QCD and strongly coupled gauge theories : challenges and perspectives

We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO’s second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h95%0=3.47×10−25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering

Histological effects of vitamin A deprivation on estrogen-induced development of chick oviduct

Historical examination of the oviduct magnum of vitamin A [68-26-8]-deprived and corresponding vitamin A-repleted control chicks given injections of 17\beta-estradiol benzoate [50-50-0] for 6 consecutive days revealed that, as compared with the control birds, in the vitamin A-deficient chicks the lobes were much smaller and contained considerably less acini per unit area (80.5 \times 103 \mum2); the size of the acini and the height of the epithelium were markedly increased. Clumps of protodifferentiated cells were frequently seen in the epithelium as well as in the subepithelial regions of the deficient oviduct, whereas they were less frequent in the normal controls. Mitosis could not be detected in the vitamin A-deficient magnum, whereas it was frequently encountered in the control birds. The luminal side of the epithelium as well as the secretions of the oviduct into the lumen showed very strong PAS- and alcian blue-pos. reactions in the deficient tissue, whereas these reactions were very faint in the normal controls. It is suggested that in the absence of sufficient supply of retinol, the normal processes of division and differentiation of the primitive epithelial cells of chick oviduct under estrogen stimulation are grossly affected