1,718 research outputs found
Interacting fermions in two dimension in simultaneous presence of disorder and magnetic field
We have studied the revival of Hofstadter butterfly due to the competition
between disorder and electronic interaction using mean field approximation of
unrestricted Hartree Fock method at zero temperature for two dimensional square
and honeycomb lattices. Interplay of disorder and electronic correlation to
nullify each other is corroborated by the fact that honeycomb lattice needs
more strength of electronic correlation owing to its less co-ordination number
which enhances the effect of disorder. The extent of revival of the butterfly
is better in square than honeycomb lattice due to higher coordination number.
The effect of disorder and interaction is also investigated to study
entanglement entropy and entanglement spectrum. It has been observed that for
the square lattice, area law of entanglement entropy is violated for
intermediate strength magnetic and magnitude of such departure from area law
depends on disorder and interaction as well. However such departure from area
law is absence for honeycomb lattice. Moreover the entanglement spectrum for
square lattice does have the symmetry of original Hofstadter butterfly and this
symmetry is destroyed in the presence of disorder. The interaction opens up a
gap in the entanglement spectrum as well. For the honeycomb lattice, the
entanglement spectrum forms a continuous band without any symmetry and its
feature is mostly unchanged in the presence of disorder as well as interaction
GLYCATED HEMOGLOBIN LEVELS IN METABOLIC SYNDROME PATIENTS
Objectives: Metabolic syndrome (MetS) is a cluster of several metabolic disorders including hyperglycemia, reduced high-density lipoprotein cholesterol, and raised triglyceride level in serum, hypertension, and abdominal obesity. Glycated hemoglobin (HbA1c) is used as one of the diagnostic criteria for diabetes and diagnostic tool for MetS.
Methods: The present study was conducted at Prasad Institute of Medical Sciences. The study includes 150 patients with MetS as a case and 150 healthy volunteers as a control. MetS was diagnosed according to National Cholesterol Education Program’s Adult Treatment Panel III criteria. HbA1c was assayed in various components of MetS.
Results: It was found that HbA1c was significantly higher in MetS patients when compared to control group.
Conclusion: Our study suggests that HbA1c might be used as a diagnostic criterion for MetS. Therefore, proper glycemic control should be maintained by maintaining HbA1c level <6.5% to prevent from diabetes and MetS
Observational constraints and some toy models in gravity with bulk viscous fluid
The standard formulation of general relativity fails to describe some recent
interests in the universe. It impels us to go beyond the standard formulation
of gravity. The gravity theory is an interesting modified theory of
gravity, where the gravitational interaction is driven by the nonmetricity .
This study aims to examine the cosmological models with the presence of bulk
viscosity effect in the cosmological fluid within the framework of
gravity. We construct three bulk viscous fluid models, i.e. (i) for the first
model, we assuming the Lagrangian as linear dependence on , (ii) for
the second model the Lagrangian as a polynomial functional form, and
(iii) the Lagrangian as a logarithmic dependence on . Furthermore, we
use 57 points of Hubble data and 1048 Pantheon dataset to constraint the model
parameters. Then, we discuss all the energy conditions for each model, which
helps us to test the self-consistency of our models. Finally, we present the
profiles of the equation of state parameters to test the models' present
status.Comment: 13 pages,9 figures. Comments are Welcom
Gravastar in the Framework of Symmetric Teleparallel Gravity
In the current research, we present a novel gravastar model based on the
Mazur-Mottola (2004) method with an isotropic matter distribution in
gravity. The gravastar, a hypothesized substitute for a black hole, is built
using the Mazur-Mottola mechanism. This approach allows us to define gravastar
as having three stages. The first one is an inner region with negative
pressure; the next region is a thin shell that is made up of ultrarelativistic
stiff fluid, we have studied proper length, energy, entropy, and surface energy
density for this region. Apart from that, we have demonstrated the possible
stability of our suggested thin shell gravastar model through the graphical
study of surface redshift. Exterior Schwarzschild geometry describes the outer
region of the gravastar. In the context of gravity, we have discovered
analytical solutions for the interior of gravastars that are free of any kind
of singularity and the event horizon.Comment: Chinese Physics C published versio
Slow-roll inflation in modified gravity
In this article, we explore the concept of cosmological inflation within the
framework of the theory of gravity, where is a general
function of the Torsion scalar and the trace, , of the
energy-momentum tensor. It is assumed that the conditions of slow-roll
inflation are applicable in gravity. To determine different
observables related to inflation, such as the tensor-to-scalar ratio ,
scalar spectral index , spectral index , and tensor spectral
index , the Hubble slow-roll parameters are utilized for a particular
model of . Lastly, an assessment has been carried out to
determine the feasibility of the models by conducting a numerical analysis of
the parameters. The findings indicate that it is feasible to achieve
compatibility with the observational measurements of slow-roll parameters by
utilizing different values of the free parameters.Comment: Chinese Physics C published versio
Seismic stability of reinforced-soil wall by pseudo-dynamic method
Determination of the internal stability of reinforced soil walls under earthquake conditions is an important part of seismic design. The horizontal method of slices is used for determining internal stability or for tieback analysis of the reinforced soil wall. A pseudo-dynamic method is adopted in the present analysis, which considers the effect of phase difference in both the shear and primary waves travelling through the backfill due to seismic excitation. Reinforced soil walls with cohesionless backfill material have been considered in the analysis. Results are presented in graphical and tabular form to show the required tensile force and length of geosynthetic reinforcement to maintain the stability of the reinforced soil wall under seismic conditions. The effects of variation of parameters such as soil friction angle and horizontal and vertical seismic accelerations on the stability of the reinforced soil wall have been studied. With an increase of seismic accelerations in both the horizontal and vertical directions the stability of the reinforced soil wall decreases significantly, and thus greater strength and length of the geosynthetic reinforcement are required to maintain stability of the wall. The seismic vertical acceleration in an upward direction gives higher values of the required geosynthetic tensile strength, and the seismic vertical acceleration in the downward direction yields higher values of the length of geosynthetic reinforcement. Comparisons of the present results with available pseudo-static results are shown, and the limitations of the pseudo-static results are highlighted
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