Vevacious: a tool for finding the global minima of one-loop effective potentials with many scalars
Vevacious: a tool for finding the global minima of one-loop effective potentials with many scalars
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DOI：
10.1140/epjc/s10052-013-2588-2
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发表时间：
2013-07
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影响因子：
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通讯作者：
J. E. Camargo-Molina;B. O'Leary;W. Porod;F. Staub
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作者：
J. E. Camargo-Molina;B. O'Leary;W. Porod;F. Staub
粒子物理学标准模型的几个扩展包含了额外的标量，这意味着与标准模型相比，标量势更复杂。一般来说，这些电势除了在SU（2）L×U（1）Y正确破缺时所需的最小值外，还允许电荷和/或色破缺的最小值。即使我们假设一个亚稳态的局部极小值被实现，我们也必须确保它的寿命超过我们宇宙的寿命。我们介绍了一个新的程序Vevacious需要一个通用的表达式为一个单圈有效势能函数和findsall的树级极值，然后使用作为起点的梯度为基础的最小化的单圈有效势。如果与输入真空不同，则可以计算从给定输入真空到最深最小值的隧穿时间。参数点以SLHA格式的文件形式给出（尽管不限于超对称模型），新的模型文件可以很容易地由MathematicapackageSARAH自动生成。这段代码使用HOM 4PS 2来找到树级势的所有最小值，PyMin用来跟踪梯度到单循环势的最小值，CosmoTransitions用来计算隧道时间。
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 color-breaking minima besides the desired one with correctly brokenSU(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 calledVevaciouswhich takes a generic expression for a one-loop effective potential energy function and findsallthe tree-level extrema, which are then used as the starting points for gradient-based minimization of the one-loop 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 theSLHAformat (though is not restricted to supersymmetric models), and new model files can be easily generated automatically by theMathematicapackageSARAH. This code usesHOM4PS2to find all the minima of the tree-level potential,PyMinuitto follow gradients to the minima of the one-loop potential, andCosmoTransitionsto calculate tunneling times.