Sudhagar Suyamprakasam (NCAC, Warsaw)
Despite decades of research, the existence of asteroid-mass primordial black holes (PBHs) remains almost completely unconstrained and thus could still comprise the totality of dark matter (DM). In this paper, we show that standard searches for continuous gravitational waves -- long-lived, quasi-monochromatic signals -- could detect extreme mass-ratio inspirals of asteroid-mass PBHs in orbit around a stellar-mass companion using future gravitational-wave (GW) data from Einstein Telescope (ET) and the Neutron Star Extreme Matter Observatory (NEMO). We evaluate the robustness of our projected constraints against the eccentricity of the binary, the choice of the mass of the primary object, and the GW frequency range that we analyze. Furthermore, to determine whether there could be ways to detect asteroid-mass PBHs using current GW data, we quantify the impact of changes in current techniques on the sensitivity towards asteroid-mass PBHs. We show that methods that allow for signals with increased and more complicated frequency drifts over time could obtain much more stringent constraints now than those derived from standard techniques, though at slightly larger computational cost, potentially constraining the fraction of DM that certain asteroid-mass PBHs could compose to be less than one with current detectors.
"Prospects for detecting asteroid-mass primordial black holes
in extreme-mass-ratio inspirals with continuous gravitational waves"
by
Andrew Miller 2024; https://arxiv.org/abs/2410.01348
Tanja Kaister (CAMK, Warsaw)
First documented in the 17th century, numerous observers have reported that sometimes, Venus' night side emits a faint green light. As of now, no complete explanation exists for this transient phenomena. I will review the recent publications on this and put it into the context of research on exoplanets.
References of her talk:
Gray et. al. (2014) - The effect of solar flares, coronal mass
ejections, and solar wind streams on Venus’ 5577 Å oxygen green line
Fox (2012) - The ionospheric source of the red and green lines of atomic
oxygen in the Venus nightglow
Slanger et. al (2001) - Discovery of the atomic oxygen green line in the
Venus night airglow
Slanger et. al (2012) - O/O₂ emissions in the Venus nightglow
Slanger et. al (2006) - The Venus nightglow: Ground-based observations
and chemical mechanisms
Pérez-Ivernon et. al (2016) - Mesospheric optical signatures of possible
lightning on Venus
Xu et. al (2023) - Magnetic Topology at Venus: New Insights Into the
Venus Plasma Environment
Gray et. al (2021) - The Need for Ground-Based Observations of Venus
