2,144 research outputs found
Homogeneous geodesics of non-unimodular Lorentzian Lie groups and naturally reductive Lorentzian spaces in dimension three
We determine, for all three-dimensional non-unimodular Lie groups equipped
with a Lorentzian metric, the set of homogeneous geodesics through a point.
Together with the results of [C] and [CM2], this leads to the full
classification of three-dimensional Lorentzian g.o. spaces and naturally
reductive spaces
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Composite polymer membranes for laserinduced fluorescence thermometry
We demonstrate a modified version of laser-induced fluorescence thermometry (LIFT) for mapping temperature gradients in the vicinity of small photothermal devices. Our approach is based on temperature sensitive fluorescent membranes fabricated with rhodamine B and polydimethylsiloxane (PDMS). Relevant membrane features for LIFT, such as temperature sensitivity, thermal quenching and photobleaching are presented for a range of 25 °C to 90 °C, and their performance is evaluated upon obtaining the temperature gradients produced in the proximity of optical fiber micro-heaters. Our results show that temperature measurements in regions as small as 750 μm x 650 μm, with a temperature resolution of 1 °C, can be readily obtained
European Spallation Source as a searching tool for an ultralight scalar field
Dark matter (DM) nature is one of the major issues in physics. The search for
a DM candidate has motivated the known proposal of an ultralight scalar field
(ULSF). We explore the possibility to search for this ULSF at the upcoming
European Spallation Source neutrino Super-Beam experiment. We have considered
the recent study case in which there could be an interaction between the ULSF
and active neutrinos. We have found that in this future experimental setup, the
sensitivity is competitive with other neutrino physics experiments. We show the
expected future sensitivity for the main parameter modeling the interaction
between ULSF and neutrinos.Comment: 27 pages, 3 figures. Section added, extended discussion. To appear in
PR
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