6,505 research outputs found
Phase oscillations in superfluid 3He-B weak links
Oscillations in quantum phase about a mean value of , observed across
micropores connecting two \helium baths, are explained in a Ginzburg-Landau
phenomenology. The dynamics arises from the Josephson phase relation,the
interbath continuity equation, and helium boundary conditions. The pores are
shown to act as Josephson tunnel junctions, and the dynamic variables are the
inter bath phase difference and fractional difference in superfluid density at
micropores. The system maps onto a non-rigid, momentum-shortened pendulum, with
inverted-orientation oscillations about a vertical tilt angle , and
other modes are predicted
Remarks on non-gaussian fluctuations of the inflaton and constancy of \zeta outside the horizon
We point out that the non-gaussianity arising from cubic self interactions of
the inflaton field is proportional to \xi N_e where \xi ~ V"' and N_e is the
number of e-foldings from horizon exit till the end of inflation. For scales of
interest N_e = 60, and for models of inflation such as new inflation, natural
inflation and running mass inflation \xi is large compared to the slow roll
parameter \epsilon ~ V'^{2}. Therefore the contribution from self interactions
should not be outrightly ignored while retaining other terms in the
non-gaussianity parameter f_{NL}. But the N_e dependent term seems to imply the
growth of non-gaussianities outside the horizon. Therefore we briefly discuss
the issue of the constancy of correlations of the curvature perturbation \zeta
outside the horizon. We then calculate the 3-point function of the inflaton
fluctuations using the canonical formalism and further obtain the 3-point
function of \zeta_k. We find that the N_e dependent contribution to f_{NL} from
self interactions of the inflaton field is cancelled by contributions from
other terms associated with non-linearities in cosmological perturbation
theory.Comment: 16 pages, Minor changes, matches the published version. v3: Minor
typo correcte
Unpacking qualitative methodology to explore experiences of mothers with children with autism spectrum disorder in the UAE: a thematic analysis inquiry
The current study provides a detailed description of the qualitative research design and methodology, used while exploring challenges and support structures experienced by expat mothers of children with Autism Spectrum Disorder (ASD) in the United Arab Emirates. In-depth, face-to-face, semi-structured interviews were administered with 17 mothers recruited using purposive and snowball sampling. Recurrent and relevant themes were generated using thematic analysis. Given there is a greater need for highlighting methodological rigor in qualitative research, we discuss steps such as a) using field knowledge to create an interview protocol, b) administering collaborative qualitative research, c) having strong eligibility criteria for participants, d) incorporating perspectives of multiple coders in the analytical process, e) being reflective and aware of one’s potential biases, f) enhancing interview protocol based on pilot interviews, g) and focusing on the quality of perspectives or information power instead of quantity of perspectives. Interpretation of findings and recommendation of evidence-informed guidelines incorporates strengths and limitations of the qualitative methodology utilized in the study
Religious factors affecting death anxiety in older adults practicing Hinduism
The aim of the study was to examine the influence of religion on death anxiety in older adults (N = 105) practicing Hinduism and visiting the Kumbh pilgrimage. Standardized questionnaires and brief interviews were administered in participants' native language. Pilgrims with higher religiosity had lower death anxiety compared to pilgrims with lower religiosity. Greater belief in the cycle of rebirth, an increased presence of meaning in life, and less continued search of meaning in life were significantly associated with lower death anxiety. The findings provide support for incorporating religious and spiritual awareness for older adults in community health settings
Uncertainty Quantification-Enabled Inversion of Nuclear Euclidean Responses
Nuclear quantum many-body methods rely on integral transform techniques to
infer properties of electroweak response functions from ground-state
expectation values. Retrieving the energy dependence of these responses is
highly non-trivial, especially for quantum Monte Carlo methods, as it requires
inverting the Laplace transform -- a notoriously ill-posed problem. In this
work, we propose an artificial neural network architecture suitable for
accurate response function reconstruction with precise estimation of the
uncertainty of the inversion. We demonstrate the capabilities of this new
architecture benchmarking it against Maximum Entropy and previously developed
neural network methods designed for a similar task, paying particular attention
to its robustness against increasing noise in the input Euclidean responses.Comment: 11 pages, 7 figure
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