712 research outputs found
Quantum Critical Phase and Lifshitz Transition in an Extended Periodic Anderson Model
We study the quantum phase transition in -electron systems as a quantum
Lifshitz transition driven by selective Mott localization in a realistic
extended Anderson lattice model. Using DMFT, we find that a quantum critical
{\it phase} with anomalous scaling separates a heavy Landau-Fermi
liquid from ordered phase(s). Fermi surface reconstruction occurs via the
interplay between, and penetration of the Green function zeros to the poles,
leading to violation of Luttinger's theorem in the selective-Mott phase . We
show how this naturally leads to scale-invariant responses in transport. Our
work is represents a specific (DMFT) realization of the hidden-FL and FL
theories, and holds promise for study of "strange" metal phases in quantum
matter.Comment: 8 pages,5 figure
Need of the hour: pharmacovigilance study of SGLT-2 inhibitors
Background: Diabetes mellitus represents a global pandemic. Various pharmacotherapy and non-pharmacotherapy measures are advocated for its control. The latest in the pharmacotherapy are Sodium Glucose Transporter -2 (SGLT-2) inhibitors, widely used. Many studies suggest adverse effects related to SGLT-2 inhibitors, evidence still not conclusive and few data from India. Hence this study was planned.Methods: Cross-sectional study over a period of 02 months, recorded demographic details and history of various adverse drug reactions reported with the use of SGLT-2 inhibitors.Results: Majority of the study participants were females (58%) and belonged to the age group of 40-70 yrs. Urinary tract infections (UTI) and genital infections was more seen in the users of dapagliflozin, followed by empagliflozin and canagliflozin.Conclusions: SGLT-2 Inhibitors offer a unique therapeutic approach to the management of Diabetes Mellitus. Further evaluation of the safety profile and the risk-benefit analysis is the need of the hour
Orbifold resolutions with general profile
A very general class of resolved versions of the C/Z_N, T^2/Z_N and S^1/Z_2
orbifolds is considered and the free theory of 6D chiral fermions studied on
it. As the orbifold limit is taken, localized 4D chiral massless fermions are
seen to arise at the fixed points. Their number, location and chirality is
found to be independent on the detailed profile of the resolving space and to
agree with the result of hep-th/0409229, in which a particular resolution was
employed. As a consistency check of the resolution procedure, the massive
equation is numerically studied. In particular, for S^1/Z_2, the "resolved"
mass--spectrum and wave functions in the internal space are seen to correctly
reproduce the usual orbifold ones, as the orbifold limit is taken.Comment: 28 pages, 3 figures, typos corrected, references adde
Modulus stabilization of generalized Randall Sundrum model with bulk scalar field
We study the stabilization of inter-brane spacing modulus of generalized
warped brane models with a nonzero brane cosmological constant. Employing
Goldberger-Wise stabilization prescription of brane world models with a bulk
scalar field, we show that the stabilized value of the modulus generally
depends on the value of the brane cosmological constant. Our result further
reveals that the stabilized modulus value corresponding to a vanishingly small
cosmological constant can only resolve the gauge hierarchy problem
simultaneously. This in turn vindicates the original Randall-Sundrum model
where the 3-brane cosmological constant was chosen to be zero.Comment: 12 Pages, 1 figure, Revtex, Version to appear in Euro. Phys. Let
de Sitter branes with a bulk scalar
We propose new braneworld models arising from a scalar field in the bulk. In
these examples, the induced on--brane line element is de Sitter (or anti de
Sitter) and the bulk (five dimensional) Einstein equations can be exactly
solved to obtain warped spacetimes. The solutions thus derived are single and
two-brane models -- one with {\em thin} branes while the other one of the {\em
thick} variety. The field profiles and the potentials are obtained and analysed
for each case. We note that for the {\em thick} brane scenario the field
profile resembles a kink, whereas for one or more {\em thin} branes, it is
finite and bounded in the domain of the extra dimension. We have also addressed
the localisation of gravity and other matter fields on the brane for these
braneworld models.Comment: 18 pages, 5 figures. Substantial changes and new results. To appear
in GR
Scalar Kaluza-Klein modes in a multiply warped braneworld
The Kaluza-Klein (KK) modes of a massive scalar field on a 3-brane embedded
in six dimensional multiply warped spacetime are determined. Due to the
presence of warping along both the extra dimensions the KK mass spectrum splits
into two closely spaced branches which is a distinct feature of this model
compared to the five dimensional Randall-Sundrum model. This new cluster of the
KK mode spectrum is expected to have interesting phenomenological implications
for the upcoming collider experiments. Such a scenario may also be extended for
even larger number of orbifolded extra dimensions.Comment: 10 pages, Revte
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