Time to move on?

Abstract

Cosmology and particle physics have long been dominated by theoretical paradigms: Einstein's general theory of relativity in cosmology and the Standard Model of particle physics. The time may have come for paradigm shifts. Does cosmological inflation require a modification of Einstein's gravity? Have experiments at the LHC discovered a new particle beyond the Standard Model? It is premature to answer these questions, but we theorists can dream about the possibilities.

Nonthermal production of dark matter from primordial black holes

“…(16) and the disucssion below it). Notably, a concern arises regarding thermal overproduction of gravitinos that decay after BBN [108][109][110]. This can be avoided if the gravitino mass is m 3/2 50 TeV so that gravitinos decay before the onset of BBN.…”

Inflation scenario driven by a low energy physics inflaton

“…After much development, theoretical and experimental, in the physics of the inflationary universe, there are mainly two points that keep challenging people who struggle to make it a robust and, possibly, testable theory at the energy scale probed at the LHC, for example. First, it is not generally easy to reconcile the tiny amplitude of the power spectrum of density perturbations with field theoretical inflationary models without fine-tuning [7] and, secondly, it is not clear how to entertain a natural scenario where inflation might be connected to the low energy physics [8].…”