Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generating New Perfect-fluid Solutions From Known Ones II   The properties of a transformation previously considered for generating new
perfect-fluid solutions from known ones are further investigated. It is assumed
that the four-velocity of the fluid is parallel to the stationary Killing
field, and also that the norm and the twist potential of the stationary Killing
field are functionally related. This case is complementary to the case studied
in our previous paper. The transformation can be applied to generate possibly
new perfect-fluid solutions from known ones only for the case of barotropic
equation of state rho+3p=0 or, alternatively, for the case of a static
spacetime. For static spacetimes our method recovers the Buchdahl
transformation. It is demonstrated, moreover, that Herlt's technique for
constructing stationary perfect-fluid solutions from static ones is, actually,
a special case of the method considered in the present paper.

31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: adap-org