Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shift of Spectral Lines due to Dynamic Multiple Scattering and Screening
  Effect: Implications for Discordant Redshifts   The frequency shift of spectral lines from astronomical objects is most often
explained by the Doppler Effect arising in relative motion and the broadening
of a particular line is supposed to depend on the absolute temperature,
pressure or the different line of sight velocities. The Wolf effect on the
other hand deals with correlation induced spectral changes and explains both
the broadening and shift of the spectral lines. In this framework a sufficient
condition for redshift has been derived and when applicable the shift is shown
to be larger than broadening. Under this condition of larger shift than
broadening we find a critical source frequency below which no spectrum is
analyzable for a particular medium. This gives rise to new type of screening
effect which may play significant role both at laboratory scale as well as in
the astronomical domain. We apply a simple interpretation of the discordant
redshifts in galaxy-quasar associations.

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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat