Subjects: Astronomy >> Astrophysical processes submitted time 2023-02-19
Abstract: $R^2$-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 \textit{surfing solution} and is mostly adiabatic before big bang nucleosynthesis (BBN), even properly including the \textit{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.
Peer Review Status:Awaiting Review
Subjects: Biology >> Microbiology Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2021-08-11
Abstract: By re-analzying public metagemonic data from 101 patients infected with influenza A virus from the 2007-2012 flu seasons in France, we identified artificially constructed recombinant SARS-CoV (SARSr-CoV) sequences in 22 samples, among which three were fully assembled. These sequences are highly similar to the recombinant SARSr-CoV strains generated by the J. Craig Venter Institute in USA, indicating the coexistence of SARS and H1N1 in these patients, which may be caused by possible co-infection or contamination accident. Our analysis also suggests that re-analyzing public metagenomic data is useful for retrospective studies on past outbreaks of infectious diseases. "
Peer Review Status:Awaiting Review
Subjects: Biology >> Virology Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2021-07-28
Abstract: The origin of SARS-CoV-2 remains elusive. Understanding how, when, and where SARS-CoV-2 was transmitted from its natural reservoir to human beings is crucial for preventing future coronavirus outbreaks. With the lessons learned from the endless battle with pathogens and accumulated research data with regard to the origin and intermediate host, we present multiple potential locations as the natural reservoir of SARS-CoV-2.
Peer Review Status:Awaiting Review
Subjects: Biology >> Virology Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics submitted time 2021-07-17
Abstract: "
Peer Review Status:Awaiting Review