论文标题
PT破裂的大型斜纹模型中的可调式tachyon质量
Tunable tachyon mass in the PT-broken massive Thirring model
论文作者
论文摘要
我们研究了范式二维巨大的斜斜线模型的非热PT对称概括的全相图。采用非扰动功能性重归于组，我们发现该模型具有自发损坏的PT对称性的制度。这个新阶段的特征是相关的假想质量，对应于纪念性激发，显示出指数增长的幅度，用于时间样间隔和tachyonic（Lieb-obobison-bound Breaking，振动性）激发空间样间隔。此外，由于该阶段将自己表现为一个非常规有吸引力的旋转固定点，通常在有限的现实生活中是无法达到的，因此我们发现可以通过模型的显微镜参数来调整所达到的有效重新归一化的质量。我们的结果进一步预测，新阶段对外部仪表场是强大的，与PT不间断部门的著名BKT阶段相反。然后，量规场提供了一种有效而简单的方法，可以通过广泛的值调整重新归一化的假想质量，因此提供了相应激发的幅度生长/振荡速率。
We study the full phase diagram of a non-Hermitian PT-symmetric generalization of the paradigmatic two-dimensional massive Thirring model. Employing the non-perturbative functional renormalization-group, we find that the model hosts a regime where PT symmetry is spontaneously broken. This new phase is characterized by a relevant imaginary mass, corresponding to monstronic excitations displaying exponentially growing amplitudes for time-like intervals and tachyonic (Lieb-Robison-bound breaking, oscillatory) excitations for space-like intervals. Furthermore, since the phase manifests itself as an unconventional attractive spinodal fixed point, which is typically unreachable in finite real-life systems, we find that the effective renormalized mass reached can be tuned through the microscopic parameters of the model. Our results further predict that the new phase is robust to external gauge fields, contrary to the celebrated BKT phase in the PT unbroken sector. The gauge field then provides an effective and easy means to tune the renormalized imaginary mass through a wide range of values, and therefore the amplitude growth/oscillation rate of the corresponding excitations.
