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It has been known that the fundamental Lifshitz theory, which is based onfirst principles of thermal quantum field theory, experiences difficulties whencompared with precise measurements of the Casimir force. We analyze thenonconventional fit of response functions of many materials along the imaginaryfrequency axis to the empirical model of "modified" oscillators which wasrecently proposed in the literature. According to our results, this model isunacceptable because at high frequencies it leads to the asymptotic behavior ofresponse functions which is in contradiction with that following from thefundamental physical principles. We calculate the Casimir interaction in theconfigurations of several precise experiments using the Lifshitz theory and theresponse functions to quantized electromagnetic field expressed in terms ofmodified oscillators and demonstrate that the obtained results are excluded bythe measurement data. This invalidates a claim made in the literature that theCasimir-van der Waals forces calculated using these response functions are inremarkable agreement with the experimental values. Possible reasons for adisagreement between experiment and theory are discussed, and the way toimprove the situation is directed.

Comparison of the Lifshitz Theory Using the Nonconventional Fit of Response Functions with Precise Measurements of the Casimir Force