Speaker
Prof.
Alexey Koshelev
(ShanghaiTech)
Description
In my talk I will focus on renormalizable and ghost-free quantum gravity proposals. An important feature of these models is the presence of infinite derivative operators. Such models on contrary to local gravity modifications can give a blue tilted spectrum of primordial GWs while local models uniquely predict a red tilted primordial GWs spectrum. This is an essential possible observational signature of non-local gravity models. On top of this non-local gravity models can realize stable non-singular cosmological bounce which with necessity results in a blue tilted GW spectrum. Implications for observations and ways to distinguish bounce and inflation will be discussed.
Primary author
Prof.
Alexey Koshelev
(ShanghaiTech)
