Finite group actions on genus two SL(2,C)SL(2, \mathbb{C})-character variety and applications to SCFTs

This paper investigates the irreducible components of fixed point sets within the SL(2,C)SL(2, \mathbb{C})-character variety of a genus two surface under finite group actions, utilizing the genus two DAHA to identify geometric transitions that yield novel candidates for symmetry-reduced moduli spaces in 4d N=2\mathcal{N}=2 SCFTs.

Semeon Arthamonov, Anton PribytokTue, 10 Ma🔢 math

Group Entropies and Mirror Duality: A Class of Flexible Mirror Descent Updates for Machine Learning

This paper introduces a comprehensive framework that unifies formal group theory and group entropies to create a flexible, infinite family of Mirror Descent optimization algorithms, featuring a novel "mirror duality" mechanism that adapts to diverse data geometries and statistical distributions while enhancing convergence and regularizer design in machine learning.

Andrzej Cichocki, Piergiulio TempestaTue, 10 Ma🤖 cs.LG

Apparent Phantom Crossing in Gauss-Bonnet Gravity

This paper proposes realistic models within scalar-Einstein-Gauss-Bonnet and ghost-free f(G)f(\mathcal{G}) gravity frameworks that explain recent DESI observations of an inverse phantom crossing in the dark energy equation of state, either through standard phantom crossing mechanisms or via an "apparent" crossing where dark matter density decreases more slowly due to coupling with the Gauss-Bonnet invariant, all while preserving energy conditions.

Shin'ichi Nojiri, Sergei D. Odintsov, V. K OikonomouTue, 10 Ma🔭 astro-ph

Cosmological Perturbation in New General Relativity: Propagating mode from the violation of local Lorentz invariance

This paper establishes a consistent vierbein perturbation framework for New General Relativity to analyze cosmological modes, revealing that Type 3 of the theory possesses five stable propagating modes (tensor, scalar, and vector) that make it particularly suitable for cosmological applications despite its violation of local Lorentz invariance.

Kyosuke Tomonari, Taishi Katsuragawa, Shin'ichi NojiriTue, 10 Ma🔭 astro-ph

Modified Teukolsky formalism: Null testing and numerical benchmarking

This paper validates a modified Teukolsky framework for predicting gravitational-wave ringdown spectra in effective field theories by successfully passing two rigorous null tests and confirming consistency between two independent numerical methods, thereby establishing its reliability for future strong-field tests of General Relativity.

Fawzi Aly, Mahmoud A. Mansour, Luis Lehner, Dejan Stojkovic, Dongjun Li, Pratik WagleTue, 10 Ma⚛️ hep-ph

BPS vortex from nonpolynomial scalar QED in a \mathdsCP1\mathds{C}\mathrm{P}^1-Maxwell theory

This paper investigates a generalized gauged \mathdsCP1\mathds{C}\mathrm{P}^1-Maxwell theory where integrating out a massive Dirac fermion induces a non-polynomial, logarithmic magnetic permeability, enabling the derivation of BPS vortex solutions with quantized magnetic flux that highlight the interplay between target-space geometry and the induced permeability.

F. C. E. LimaTue, 10 Ma⚛️ hep-ph