 294 (1979).
Dimopoulos, S. & Susskind, L. Phys. Rev. D18, 4500 (1978); Phys. Lett. 81B, 416 (1979).
Toussaint, D., Treiman, S. B., Wilczek, F. & Zee, A. Phys. Rev. D19, 1036 (1979).
Ellis, J., Gaillard, M. K. & Nanopoulos, D. V. Phys. Lett. 80B, 360 (1979); E82B, 464 (1979).
Weinberg, S. Phys. Rev. Lett. 42, 850 (1979).
Nanopoulos, D. V. & Weinberg, S. Phys. Rev. D20, 2484 (1979).
Ellis, J., Gaillard, M. K., Nanopoulos, D. V. & Rudaz, S. Phys. Lett. 99B, 101 (1980).
Turner, M. S. & Schramm, D. N. Nature 279, 303 (1979).
Press, W. Phys. Scripta 21, 702 (1980).
Silk, J. The Cosmic Microwave Background Radiation (University of California, Berkeley preprint, 1980).
Peebles, P. J. E. The Large-scale Structure of the Universe (Princeton University Press, New Jersey, 1980).
Fabbri, R., Guidi, I., Melchiori, F. & Natale, V. Phys. Rev. Lett. 44, 1563 (1980).
Boughn, S. P., Cheng, E. S. & Wilkinson, D. T. Astrophys. J. Lett. 243, 113 (1981).
Silk, J. & Wilson, M. L. Astrophys. J. Lett. 244, 37 (1981).
Smoot, G. F., Gorenstein, M. V. & Muller, R. A. Phys. Rev. Lett. 34, 898 (1977).
Barrow, J. D. & Turner, M. S. Nature 291, 469 (1981).
Bond, J. R., Kolb, E. W. & Silk, J. The Generation of Isothermal Perturbations in the Very Early Universe (University of California, Berkeley preprint, 1981).
Guth, A. H. Phys. Rev. D23, 347 (1981).
Bais, F. A. & Rudaz, S. Nucl. Phys. B170, (FS1), 507 (1980).
Ellis, J., Gaillard, M. K. & Nanopoulos, D. V. Phys. Lett. 90B, 253 (1980).
Schramm, D. N. Preprint EFI-81-03 (Enrico Fermi Institute, 1981).
Barrow, J. D. Mon. Not. R. astr. Soc. 175, 359 (1976).
Olson, D. W. & Silk, J. Astrophys. J. 226, 50 (1978).
Altarev, I. S. et al. Preprint 636 (Leningrad Nuclear Physics Institute, 1981).
Witten, E. Nucl. Phys. B177, 477 (1981).
Guth, A. H. & Weinberg, E. J. Phys. Rev. Lett. 45, 1131 (1980).
Ellis, J. & Gaillard, M. K. Nucl. Phys. B150, 141 (1979).
Ellis, J., Gaillard, M. K. & Nanopoulos, D. V. Unification of the Fundamental Particle Interactions (eds Ferrara, S., Ellis, J. & van Nieuwenhuizen, P.) 461 (Plenum, New York, 1980).
Barr, S., Segrè, G. & Weldon, H. A. Phys. Rev. D20, 2494 (1979).
Segrè, G. & Turner, M. S. Phys. Lett. 99B, 399 (1981).
Harvey, J. A., Kolb, E. W., Reiss, D. B. & Wolfram, S. Preprint CALT 68–815 (Caltech, 1981).
Krasnikov, N. V. Yad. Fiz. 28, 549 (1978).
Hung, P. Q. Phys. Rev. Lett. 42, 873 (1979).
Politzer, H. D. & Wolfram, S. Phys. Lett. 82B, 242 (1979); E83B, 421 (1979).
Buras, A. J., Ellis, J., Gaillard, M. K. & Nanopoulos, D. V. Nucl. Phys. B135, 66 (1978).
Nanopoulos, D. V. & Ross, D. A. Nucl. Phys. B157, 273 (1979).
Ignatiev, V. A., Kuzmin, V. A. & Shaposhnikov, M. E. Zh. eksp. teor. Fiz. 30, 726 (1979).
Yildiz, A. & Cox, P. H. Phys. Rev. D21, 906 (1980).
Georgi, H. & Jarlskog, C. Phys. Lett. 86B, 297 (1979).
Georgi, H. & Nanopoulos, D. V. Nucl. Phys. B159, 16 (1979).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ellis, J., Gaillard, M., Nanopoulos, D. et al. Grand unification, the neutron electric dipole moment and galaxy formation. Nature 293, 41–43 (1981). https://doi.org/10.1038/293041a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/293041a0
This article is cited by
-
Deep resonance of CP violation
Nature (1990)
-
Spinor fields in non-abelian Klein-Kaluza theories
International Journal of Theoretical Physics (1984)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.