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Discrete R symmetries always play an important role in low energy SUSY. Thespontaneously broken of such discrete R symmetries, for example, by gauginocondensation, can lead to domain walls, which need to be either inflated awayor collapse to avoid cosmic difficulties. We propose that explicitly R symmetryviolation needed for collapse of domain walls can be the consequence ofmultiple sector SUSY breaking. The consistency constraints for the generationof non-problematic domain walls from gaugino condensation are discussed. Wealso study the emitted gravitational waves related to the collapse of domainwalls. We find that, for SUSY breaking scale of order ${\cal O}(1)$ ${\rm GeV}$in one of the sequestered sector (and also a low reheating temperature of order${\rm MeV}$ if the reheating is not completed when the domain walls collapse),the peak frequency of gravitational waves emitted can lie at nHz. Such a lowSUSY breaking scale can be consistency and natural in multiple sector SUSYbreaking scenario. The GWs signal by NANOGrav could be a signal of suchmultiple sector SUSY breaking scenario and it may also indicate the existencesof light goldstini at ${\rm eV}$ mass scale.

Did the nHZ Gravitational Waves Signatures Observed By NANOGrav Indicate Multiple Sector SUSY Breaking?