Late-Time Cosmological Phase Transitions

  • David N. Schramm
Part of the Astrophysics and Space Science Library book series (ASSL, volume 169)


It is shown that the potential galaxy formation and large-scale structure problems of (1) objects existing at high redshifts (Z ⋧ 5), (2) structures existing on scales of 100Mpc as well as velocity flows on such scales, and (3) minimal microwave anisotropies \( \frac{{\Delta T}}{T} \lesssim {10^{ - 5}} \) can be solved if the seeds needed to generate structure form in a vacuum phase transition after decoupling. It is argued that the basic physics of such a phase transition is no more exotic than that utilized in the more traditional GUT scale phase transitions, and that, just as in the GUT case, siginificant random gaussian fluctuations and/or topological defects can form. Scale lengths of ∼100Mpc for large-scale structure as well as ∼1Mpc for galaxy formation occur naturally. Possible support for new physics that might be associated with such a late-time transition comes from the preliminary results of the SAGE solar neutrino experiment, implying neutrino flavor mixing with values similar to those required for a late-time transition. It is also noted that a see-saw model for the neutrino masses might also imply a tau neutrino mass that is an ideal hot dark matter candidate. However, in general either hot or cold dark matter can be consistent with a late-time transition.


Dark Matter Cold Dark Matter Topological Defect Galaxy Formation Astrophysical Journal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • David N. Schramm
    • 1
    • 2
  1. 1.The University of ChicagoChicagoUSA
  2. 2.NASA/Fermilab Astrophysics CenterBataviaUSA

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