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One of the still viable candidates for the dark matter is the so-calledmirror matter. Its cosmological and astrophysical implications were widelystudied in many aspects, pointing out the importance to go further withresearch and refine the studies. In particular, the Big Bang nucleosynthesisprovides a strong test for every dark matter candidate, since it is wellstudied and involves relatively few free parameters. The necessity of accuratestudies of primordial nucleosynthesis with mirror matter has then emerged. Inorder to fill this lack, I present here the results of accurate numericalsimulations of the primordial production of both ordinary nuclides and nuclidesmade of mirror baryons, in presence of a hidden mirror sector with unbrokenparity symmetry and with gravitational interactions only. These elements arethe building blocks of all the structures forming in the Universe, thereforetheir chemical composition is a key ingredient for astrophysics with mirrordark matter. The production of ordinary nuclides show differences from thestandard model for a ratio of the temperatures between mirror and ordinarysectors x = T'/T > 0.3, and they present an interesting decrease of theabundance of 7Li. For the mirror nuclides, instead, one observes an enhancedproduction of 4He, that becomes the dominant element for x < 0.5, and muchlarger abundances of heavier elements.

Big Bang nucleosynthesis in visible and hidden-mirror sectors