English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

One possible way in which phase transitions in the early universe may haveocurred is via nucleation of bubbles of the new phase (true vacuum) in the oldphase (false vacuum). The technique most widely used to compute the probabilityof bubble nucleation is based on instanton methods in the context of thesemiclassical approximation. At zero temperature in (3+1) dimensions thenucleation rate is dominated by the O(4) symmetric instanton, a sphere ofradius $R$, while at temperatures $T >> R^{-1}$, the decay is dominated by a``cylindrical'' (static) instanton wtih O(3) invariance. There has beendiscussion in the literature as to whether the transition between these tworegimens would be first order (discontinuity in the first derivative of thenucleation rate at the transition temperature $T_{c}$), or second order(continuity of the first derivative, but discontinuity of the second derivativeat $T_{c}$). In this paper we obtain the finite temperature solutionscorresponding to the quantum and the thermal regimes, and compute their actionas a function of the temperature for different values of the wall thickness ina $\varphi^{4}$ potential. Our results indicate that only for the cases of verylarge wall thickness a second order transition takes place, while for all theother cases a first order transition occursComment: 13 Figures avalaible by fax on request. Accepted for publication in  Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Bubble nucleation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">cphi</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>models at all temperatures

Bubble nucleation incphi4models at all temperatures