Optical properties of polymeric materials and their measurement

Ross, G.; Birley, A. W.

doi:10.1088/0022-3727/6/7/203

Cited by 25 publications

(8 citation statements)

References 4 publications

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“…The two sectors T AA and T AZ involve 32 diagrams each, while the T ZZ correlator includes 70 diagrams. The computation of these diagrams is rather involved and has been performed in DR using the on-shell renormalization scheme [23] and the t'Hooft-Veltman prescription for γ 5 matrix. We have used a reduction of tensor integrals to the scalar form and checked explicitly all the Ward and STI's derived in the previous sections.…”

Section: Perturbative Results For All the Correlatorsmentioning

confidence: 99%

Gravity and the neutral currents: Effective interactions from the trace anomaly

2011

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We present a complete study of the one graviton-two neutral gauge bosons vertex at 1-loop level in the electroweak theory. This vertex provides the leading contribution to the interaction between the Standard Model and gravity, mediated by the trace anomaly, at first order in the inverse Planck mass and at second order in the electroweak expansion. At the same time, these corrections are significant for precision studies of models with low scale gravity at the LHC. We show, in analogy with previous results in the QED and QCD cases, that the anomalous interaction between gravity and the gauge current of the Standard Model, due to the trace anomaly, is mediated, in each gauge invariant sector, by effective massless scalar degrees of freedom. We derive the Ward and Slavnov-Taylor identities characterizing the vertex. Our analysis includes the contributions from the improvements of the scalar sector, induced by a conformally coupled Higgs sector in curved space.

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Section: Perturbative Results For All the Correlatorsmentioning

confidence: 99%

Gravity and the neutral currents: Effective interactions from the trace anomaly

2011

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“…Ultraviolet (UV) divergences are treated within dimensional regularization. We use the on-shell renormalization scheme [ 15], following the formulation worked out in Ref. [ 16] for the conventional formalism and in Ref.…”

Section: Numerical Resultsmentioning

confidence: 99%

Radiative corrections to W+W− → W+W− in the electroweak standard model

Denner¹,

Hahn²

1998

Nuclear Physics B

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The cross-section for W + W − → W + W − with arbitrarily polarized W bosons is calculated within the Electroweak Standard Model including the complete virtual and softphotonic O(α) corrections. We show the numerical importance of the radiative corrections for the dominating polarized cross-sections and for the unpolarized cross-section. The numerical accuracy of the equivalence theorem is investigated in O(α) by comparing the cross-section for purely longitudinal W bosons obtained from the equivalence theorem and from the direct calculation. We point out that the instability of the W boson, which is inherent in the one-loop corrections, prevents a consistent calculation of radiative corrections to the scattering of on-real-mass-shell longitudinal W bosons beyond O(α).

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“…The study of the optical absorption spectra is one of the most interesting methods for developing an understanding of the structure and energy gap of polymeric materials [11,12]. The measurements of the optical absorption were carried out to detect the effect of these ratios of embedding the PEG in the PVA.…”

Section: Optical Absorption Spectramentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

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Optical properties of polymeric materials and their measurement

Cited by 25 publications

References 4 publications

Gravity and the neutral currents: Effective interactions from the trace anomaly

Gravity and the neutral currents: Effective interactions from the trace anomaly

Radiative corrections to W+W− → W+W− in the electroweak standard model

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

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