R^(2)-corrected dark energy(DE)models in F(R)gravity have been widely investigated in recent years,which not only removes the weak singularity potentially present in DE models but also provide us with a unified pictur...R^(2)-corrected dark energy(DE)models in F(R)gravity have been widely investigated in recent years,which not only removes the weak singularity potentially present in DE models but also provide us with a unified picture of the cosmic history,including the inflationary and DE epochs.Towards the unified interpretation of dynamical DE all over the cosmic history in the class of R^(2)-corrected DE models,we explore the universal features of the scalaron dynamics in the radiation-dominated epoch,along with the chameleon mechanism,by keeping our eyes on the inflationary and DE epochs.We show that the scalaron evolution does not follow a surfing solution and is mostly adiabatic before big bang nucleosynthesis(BBN),even properly including the kick by the nonperturbative QCD phase transition,hence a catastrophic consequence claimed in the literature is not applied to this class of DE models.This is due to the presence of the gigantic scale hierarchy between R^(2) correction and DE,so is the universal feature for the class of R^(2)-corrected DE models.The prospects for the post-or onset-inflationary epoch would be pretty different from what the standard R^(2) inflationary scenario undergoes due to the presence of the chameleon mechanism.展开更多
基金supported by the National Key R&D Program of China(2021YFA0718500)supported by the National Science Foundation of China(NSFC)(11975108,12047569,12147217)the Seeds Funding of Jilin University。
文摘R^(2)-corrected dark energy(DE)models in F(R)gravity have been widely investigated in recent years,which not only removes the weak singularity potentially present in DE models but also provide us with a unified picture of the cosmic history,including the inflationary and DE epochs.Towards the unified interpretation of dynamical DE all over the cosmic history in the class of R^(2)-corrected DE models,we explore the universal features of the scalaron dynamics in the radiation-dominated epoch,along with the chameleon mechanism,by keeping our eyes on the inflationary and DE epochs.We show that the scalaron evolution does not follow a surfing solution and is mostly adiabatic before big bang nucleosynthesis(BBN),even properly including the kick by the nonperturbative QCD phase transition,hence a catastrophic consequence claimed in the literature is not applied to this class of DE models.This is due to the presence of the gigantic scale hierarchy between R^(2) correction and DE,so is the universal feature for the class of R^(2)-corrected DE models.The prospects for the post-or onset-inflationary epoch would be pretty different from what the standard R^(2) inflationary scenario undergoes due to the presence of the chameleon mechanism.
