Tootfinder

A unified method for generating closed-form point estimators for exponential families: An example with the beta distribution applied to proportions of land used for farming
Roberto Vila, Helton Saulo
https://arxiv.org/abs/2508.12169

A unified method for generating closed-form point estimators for exponential families: An example with the beta distribution applied to proportions of land used for farming
We show that, after a simple power-transform reparameterization of the (vector) exponential family, the solutions to the likelihood equations coincide with moment-type estimating equations. This equivalence enables a unified route to closed-form point estimators for multi-parameter models that typically lack explicit maximum likelihood (ML) solutions. Within this framework we (i) recover, as special cases, several recent closed-form estimators from the literature; (ii) derive new families of es…

Collective ballistic motion explains fast aggregation in adhesive active matter
Emanuel F. Teixeira, Pablo de Castro, Carine P. Beatrici, Heitor C. M. Fernandes, Leonardo G. Brunnet
https://arxiv.org/abs/2508.11793

Collective ballistic motion explains fast aggregation in adhesive active matter
Inspired by motile cells during tissue formation, we identify a mechanism by which active systems of self-aligning adhesive particles undergo ballistic aggregation via a flocking transition. This kinetic regime emerges when the cluster persistence length grows faster with cluster mass than the intercluster distance does. We also characterize and explain the emergence of distinct non-collective kinetic regimes, including long-lived transients relevant to biological systems. Our results provide a…

The Uniform Functional Interpretation with Informative Types
Fernando Ferreira, Paulo Oliva
https://arxiv.org/abs/2508.12781 https://arxiv.org/pdf/2508.127…

The Uniform Functional Interpretation with Informative Types
We discuss a new approach to functional interpretations based on uniform quantification and relativization. The uniform quantification in the background permits a more penetrating analysis of principles related to collection and contra-collection. Relativization comes from a computationally informative notion of being an element of a given type. The approach is flexible. When the information takes the shape of bounds, we can recapture a form of the combination of Gödel's functional dialectica …

How Bad Is Forming Your Own Multidimensional Opinion?
Kiarash Banihashem, MohammadTaghi Hajiaghayi, Mahdi JafariRaviz, Danny Mittal, Alipasha Montaseri
https://arxiv.org/abs/2509.14411

How Bad Is Forming Your Own Multidimensional Opinion?
Understanding the formation of opinions on interconnected topics within social networks is of significant importance. It offers insights into collective behavior and decision-making, with applications in Graph Neural Networks. Existing models propose that individuals form opinions based on a weighted average of their peers' opinions and their own beliefs. This averaging process, viewed as a best-response game, can be seen as an individual minimizing disagreements with peers, defined by a quadra…

The Foldy-Wouthuysen transformation with Dirac matrices in the chiral representation: closed expressions for energy operators of fermions moving in electrostatic fields
V. P. Neznamov
https://arxiv.org/abs/2508.11015

The Foldy-Wouthuysen transformation with Dirac matrices in the chiral representation: closed expressions for energy operators of fermions moving in electrostatic fields
In this paper, we obtain the closed expressions for energy operators in the Foldy-Wouthuysen representation in the presence of electrostatic fields. We also establish the connection between the Foldy-Wouthuysen representation and the Feynman-Gell-Mann representation.

Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster?
Ghasem Safaei, Hosein Haghi, Akram Hasani Zonoozi, Pavel Kroupa
https://arxiv.org/abs/2507.12531

Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster?
Using direct $N$-body simulations, we investigate the initial conditions and evolution of a star-forming region resembling the Orion Nebula Cluster (ONC) with the advanced \textsc{NBODY6} code. By varying the initial conditions, we aim to identify a model that closely aligns with observed parameters such as the half-mass radius, core radius, and total mass. Additionally, we examine the cluster's evolution over 800 Myr to determine whether it could reproduce the present-day properties of the Ple…

Crosslisted article(s) found for physics.bio-ph. https://arxiv.org/list/physics.bio-ph/new
[1/1]:
- Collective ballistic motion explains fast aggregation in adhesive active matter
Teixeira, de Castro, Beatrici, Fernandes, Brunnet

Generalizing Behavior via Inverse Reinforcement Learning with Closed-Form Reward Centroids
Filippo Lazzati, Alberto Maria Metelli
https://arxiv.org/abs/2509.12010 https://

Generalizing Behavior via Inverse Reinforcement Learning with Closed-Form Reward Centroids
We study the problem of generalizing an expert agent's behavior, provided through demonstrations, to new environments and/or additional constraints. Inverse Reinforcement Learning (IRL) offers a promising solution by seeking to recover the expert's underlying reward function, which, if used for planning in the new settings, would reproduce the desired behavior. However, IRL is inherently ill-posed: multiple reward functions, forming the so-called feasible set, can explain the same observed beha…

The emergence of globular clusters and globular-cluster-like dwarfs: #cosmological simulations in which both dark-matter-free GCs and dark-matter-rich dwarf galaxies naturally emerge in the Standard Cosmology. We show that these objects inhabit distinct locations in the size–luminosity plane and that they have similar ages, age spread, metallicity and metallicity spread to globulars and dwarfs in the nearby Universe. About half of our simulated globulars form by means of regular star formation near the centres of their host dwarf, with the rest forming further out, triggered by mergers. The latter are more tidally isolated and more likely to survive to the present day. Finally, our simulations predict the existence of a new class of object that we call ‘globular-cluster-like dwarfs’ (GCDs)."

Euclid: Early Release Observations -- The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC 6822
J. M. Howell, A. M. N. Ferguson, S. S. Larsen, A. Lan\c{c}on, F. Annibali, J. -C. Cuillandre, L. K. Hunt, D. Mart\'inez-Delgado, D. Massari, T. Saifollahi, K. Voggel, B. Altieri, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, G. Ca\~nas-Herrera, G. P. Candini, V. Capobianco, C. Carbone, …

Euclid: Early Release Observations -- The star cluster systems of the Local Group dwarf galaxies IC 10 and NGC 6822
Star clusters are valuable indicators of galaxy evolution, offering insights into the buildup of stellar populations across cosmic time. Understanding intrinsic star cluster populations of dwarf galaxies is particularly important given their role in the hierarchical growth of larger systems. Using Euclid Early Release Observation data, we study star clusters in two star-forming dwarf irregulars in the Local Group, NGC 6822 and IC 10 [$M_\star \sim$ (1--4) $\times10^8 M_\odot$]. With Euclid, clu…