11,114 research outputs found
Cold asymmetrical fermion superfluids
In this work we investigate the general properties and the ground state of an
asymmetrical dilute gas of cold fermionic atoms, formed by two particle species
having different densities. We have show in a recent paper, that a mixed phase
composed of normal and superfluid components is the energetically favored
ground state of such a cold fermionic system. Here we extend the analysis and
verify that in fact, the mixed phase is the preferred ground state of an
asymmetrical superfluid in various situatiations. We predict that the mixed
phase can serve as a way of detecting superfluidity and estimating the
magnitude of the gap parameter in asymmetrical fermionic systems.Comment: 21 pages, 5 figures, RevTex, typos corrected, introduction improved,
accepted for publication in PR
Decoupling of pion coupling f_{\pi} from quarks at high density in three models, and its possible observational consequences
Chiral symmetry is restored at high density, quarks become nearly massless
and pion, the Goldstone of the symmetry breaking decouples from the quarks.
What happens at high density is important for finding the density dependence of
Strange Quark Matter (SQM), - which in turn is relevant for understanding the
structure of compact stars.Comment: 13 pages, 2 figures. Accepted for publication in PL
National survey of the Portuguese elderly nutritional status : study protocol
Acknowledgements We acknowledge the IAN-AF team (in particular to Duarte Torres, Milton Severo and Andreia Oliveira) for the community sampling and their support on dietary assessment methodology and critical discussion along the elaboration of the present protocol. Funding This project (136SI5) was granted by the Public Health Initiatives Programme (PT06), financed by EEA Grants Financial Mechanism 2009-2014.Peer reviewedPublisher PD
Phase Transition in Asymmetrical Superfluids I: Equal Fermi Surfaces
In this paper, we study phase transitions in asymmetrical fermion
superfluids. In this scenario, the candidates to form pair are particles with
mismatched masses and chemical potentials. We derive an expression for the
critical temperature in terms of the gap and masses (or chemical potentials)
when the constraint of equal Fermi surfaces is imposed.Comment: RevTex, 11 pages, 2 figures, typos corrected and an appendix added,
accepted for publication in Phys. Rev.
Impact of mental disorders on the risk of atrial fibrillation in patients with diabetes mellitus:a nationwide population-based study
BACKGROUND: It is unclear whether mental disorders are an independent risk factor for atrial fibrillation (AF) in patients with diabetes. We aimed to investigate whether patients with diabetes who have mental disorders have an increased risk for AF. METHODS: Using the Korea National Health Insurance Service database, we enrolled 2,512,690 patients diagnosed with diabetes without AF between 2009 and 2012. We assessed five mental disorders: depression, insomnia, anxiety, bipolar disorder, and schizophrenia. Newly diagnosed AF was identified during the follow-up period, and multivariate Cox regression analysis was performed. RESULTS: Among the 2,512,690 patients (mean age 57.2 ± 12.3 years; 60.1% men), 828,929 (33.0%) had mental disorders. Among the five mental disorders, anxiety (68.1%) was the most common, followed by insomnia (40.0%). During a median follow-up duration of 7.1 years, new-onset AF was diagnosed in 79,525 patients (4.66 per 1,000 person-years). Patients with diabetes who had mental disorders showed a higher risk for AF (adjusted hazard ratio [HR] 1.19; 95% confidence interval [CI] 1.17–1.21; p-value < 0.001). Depression, insomnia, and anxiety were significantly associated with higher risk for AF (adjusted HR [95% CI]: 1.15 [1.12–1.17], 1.15 [1.13–1.18], and 1.19 [1.67–1.21], respectively; all p-values < 0.001), whereas bipolar disorder and schizophrenia were not. CONCLUSIONS: Mental disorders, especially depression, insomnia, and anxiety, were associated with an increased risk for AF in patients with diabetes. Greater awareness with a prompt diagnosis of AF should be considered for patients with both DM and mental disorders. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12933-022-01682-7
- …