20 research outputs found
Local P Violation Effects and Thermalization in QCD: Views from Quantum Field Theory and Holography
We argue that the local violation of P and CP invariance in heavy ion
collisions and the universal thermal aspects observed in high energy collisions
are in fact two sides of the same coin, and both are related to quantum
anomalies of QCD. We argue that the low energy relations representing the
quantum anomalies of QCD are saturated by coherent low dimensional vacuum
configurations as observed in Monte Carlo lattice studies. The thermal spectrum
and approximate universality of the temperature with no dependence on energy of
colliding particles in this framework is due to the fact that the emission
results from the distortion of these low dimensional vacuum sheets rather than
from the colliding particles themselves. The emergence of the long- range
correlations of P odd domains (a feature which is apparently required for
explanation of the asymmetry observed at RHIC and LHC) is also a result of the
same distortion of the QCD vacuum configurations. We formulate the
corresponding physics using the effective low energy effective Lagrangian. We
also formulate the same physics in terms of the dual holographic picture when
low-dimensional sheets of topological charge embedded in 4d space, as observed
in Monte Carlo simulations, are identified with D2 branes. Finally, we argue
that study of these long range correlations in heavy ion collisions could serve
as a perfect test of a proposal that the observed dark energy in present epoch
is a result of a tiny deviation of the QCD vacuum energy in expanding universe
from its conventional value in Minkowski spacetime.Comment: final version to appear in Nucl.Phys.
Physiological Correlates of Volunteering
We review research on physiological correlates of volunteering, a neglected but promising research field. Some of these correlates seem to be causal factors influencing volunteering. Volunteers tend to have better physical health, both self-reported and expert-assessed, better mental health, and perform better on cognitive tasks. Research thus far has rarely examined neurological, neurochemical, hormonal, and genetic correlates of volunteering to any significant extent, especially controlling for other factors as potential confounds. Evolutionary theory and behavioral genetic research suggest the importance of such physiological factors in humans. Basically, many aspects of social relationships and social activities have effects on health (e.g., Newman and Roberts 2013; Uchino 2004), as the widely used biopsychosocial (BPS) model suggests (Institute of Medicine 2001). Studies of formal volunteering (FV), charitable giving, and altruistic behavior suggest that physiological characteristics are related to volunteering, including specific genes (such as oxytocin receptor [OXTR] genes, Arginine vasopressin receptor [AVPR] genes, dopamine D4 receptor [DRD4] genes, and 5-HTTLPR). We recommend that future research on physiological factors be extended to non-Western populations, focusing specifically on volunteering, and differentiating between different forms and types of volunteering and civic participation
Search for dark matter produced in association with bottom or top quarks in âs = 13 TeV pp collisions with the ATLAS detector
A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fbâ1 of protonâproton collision data recorded by the ATLAS experiment at âs = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements
Black History Month 2022 : Celebrating the contributions of Black nurses to healthcare
In February 2022, the UBC Consortium for Nursing History Inquiry hosted a virtual and curated display, Black History Month 2022 â Celebrating the Contributions of Black nurses to healthcare, presented and co-created by Dr. Lydia Wytenbroek, doctoral student IsmĂĄlia De Sousa, and BSN students Tamasha Hussein, Kelly Nguyen, Ariel Tzu-Han Chiao, Brandon Moeller and Merielle Moffatt. This project included a physical display, a virtual âwalk throughâ of the display and an online flipbook.Applied Science, Faculty ofNursing, School ofUnreviewedFacultyGraduateUndergraduat
Directional Selectivity Is Formed at Multiple Levels by Laterally Offset Inhibition in the Rabbit Retina
Black History Month 2023 : Historical Considerations on Nursing Education Across Canada
The UBC Consortium for Nursing History Inquiry presented the event to celebrate Black nurses throughout February 2023. This event included three presentations from members of UBC School of Nursing (recorded), UNBJ Department of History and Politics (not recorded), and USASK College of Nursing (recorded). Topics included Join a Rockefeller Foundation report written by Ethel Johns (the first director of nursing at UBC) on the status of Black women in the nursing profession in the United States (written in 1925), the entry of Black students to UBC Nursing and UNB School of Nursing, and racism in nursing education and practice in Canada today.Applied Science, Faculty ofNon UBCNursing, School ofUnreviewedFacultyGraduateUndergraduat