Late phase transitions and the spontaneous generation of cosmological density perturbations

Details Late phase transitions and the spontaneous generation of cosmological density perturbations Late phase transitions and the spontaneous generation of cosmological density perturbations

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvl..57.2234w&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 57, Oct. 27, 1986, p. 2234-2236.

Physics

32

Cosmology, Grand Unified Theory, Mass Distribution, Perturbation Theory, Phase Transformations, Space Density, Gravitational Fields, Low Temperature, Photons

Scientific paper

It is demonstrated that low-temperature first-order phase transitions occurring after photon decoupling can generate significant density perturbations. The possibility of an associated inflationary phase is neglected. The nucleation of bubbles of new ordered phase leads to small density perturbations substantially spherical in shape, and the characteristic length scale associated with the perturbations is derived from the bubble nucleation rate. It is noted that gravitational field variations associated with postrecombination phase transitions can result in significant density fluctuations without perturbing the microwave background.

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