On the Quantum Origin of a Dark Universe

Abstract

It has been shown beyond reasonable doubt that the majority (about 95%) of the total energy budget of the universe is given by the dark components, namely Dark Matter and Dark Energy. What constitutes these components remains to be satisfactorily understood however, despite a number of promising candidates. An associated conundrum is that of the coincidence, i.e. the question as to why the Dark Matter and Dark Energy densities are of the same order of magnitude at the present epoch, after evolving over the entire expansion history of the universe. In an attempt to address these, we consider a quantum potential resulting from a quantum corrected Raychaudhuri/Friedmann equation in presence of a cosmic fluid, which is presumed to be a Bose-Einstein condensate (BEC) of ultralight bosons. For a suitable and physically motivated macroscopic ground state wavefunction of the BEC, we show that a unified picture of the cosmic dark sector can indeed emerge, thus resolving the issue of the coincidence. The effective Dark energy component turns out to be a cosmological constant, by virtue of a residual homogeneous term in the quantum potential. Furthermore, comparison with the observational data gives an estimate of the mass of the constituent bosons in the BEC, which is well within the bounds predicted from other considerations.

Alena Tensor and Its Possible Applications in Unification Theories

“…The first topic discussed will be the issue of the dark sector, for which Alena Tensor brings new interpretation possibilities. Although Dark Energy and Dark Matter are concepts closely related to the General Relativity, their analysis is also carried out e.g., from the perspective of quantum theories and quantum cosmology [24][25][26].…”

Alena Tensor and Its Possible Applications in Unification Theories

“…Although Dark Energy and Dark Matter are concepts closely related to the General Relativity, their analysis is also carried out e.g. from the perspective of quantum theories and quantum cosmology [32][33][34].…”

Alena Tensor as an Example of the Dualistic Approach and Its Possible Applications in Quantum Field Theory and Unification Theories

“…Neglecting other forces (as we currently do in known solutions for GR), one actually approximately obtains metric tensors responsible for gravity alone. However, the inclusion of other interactions in the Alen Tensor causes the Einstein tensor to correspond to the curvature associated with the four-force density from Equation (19). This means that the above approach can be used to search for the causes of disturbances between observations and the expected motion resulting from gravitational equations, which is currently attributed entirely to Dark Matter [12].…”

“…The first topic discussed will be the issue of the dark sector, which seems to be the easiest to analyze. Although Dark Energy and Dark Matter are concepts closely related to the General Relativity, their analysis is also carried out from the perspective of quantum theories and quantum cosmology [18][19][20].…”