5,562 research outputs found
Constant curvature black holes in Einstein AdS gravity: conserved quantities
We study physical properties of constant curvature black holes (CCBHs) in
Einstein anti-de Sitter (AdS) gravity. These objects, which are locally AdS
throughout the space, are constructed from identifications of global AdS
spacetime, in a similar fashion as Banados-Teitelboim-Zanelli (BTZ) black hole
in three dimensions. We find that, in dimensions equal or greater than four,
CCBHs have zero mass and angular momentum. Only in odd dimensions we are able
to associate a nonvanishing conserved quantity to these solutions, which
corresponds to the vacuum (Casimir) energy of the spacetime.Comment: 20 pages, no figure
Accurate numerical evaluation of systematics in the experiment for electron electric dipole moment measurement in HfF
Hyperfine structure of the ground rotational level of the metastable
electronic state of HfF ion is calculated at presence
of variable external electric and magnetic fields. Calculations are required
for analysis of systematic effects in experiment for electron electric dipole
moment (EDM) search. Different perturbations in molecular spectra important
for EDM spectroscopy are taken into account.Comment: arXiv admin note: text overlap with arXiv:2302.0285
Progress toward the , -odd Faraday effect: Light absorption by atoms briefly interacting with a laser beam
We investigate the process of photon absorption by atoms or molecules shortly
interacting with a laser beam in the dipole approximation. Assuming that the
interaction time is much smaller than the lifetime of the corresponding
excited state, we examine the absorption probability as a function of .
Besides, we incorporate Doppler broadening due to nonzero temperature of the
atoms (molecules). It is demonstrated that in the case of a zero detuning and
without Doppler broadening, the absorption probability is quadratic in .
Once Doppler broadening is taken into account or the laser beam is off from the
resonant frequency, the absorption probability becomes linear in . Our
findings are expected to be important for experimental studies in optical cells
or cavities where atoms or molecules traverse continuous laser beams. The
experimental prospects of searching for the electric dipole moment (EDM) of the
electron are discussed in detail
, -Odd Effects in the LuOHâș Cation
The LuOH+ cation is a promising system to search for manifestations of time reversal and spatial parity violation effects. Such effects in LuOH+ induced by the electron electric dipole moment eEDM and the scalar-pseudoscalar interaction of the nucleus with electrons, characterized by ks constant, in LuOH+ are studied. The enhancement factors, polarization in the external electric field, hyperfine interaction, and rovibrational structure are calculated. The study is required for the experiment preparation and extraction of the eEDM and ks values from experimental data
-odd effects in the LuOH cation
The LuOH cation is a promising system to search for manifestations of
time reversal and spatial parity violation effects. Such effects in LuOH
induced by the electron electric dipole moment EDM and the
scalar-pseudoscalar interaction of the nucleus with electrons, characterized by
constant, in LuOH are studied. The enhancement factors, polarization
in the external electric field, hyperfine interaction, rovibrational structure
are calculated. The study is required for the experiment preparation and
extraction of the eEDM and ks values from experimental data
Prototyping bespoke sensor industrial internet-of-things (IIoT) systems for small and medium enterprises (SMEs)
This paper aims to share our experiences gained from working on multiple industrialâacademic collaborative projects within the Digital Innovation for Growth (DIfG) regional programme. This initiative provided academic expertise to low-resource SMEs. The projects primarily revolved around measuring various process or structural health variables. The subsequent wireless reporting of these results to an online dashboard and generating alert messages when variables exceeded predefined thresholds were central to our work. Due to the diverse nature of our partnersâ requirements, there was no one-size-fits-all solution for the considered use cases. We will delve into our utilization and insights regarding various IoT-related tools and technologies. These include ESP32 WiFi-enabled microcontrollers, WiFi Manager, NTP time service, watchdog timers, Adafruit IO dashboards and the Twilio SMS gateway, as well as LoRa modules and networks such as TNT and Helium. By effectively combining these tools and technologies, we successfully completed prototypes that enabled testing of the devices on-site
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