Opportunities with ultra-soft photons: Bremsstrahlung from stopping

We compute the spectra of bremsstrahlung photons for different stopping scenarios which give rise to different initial charge-rapidity distributions. In the light of novel experimental opportunities that may arise with a new heavy-ion detector ALICE-3 at the CERN LHC, we discuss how to discriminate between these stopping scenarios and how to disentangle bremsstrahlung photons from other photon sources.Comment: 6 pages, 3 figures, contribution to the proceedings of Quark Matter 202

Efficacy of Platelet-Rich Fibrin on Wound Healing and Pain following Guided Bone Regeneration

Purpose: The purpose of this study was to evaluate the effect of platelet-rich fibrin (PRF) on the soft tissue wound healing and postoperative pain when it is used as an adjunct therapy for guided bone regeneration (GBR) procedures. Materials and Methods: Seven patients were randomly assigned to test group (GBR + PRF; n=5) and control group (GBR only; n=2), and soft tissue healing and pain levels were evaluated. Routine GBR procedures using dPTFE membranes were performed for control group. For the test group, the liquid-form PRF was mixed with bone graft materials and PRF membranes were placed on top of the dPTFE membrane. Following surgery, patients in both groups were given a visual analog scale (100 mm) to use for rating their pain level every night for the next week. Post-operative appointments were scheduled at weeks 1, 2, 4, 6, 8, 12, and 16. During the post-operative appointments, the soft tissue healings were evaluated. The present report follows patients for the first 6 weeks post-GBR surgery. Results: Patients in the test group showed a more rapid decline in self-reported pain, with ratings for the test group being substantially lower than those for the control group. Whereas no membrane exposure was noted for either control patient, exposure was noted for two of the five test patients during follow-up visits. In contrast to membrane exposure, evidence of gingival inflammation was noted in all patients. Similar to the findings for membrane exposure, abnormality in soft tissue consistency was noted for participants in the test group only, mainly in the exposure patients. Conclusion: The present study suggests that addition of PRF to GBR procedures may lower the postoperative pain level. But due to the small sample size, it was difficult to draw a conclusion on the effect of PRF on the membrane exposure and other soft tissue parameters. After additional data are collected by the next investigator, we may be able to draw more definitive conclusions. The next report will also look at the bone quality and quantity in the histologic and radiographic analysis

Medium-modifications of g→ccˉg\to c \bar{c} splitting

We study medium-modifications of the gluon splitting into a quark and anti-quark pair. Applying the Baier-Dokshitzer-Mueller-Peign\'e-Schiff and Zakharov (BDMPS-Z) formalism, we derive a path-integral formula for the in-medium $g\to q \bar{q}$ splitting function in the close-to-eikonal limit. Our analysis shows that there are two qualitatively different medium effects: transverse momentum broadening of $q \bar{q}$ pairs and enhanced production of such pairs. We note that both effects are numerically sizeable if the average momentum transfer from the medium to the parton is at the quark mass scale. In ultra-relativistic heavy-ion collisions, this condition is realized by charm quarks, therefore we focus our numerical analysis on the medium-modifications of $g\to c \bar{c}$ splitting.Comment: 4 pages, 1 figure, contribution to the proceedings of the 20th International Conference on Strangeness in Quark Matter (SQM 2022

Quantum Scalar Corrections to the Gravitational Potentials on de Sitter Background

We employ the graviton self-energy induced by a massless, minimally coupled (MMC) scalar on de Sitter background to compute the quantum corrections to the gravitational potentials of a static point particle with a mass $M$. The Schwinger-Keldysh formalism is used to derive real and causal effective field equations. When evaluated at the one-loop order, the gravitational potentials exhibit a secular decrease in the observed gravitational coupling $G$. This can also be interpreted as a (time dependent) anti-screening of the mass $M$.Comment: 21 pages, uses LaTeX 2