The bispectrum is the Fourier transform of a third-order cumulant or correlation function, with the convention specified for the process or field. It measures third-order dependence among frequency triples; the primordial bispectrum is a cosmological random-field application.
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The bispectrum is a specific mathematical tool used in signal processing and statistical analysis to examine the relationships between different frequency components of a signal. It is a type of higher-order spectrum that goes beyond the traditional power spectrum, which only captures information about the power of individual frequency components. Mathematically, the bispectrum is defined as the Fourier transform of the third-order cumulant of a signal.