Tootfinder

Scalar Field Reconstructions of Holographic Dark Energy Models with Applications to Chaplygin Gas, DBI, Yang-Mills, and NLED Frameworks
Antonio Pasqua
https://arxiv.org/abs/2509.08029

Scalar Field Reconstructions of Holographic Dark Energy Models with Applications to Chaplygin Gas, DBI, Yang-Mills, and NLED Frameworks
In this study, we investigate the cosmological implications of two DE models, introduced by Chen \& Jing \cite{modelhigher} and by Granda \& Oliveros \cite{gohnde}. The first model comprises three principal components: one term proportional to the Hubble parameter $ H$ squared, and two additional terms proportional to the first and second time derivatives of $ H $, respectively. The second model, known as New Holographic Dark Energy (NHDE) model, can be considered a generalization of the Ricci …

Hop, Skip, and Overthink: Diagnosing Why Reasoning Models Fumble during Multi-Hop Analysis
Anushka Yadav, Isha Nalawade, Srujana Pillarichety, Yashwanth Babu, Reshmi Ghosh, Samyadeep Basu, Wenlong Zhao, Ali Nasaeh, Sriram Balasubramanian, Soundararajan Srinivasan
https://arxiv.org/abs/2508.04699

Hop, Skip, and Overthink: Diagnosing Why Reasoning Models Fumble during Multi-Hop Analysis
The emergence of reasoning models and their integration into practical AI chat bots has led to breakthroughs in solving advanced math, deep search, and extractive question answering problems that requires a complex and multi-step thought process. Yet, a complete understanding of why these models hallucinate more than general purpose language models is missing. In this investigative study, we systematicallyexplore reasoning failures of contemporary language models on multi-hop question answering…

Tonalli: a 3D Magnetohydrodynamic Model, simplified Multi-species using Non-Local Thermodynamic Equilibrium Approximation for the Solar Chromosphere
Elizandro Huipe-Domratcheva, Victor De la Luz, Luis A. Zapata, Juan Jose Gonzalez-Aviles, Arian Ojeda-Gonzalez
https://arxiv.org/abs/2509.22842

Tonalli: a 3D Magnetohydrodynamic Model, simplified Multi-species using Non-Local Thermodynamic Equilibrium Approximation for the Solar Chromosphere
In this work, we present the development of the Tonalli code: a simplified multi-species (HI, HII, H-, and e) magnetohydrodynamics (MHD) model in Non-local Thermodynamic Equilibrium (NLTE) focused on solar chromospheric conditions. This new model integrates two well established models, Newtonian CAFE (MHD) and PakalMPI (NLTE), through a self-convergence system that links the state equations used by both codes to calculate density, pressure and temperature, with the mean molecular weight ($μ$) …

#Hiroshima-ilta is next August 6 in #Helsinki (Töölönlahti) at 21:00. It will be 80 years since the nuclear attacks on Japan.

80 vuotta siitä kun ydinasetta käytettiin - 6.8 Hiroshima-ilta tilaisuuksia eri puolilla Suomea  - Rauhanliitto
Keskiviikkona  6.8. 2025  vietetään Hiroshiman ja Nagasakin atomipommien uhrien muistopäivää. Nyt  kun tulee 80 vuotta siitä kun Hiroshimaan ja pari päivää myöhemmin Nagasakin pudotettiin atomipommi ja muistamme uhreja niin muistutamme maailman päättäjiä mitä ajankohtaisemmasta aiheesta , siitä isosta vaarasta ihmiskunnalle joita  ydinaseet, niiden modernisointi ja niillä uhkaaminen aiheuttaa

SEDONA-GesaRaT: an AI-Accelerated Radiative Transfer Program for 3-D Supernova Simulations
Xingzhuo Chen, Ulisses Braga-Neto, Lifan Wang, Daniel Kasen, Zhengwei Liu, F. K. Roepke, Ming Zhong, David J. Jeffery
https://arxiv.org/abs/2507.11767

SEDONA-GesaRaT: an AI-Accelerated Radiative Transfer Program for 3-D Supernova Simulations
We present SEDONA-GesaRaT, a rapid code for supernova radiative transfer simulation developed based on the Monte-Carlo radiative transfer code SEDONA. We use a set of atomic physics neural networks (APNN), an artificial intelligence (AI) solver for the non-local thermodynamic equilibrium (NLTE) atomic physics level population calculation, which is trained and validated on 119 1-D type Ia supernova (SN Ia) radiative transfer simulation results showing great computation speed and accuracy. SEDONA…

Formation and Diagnostic Use of Carbon Lines in Stripped-Envelope Supernovae
Stan Barmentloo, Anders Jerkstrand
https://arxiv.org/abs/2509.19438 https://ar…

Formation and Diagnostic Use of Carbon Lines in Stripped-Envelope Supernovae
Carbon is one of the main end products of nucleosynthesis in massive stars. In this work, we study the emission signatures of carbon in spectra of stripped envelope supernovae (SESNe). A grid of model nebular spectra is created using the NLTE radiative transfer code SUMO, with stellar evolution- and explosion models as inputs. In the models, [C I] λ8727 and [C I] λλ9824, 9850 are identified as the only significant optical carbon lines, with contribution from both the O/C and He/C zones. To o…