Tootfinder

Environmental extreme risk modeling via sub-sampling block maxima
Tuoyuan Cheng, Xiao Peng, Achmad Choiruddin, Xiaogang He, Kan Chen
https://arxiv.org/abs/2506.14556

Environmental extreme risk modeling via sub-sampling block maxima
This paper introduces a novel sub-sampling block maxima technique to model and characterize environmental extreme risks. We examine the relationships between block size and block maxima statistics derived from the Gaussian and generalized Pareto distributions. We introduce a weighted least square estimator for extreme value index (EVI) and evaluate its performance using simulated auto-correlated data. We employ the second moment of block maxima for plateau finding in EVI and extremal index (EI)…

Periodic equatorial orbits in a black bounce scenario
Anderson Bragado, Gonzalo J. Olmo
https://arxiv.org/abs/2506.15600 https://arxi…

Periodic equatorial orbits in a black bounce scenario
We study equatorial closed orbits in a popular black bounce model to see if the internal structure of these objects could lead to peculiar observable features. Paralleling the analysis of the Schwarzschild and Kerr metrics, we show that in the black bounce case each orbit can also be associated with a triplet of integers which can then be used to construct a rational number characterizing each periodic orbit. When the black bounce solution represents a traversable wormhole, we show that the pre…

You've got a Freund--Rubin in Me: The Aretakis Instability of Extremal Black Branes
Calvin Y. -R. Chen, \'Aron D. Kov\'acs
https://arxiv.org/abs/2507.12529

You've got a Freund--Rubin in Me: The Aretakis Instability of Extremal Black Branes
We investigate how the Aretakis instability affects non-dilatonic extremal black $p$-branes by focusing on their near-horizon geometry. Crucially, the strength of the instability, \textit{i.e.} the number of transverse derivatives needed to see non-decay/blow-up of fields on the horizon at late null time, is given by the scaling dimensions with respect to the near-horizon $\mathrm{AdS}_{p+2}$-factor. This renders the problem of determining the severity of the Aretakis instability equivalent to …

Still rocking this for my #WristCheck. I actually really like this one.
On the one hand there is a lot going on on that dial bit it remains readable and everything present serves a purpose. No extraneous text* or logos, so while it is busy, it's also clean.
* Ok, ok maybe the tiny "JAPAN MOVT" at the bottom is pointless but it's so small it's almost not r…

#Blakes7 Series B, Episode 10 - Voice from the Past
AVON: [Restrains Blake] Blake.
BLAKE: Renounce!
AVON: Easy, easy!
BLAKE: Renounce!
AVON: [To Cally] Tranquilizer pack!
BLAKE: Renounce! [Cally administers the tranquilizer pack. Blake subsides]

Blakes7Bot | Search
Companion site to the Blakes7Bot Twitter, Mastodon, and Bluesky accounts. Automated lines of Blakes 7 dialog. Includes a script search facility.

Incorporation of model accuracy in gravitational wave Bayesian inference: #BlackHoles: https://www.port.ac.uk/news-events-and-blogs/news/new-breakthrough-could-sharpen-our-view-of-colliding-black-holes - scientists develop a more accurate way to analyse gravitational waves, that could give us a clearer picture of the Universe’s most extreme collisions.

Building Blocks of a User Experience Research Point of View
Patricia Diaz
https://arxiv.org/abs/2506.15332 https://arxiv.org/pdf/2506…

Building Blocks of a User Experience Research Point of View
This paper presents three User Experience Research (UXR) perspectives based on data, evidence and insights - known as Point of View (POV) - showcasing how the strategies and methods of building a POV work in an enterprise setting. The POV are: 1. Smart Visuals: Use AI to extract and translate text from visuals in videos (2019). 2. Assessable Code Editor: Focus on direct AI-feedback to the learner as it is the loop that requires the least effort for the highest impact(2023). 3. Opportunity Lands…

Null infinity as an inverted extremal horizon: Matching an infinite set of conserved quantities for gravitational perturbations
Shreyansh Agrawal, Panagiotis Charalambous, Laura Donnay
https://arxiv.org/abs/2506.15526

Null infinity as an inverted extremal horizon: Matching an infinite set of conserved quantities for gravitational perturbations
Every spacetime that is asymptotically flat near null infinity can be conformally mapped via a spatial inversion onto the geometry around an extremal, non-rotating and non-expanding horizon. We set up a dictionary for this geometric duality, connecting the geometry and physics near null infinity to those near the dual horizon. We then study its physical implications for conserved quantities for extremal black holes, extending previously known results to the case of gravitational perturbations. …

Extracting energy from plunging region of a Kerr-Taub-NUT black hole by magnetic reconnection
Zhengwei Cheng, Songbai Chen, Jiliang Jing
https://arxiv.org/abs/2507.11859

Extracting energy from plunging region of a Kerr-Taub-NUT black hole by magnetic reconnection
We have studied the energy extraction from a Kerr-Taub-NUT black hole via magnetic reconnections occurring in the plunging region. Our results show that the gravitomagnetic charge suppresses the energy extraction process through magnetic reconnection and reduces the corresponding extraction efficiency, which is opposite to those of the black hole spin and the magnetization parameter. Finally, we treat the energy extraction process through magnetic reconnection as a mechanism to revisit the prob…

Exact plane symmetric black bounce with a perfect-fluid exterior obeying a linear equation of state
Hideki Maeda, Cristian Martinez
https://arxiv.org/abs/2506.14872

Exact plane symmetric black bounce with a perfect-fluid exterior obeying a linear equation of state
We investigate an exact two-parameter family of plane symmetric solutions admitting a hypersurface-orthogonal Killing vector in general relativity with a perfect fluid obeying a linear equation of state $p=χρ$ in $n(\ge 4)$ dimensions, obtained by Gamboa in 2012. The Gamboa solution is identical to the topological Schwarzschild-Tangherlini-(anti-)de~Sitter $Λ$-vacuum solution for $χ=-1$ and admits a non-degenerate Killing horizon only for $χ=-1$ and $χ\in[-1/3,0)$. We identify all possibl…