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We propose an appealing alternative scenario of leptogenesis assisted by darksector which leads to the baryon asymmetry of the Universe satisfying alltheoretical and experimental constraints. The dark sector carries a non minimalset up of singlet doublet fermionic dark matter extended with copies of a realsinglet scalar field. A small Majorana mass term for the singlet dark fermion,in addition to the typical Dirac term, provides the more favourable dark matterof pseudo-Dirac type, capable of escaping the direct search. Such aconstruction also offers a formidable scope to radiative generation of activeneutrino masses. In the presence of a (non)standard thermal history of theUniverse, we perform the detailed dark matter phenomenology adopting thesuitable benchmark scenarios, consistent with direct detection and neutrinooscillations data. Besides, we have demonstrated that the singlet scalars cango through CP-violating out of equilibrium decay, producing an ample amount oflepton asymmetry. Such an asymmetry then gets converted into the observedbaryon asymmetry of the Universe through the non-perturbative sphaleronprocesses owing to the presence of the alternative cosmological backgroundconsidered here. Unconventional thermal history of the Universe can thus aspireto lend a critical role both in the context of dark matter as well as inrealizing baryogenesis

A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology