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clwainwright / CosmoTransitions

A package for analyzing finite or zero-temperature cosmological phase transitions driven by single or multiple scalar fields.
MIT License
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How to demtermine a thick-walled bubble or thin-walled bubble #25

Closed phase-tr closed 4 years ago

phase-tr commented 4 years ago

How to use Cosmotransition to qualitatively determine a thick-walled bubble or a thin-walled bubble? For example, when the transition temperature T_n is much smaller than the critical temperature T_c, we will definitely obtain a thick-walled bubble? Is this right? Many thanks

clwainwright commented 4 years ago

The best way to determine if a bubble is thick-walled is to examine the shape of the bubble itself. If the transition from metastable to stable vacua takes up a substantial portion of the bubble's radius, then the bubble is thick-walled. If not, then it's thin-walled. The temperature by itself won't tell you this, although you're right that bubbles tend to be thick-walled when T_n is much less than T_c. A better rule of thumb is to look at the shape of the potential at the nucleation temperature. If the potential barrier is much larger than the potential difference between vacuum states, then you'll likely be in a thin-walled regime.

You should be able to inspect the bubble profile by looking at the profile1D output of cosmoTransition.pathDeformation.fullTunneling. This info will also be returned in cosmoTransitions.transitionFinder.findAllTransitions(). See the doc strings for the exact format.