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arXiv 1007.0991hep-phhep-th
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非微扰重整化群中热标量理论压强的计算

Calculation of the pressure of a hot scalar theory within the Non-Perturbative Renormalization Group

Jean-Paul Blaizot, Andreas Ipp, Nicolás Wschebor

摘要:

本文将最近发展起来的求解非微扰重整化群的方法应用于热标量场理论的压强计算。这种方法产生一个准确的确定的动量依赖的n点函数在整个动量范围内,从低动量,可能是关键的,区域的扰动,高动量区域。因此,它有可能很好地说明所有波长的模式的贡献的标量函数,以及准粒子与多粒子状态的混合的影响。我们比较了用这种方法得到的函数与所谓的局部势近似,我们发现非常小的修正。这一结果表明,在这个系统中的准粒子图片的鲁棒性。它还表明了整体近似方案的稳定性,这可用于在3+1维标量理论中的耦合常数的最大值。这与微扰理论形成鲜明对比,微扰理论没有收敛的迹象,直到最近计算出的最高阶。

英文摘要:

We apply to the calculation of the pressure of a hot scalar field theory a method that has been recently developed to solve the Non-Perturbative Renormalization Group. This method yields an accurate determination of the momentum dependence of n-point functions over the entire momentum range, from the low momentum, possibly critical, region up to the perturbative, high momentum region. It has therefore the potential to account well for the contributions of modes of all wavelengths to the thermodynamical functions, as well as for the effects of the mixing of quasiparticles with multi-particle states. We compare the thermodynamical functions obtained with this method to those of the so-called Local Potential Approximation, and we find extremely small corrections. This result points to the robustness of the quasiparticle picture in this system. It also demonstrates the stability of the overall approximation scheme, and this up to the largest values of the coupling constant that can be used in a scalar theory in 3+1 dimensions. This is in sharp contrast to perturbation theory which shows no sign of convergence, up to the highest orders that have been recently calculated.

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