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A change in gravity law in some regimes is predicted in the modified gravitymodels that are actively discussed at present. In this paper, we consider apossibility that the signal recorded by the Geograv resonant gravitational-wavedetector in 1987 during the explosion of SN 1987A was produced by an abruptchange in the metric during the passage of a strong neutrino flux through thedetector. Such an impact on the detector is possible, in particular, inextended scalar-tensor theories in which the local matter density gradientaffects the gravitational force. The first short neutrino pulse emitted at theinitial stage of stellar core collapse before the onset of neutrino opacitycould exert a major influence on the detector by exiting the detector responseat the main resonance frequency. In contrast, the influence of the subsequentbroad pulse (with a duration of several seconds) in the resonant detector isexponentially suppressed, despite the fact that the second pulse carries anorder-of-magnitude more neutrino energy, and it could generate a signal in theLSD neutrino detector. This explains the time delay of 1.4s between the Geogravand LSD signals. The consequences of this effect of modified gravity forLIGO/Virgo observations are discussed.

Possible Explanation of the Geograv Detector Signal during the Explosion of SN 1987A in Modified Gravity Models