Cosmological bounce and the cosmological constant problem

We discuss how the modifications of standard Einstein’s equations needed to support cosmological bounce can at same time lead vanishing well known constant problem, while also studying effects spacetime fluctuations. first concentrate on case classical Friedmann–Lemaître–Robertson–Walker (FLRW) and show that in a bouncing cosmology, where modification Einstein–Hilbert action be represented by most general function bounce, problem is absent if this late times approaches sufficiently large value. result does not depend details bounce. Therefore, cosmologies could potentially solve singularity constant. Motivated recent studies context fluctuations metric, we then generalize our study incorporate some problems earlier proposals, like singularities negative values scale factor, are naturally resolved approach proposed here.