Vevacious: a tool for finding the global minima of oneloop effective potentials with many scalars
Abstract
Several extensions of the Standard Model of particle physics contain additional scalars implying a more complex scalar potential compared to that of the Standard Model. In general these potentials allow for charge and/or colorbreaking minima besides the desired one with correctly broken SU(2)_{ L }× U(1)_{ Y }. Even if one assumes that a metastable local minimum is realized, one has to ensure that its lifetime exceeds that of our universe. We introduce a new program called Vevacious which takes a generic expression for a oneloop effective potential energy function and finds all the treelevel extrema, which are then used as the starting points for gradientbased minimization of the oneloop effective potential. The tunneling time from a given input vacuum to the deepest minimum, if different from the input vacuum, can be calculated. The parameter points are given as files in the SLHA format (though is not restricted to supersymmetric models), and new model files can be easily generated automatically by the Mathematica package SARAH. This code uses HOM4PS2 to find all the minima of the treelevel potential, PyMinuit to follow gradients to the minima of the oneloop potential, and CosmoTransitions to calculate tunneling times.
 Publication:

European Physical Journal C
 Pub Date:
 October 2013
 DOI:
 10.1140/epjc/s1005201325882
 arXiv:
 arXiv:1307.1477
 Bibcode:
 2013EPJC...73.2588C
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 44 pages, 1 figure, manual for publicly available software, v2 corresponds to version accepted for publication in EPJC [clearer explanation of scale dependence and region of validity, explicit mention that SLHA files should have blocks matching those expected by model files, updated references]