Complex instantons in sigma models with chemical potential
Complex instantons in sigma models with chemical potential
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西格玛模型中具有化学势的复杂瞬子
DOI:
10.1103/physrevd.98.065005
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发表时间:
2018
影响因子:
5
通讯作者:
S. Lochner
中科院分区:
文献类型:
--
作者:
F. Bruckmann;S. Lochner
We analyze two-dimensional nonlinear sigma models at nonzero chemical potentials, which are governed by a complex action. In the spirit of contour deformations (thimbles), we extend the fields into the complex plane, which allows us to incorporate the chemical potentialsas twisted boundary conditions. We write down the equations of motion and find exact BPS-like solutions in terms of pairs of (anti)holomorphic functions, in particular generalizations of unit charge and fractional instantons to generic. The decay of these solutions is controlled by the imaginary part ofand a vanishing imaginary part causes jumps in the action. We analyze how the total charge is distributed into localized objects and to what extent these are characterized by topology.
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DOI:
--
发表时间:
2014
期刊:
影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
F. Bruckmann
通讯作者:
F. Bruckmann
DOI:
--
发表时间:
2016
期刊:
影响因子:
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作者:
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