"...without resorting to scalar fields" http://arxiv.org/astro-ph/0703566 Co-authored by Parampreet Singh, one of the experts in Quantum Cosmology (gauged by publication trackrecord and citations by other scholars, see: https://www.physicsforums.com/showthread.php?p=1368143#post1368143 ) from page 6 of the paper "Loop Quantum Cosmology...is known to modify the equation of state of ordinary matter, thereby permitting a solution of the horizon problem, without resorting to scalar fields." This is not news, it's been known for quite some time. That's not the point of the paper, which concerns ways to explain the observed structure formation---the statistical features of observed clumping. The comment about the horizon problem not requiring a specially cooked-up "inflaton" field is not the main burden of the article, it is just tossed out as a motivating remark. What the authors are pointing out is that "inflaton" scenarios look different when there is only one main puzzle they are needed for, than when there are several puzzles. If some of the other puzzles are addressed naturally by the cosmological model, without resorting to putting in an exotic field by hand, it makes the scenarios less compelling. And one is then tempted to see if the remaining puzzle of structure formation can also be addressed without assuming an exotic field. This is what the authors try to do, in fact, and they show that it is a tough problem but (i would judge) not entirely hopeless.