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We report the existence of an Unruh like effect, for physical observers(cosmological and comoving observers) in the radiation dominated earlyuniverse, which is possible due to the discovery of a new vacuum state(referred here as the $T-$vacuum). Both the comoving and the cosmologicalobservers, who are crucial in our understanding of cosmology, observe this$T-$vacuum as a particle excited state and are able to detect radiation due toparticle creation. We draw a robust analogy with the Unruh effect, whereby --(i) the physical observers here are closely analogous to the accelerated(Rindler) observers in the flat spacetime, and (ii) the $T-$vacuum plays therole of the Minkowski vacuum state which contains particles when viewed fromthe physical observers frame. Our analogy is further supported by a proof ofwell-defined (hadamard) behavior of the $T-$vacuum in the entire spacetime. Allour analysis of the particle creation process is done here within a twodimensional set up.

Physical observers, $T$-vacuum and Unruh like effect in the radiation dominated early universe