Ultralight vector dark matter search using data from the KAGRA O3GK run

Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA has a unique feature due to differing compositions of its mirrors, enhancing the signal of vector DM in the length change in the auxiliary channels. Here we present the result of a search for U(1)B−L gauge boson DM using the KAGRA data from auxiliary length channels during the first joint observation run together with GEO600. By applying our search pipeline, which takes into account the stochastic nature of ultralight DM, upper bounds on the coupling strength between the U(1)B−L gauge boson and ordinary matter are obtained for a range of DM masses. While our constraints are less stringent than those derived from previous experiments, this study demonstrates the applicability of our method to the lower-mass vector DM search, which is made difficult in this measurement by the short observation time compared to the auto-correlation time scale of DM

The Relationship of Varicella and Herpes Zoster: Electron Microscope Studies

The possible relationship or even identity of the viruses of varicella and herpes zoster was first suggested 40 years ago by von Bokay (1909). Since that time papers too numerous for detailed consideration have appeared in support of, or opposition to, the hypothesis of close relationship or identity. Reviews are to be found in papers by Rivers and Eldridge (1929a,b) and by Amies (1934). In general, it may be stated that today most observers believe that many, if not all, cases of herpes zoster are caused by the virus of varicella, and that they in turn can give rise to new cases of variceila. Kundratitz (1925), by the inoculation of clear fluid from vesicles of herpes zoster, obtained typical zoster lesions, localized clear vesicles on a reddish base, in 14 of 28 children who had not had varicella previously. He failed to transmit the disease to 10 who gave previous histories of varicella. Of the 14 children with no history of varicella who did not develop zoster, 3 showed typical varicella. All inoculations were made into light scarifi-cations on the skin. The incubation period was from 9 to 14 days. Successful inoculation of zoster rendered children immune to subsequent inoculation wit