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Linear Response

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Emergence of Temperature in Examples and Related Nuisances in Field Theory

Part of the book series: SpringerBriefs in Physics ((SpringerBriefs in Physics))

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Abstract

In this chapter we continue our study of the quantum field theoretical description of the behavior of systems responding dynamically to external perturbations. The dynamical response in the linear approximation reflects some universal features which may help us to understand how a temperature emerges.

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Notes

  1. 1.

    The expression in the exponential is also called the influence functional.

  2. 2.

    This assumption does not hold for a material medium containing massive particles.

  3. 3.

    The \(T^{i\mu }\partial _i\bar{u}_{\mu }\) term vanishes.

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Author information

Authors and Affiliations

  1. H.A.S. Wigner Research Centre for Physics, Budapest, Hungary

    Tamás Sándor Biró

  2. Institute of Physics, Roland Eötvös University, Budapest, Hungary

    Antal Jakovác

Authors
  1. Tamás Sándor Biró
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  2. Antal Jakovác
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Corresponding author

Correspondence to Tamás Sándor Biró .

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© 2019 The Author(s), under exclusive licence to Springer Nature Switzerland AG

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Biró, T.S., Jakovác, A. (2019). Linear Response. In: Emergence of Temperature in Examples and Related Nuisances in Field Theory. SpringerBriefs in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-11689-7_4

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