What is the most influential candidate quantum cosmology today? By influential it (a) reproduces known observation, (b) offers speculative ideas in the planck epoch, (c) professionally researched and published in peer-reviewed journals. I suppose the time line should be 2007-2009 The two I am aware of are string theory inspired braneworld and ekpyrotic brane collisions and loop quantum cosmology. Is it true that loop quantum cosmology reproduces known observation, including Friedmann–Robertson–Walker equation, and is string theory inspired quantum cosmologies able to do so? From what I've heard, prior to 2007, quantum cosmology was dominated by string theory but after 2007 it has been dominated by loop quantum cosmology. It is hoped LQC may make predictions on CMB. Can string theory quantum cosmology also make such predictions? While LQC is a symmetry-reduced version of LQG, and makes assumptions like homogeneity and isotropy, the Friedmann–Robertson–Walker equation makes the same assumptions, and is in general agreement with observation. If there is a third please write-in, thanks.