Tootfinder

On the origin of short-lived cocoon in 3C84: powered by tidal disruption events ?
Nozomu Kawakatu, Motoki Kino, Keiichi Wada
https://arxiv.org/abs/2506.23317

On the origin of short-lived cocoon in 3C84: powered by tidal disruption events ?
We evaluated the jet power and the density of ambient matter in 3C 84 by using the momentum balance along the jet axis and the transonic condition for the cocoons observed at two different scales (approximately 1 and 6 parsec scales). For the inner cocoon, we precisely determined the ratio of jet power to ambient density $L_{\rm j}/n_{\rm a}$ to be $(0.3-0.7)\times 10^{43}\,{\rm erg}\,{\rm s}^{-1}\,{\rm cm}^3$. Similarly, for the outer cocoon, we found that this value is more than an order of m…

Mass Determination of Supermassive Black Holes Governing Evolution of Radio Emitters
Kimitake Hayasaki, Ryo Yamazaki
https://arxiv.org/abs/2507.23161 https://

Mass Determination of Supermassive Black Holes Governing Evolution of Radio Emitters
Tidal disruption events (TDEs) involving supermassive black holes (SMBHs) often exhibit radio emission, yet its physical origin remains uncertain, especially in non-jetted cases. In this Letter, we formulate a general dynamical framework for a radio-emitting shell driven by disk winds and expanding through a power-law ambient medium under the influence of SMBH gravity. We derive and classify power-law-in-time solutions to the governing equations in the adiabatic regime. In particular, a univers…

A tidal energy turbine has generated for 6 years and this is a record that shows the technology is commercially viable.
https://apnews.com/article/tidal-energy-turbine-marine-meygen-scotland-ffff3a7082205b33b612a1417e1ec6d6

Underwater turbine spinning for 6 years off Scotland's coast is a breakthrough for tidal energy
Submerged in about 40 meters of water off Scotland’s coast, a turbine has been spinning for more than six years to harness the power of ocean tides and generate electricity. The trade association Ocean Energy Europe says keeping such a large turbine operating in the harsh sea environment that long is a record that demonstrates the technology's commercial viability. Tidal energy technologies are still in the early days of their commercial development, but their potential for generating clean e…

Tidal adaptive softening and artificial fragmentation in cosmological simulations
Robert A. Mostoghiu Paun, Darren Croton, Chris Power, Alexander Knebe, Adam J. Ussing, Alan R. Duffy
https://arxiv.org/abs/2507.16930

Tidal adaptive softening and artificial fragmentation in cosmological simulations
Traditional N-body methods introduce localised perturbations in the gravitational forces governing their evolution. These perturbations lead to an artificial fragmentation in the filamentary network of the Large Scale Structure, often referred to as "beads-on-a-string." This issue is particularly apparent in cosmologies with a suppression of the matter power spectrum at small spatial scales, such as warm dark matter models, where the perturbations induced by the N-body discretisation dominate t…

£13.2bn fund to fix draughty homes and install heat pumps and solar panels.
Nothing else that I can see on reduction of energy demand.
And here is the money being wasted:
'£30bn in investment in nuclear power, about half on the Sizewell C reactor'
Small tidal schemes in the Mersey, Severn and other estuaries would give a better, and safer, approach to "always on" energy supply.

Continued Rapid Radio Brightening of the Tidal Disruption Event AT2018hyz
Yvette Cendes, Edo Berger, Paz Beniamini, Ramandeep Gill, Tatsuya Matsumoto, Kate D. Alexander, Michael F. Bietenholz, Aprajita Hajela, Collin T. Christy, Ryan Chornock, Sebastian Gomez, Mark A. Gurwell, Garrett K. Keating, Tanmoy Laskar, Raffaella Margutti, Ramprasad Rao, Natalie Velez, Mark H. Wieringa

Continued Rapid Radio Brightening of the Tidal Disruption Event AT2018hyz
We present ongoing radio observations of the tidal disruption event (TDE) AT2018hyz, which was first detected in the radio at 972 days after disruption, following multiple non-detections from earlier searches. The new observations presented here span approximately 1370-2160 days and 0.88-240 GHz. We find that the light curves continue to rise at all frequencies during this time period, following a power law of about F ~ t^3 (compared to F_nu ~ t^5.7 at 972-1400 days), and reaching a peak lumino…

This https://arxiv.org/abs/2409.06616 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Improving redshift-space power spectra of halo intrinsic alignments from perturbation theory
Intrinsic alignments (IAs) of galaxies/halos observed via galaxy imaging survey, combined with redshift information, offer a novel probe of cosmology as a tracer of the tidal force field of a large-scale structure. In this paper, we present a perturbation theory based model for the redshift-space power spectra of galaxy/halo IAs that can keep the impact of the Finger-of-God damping effect, known as a nonlinear systematics of redshift-space distortions, under control. Focusing particularly on ga…

This https://arxiv.org/abs/2411.07035 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Inferring jet physics from neutron star - black hole mergers with gravitational waves
Neutron star - black hole (NSBH) mergers that undergo tidal disruption may launch jets that could power a gamma-ray burst. We use a population of simulated NSBH systems to measure jet parameters from the gravitational waves emitted by these systems. The conditions during the tidal disruption and merger phase required to power a gamma-ray burst are uncertain. It is likely that the system must achieve some minimum remnant baryonic mass after the merger before a jet can be launched to power a gamm…