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We investigate the structure and the tidal deformability of strange stars(SSs) with a mirror-dark-matter (MDM) core for the standard MIT bag model. Wefind that to explain the observations of PSR J0740+6620, PSR J0030+0451 andGW170817 simultaneously, SSs in GW170817 should have a MDM core although it isunnecessary for PSR J0740+6620 and PSR J0030+0451 to contain a MDM core. Ourstudy leads to the result that for the standard MIT bag model, the observationsof compact stars mentioned above confirm the existence of a dark-matter coreinside SSs.

Strange stars with a mirror-dark-matter core confronting with the observations of compact stars