Expertini Research Research

Browse Research Papers

1,251+ open-access research outputs.

✕ Clear
🔍 philipp koppe
Showing 1251 results for "philipp koppe"
Physics Preprint PDF DOI

Big Dipper, Help Me Find A Way -- Dip-hunting at hadron colliders

Diego A. Baron Moreno, Christoph Englert, Yvonne Peters · 2026

Destructive interference between signal and background processes poses a fundamental challenge in searches for top-philic scalar resonances, significantly reducing experimental sensitivity to well-mot…

Read Paper →
Mathematics Preprint PDF DOI

Asymptotically Z-stable bundles over projective surfaces

Luiz Lara, Henrique N. Sa Earp · 2026

We study the existence of asymptotically $Z$-stable (a.Z stable) bundles over polycyclic surfaces. Our choice of polynomial central charge is related to the existence of solutions of the deformed Herm…

Read Paper →
Mathematics Preprint PDF DOI

Statistical Limit Theorems for Axiom A Diffeomorphisms: Exponential Mixing, Central Limit Theorem, and Large Deviations

Abdoulaye Thiam · 2026

We establish statistical limit theorems for equilibrium states of Axiom A diffeomorphisms, derived from the spectral gap of the Ruelle transfer operator established in Part I (Thiam2026a) and transfer…

Read Paper →
Mathematics Preprint PDF DOI

$C^{\infty}$ regularity of the Alt-Phillips Functional for negative powers

Lu Chen, Jiali Lan, Yong Wu · 2026

In this paper, we study the regularity of the free boundary for minimizers of the Alt-Phillips functional with negative powers \[\mathcal{E}_{\gamma}(u)=\int_{\Omega}\frac{1}{2}|\nabla u|^2+\frac{1}{\…

Read Paper →
Physics Preprint PDF DOI

Discovery of low-redshift analogues to "Little Red Dots" in DESI: A later evolutionary stage of compact LRDs?

Weiyu Ding, Xu Kong, Wei-Jian Guo, Hu Zou, Jialai Wang, Fujia Li, Hongxin Zhang, Jie Song, Jingyi Zhang, Niu Li, Wen-Xiong Li · 2026

The James Webb Space Telescope (JWST) has recently discovered a population of compact, red sources at z > 4 known as "Little Red Dots" (LRDs). They are characterized by their V-shaped continuum spectr…

Read Paper →
Mathematics Preprint PDF DOI

On a Weiss-type Almost Monotonicity Formula

Aelson Sobral · 2026

We establish a Weiss-type almost-monotonicity formula for a broad class of variable-coefficient energy functionals, assuming only minimal regularity of the coefficients. As an application, we classify…

Read Paper →
Physics Preprint PDF DOI

DREAMuS: Dark matter REsearch with Advanced Muon Source

Xiang Chen, Zejia Lu, Liangwen Chen, Jun Gao, Shao-Feng Ge, Zhanxu Hao, Yang Hu, Bingzhi Li, Cen Mo, Zhiyu Sun, Huayang Wang, Chonghao Wu, Yu Xu, Xueheng Zhang, Yulei Zhang, Liang Li · 2026

We propose DREAMuS, a fixed-target experiment at the High Intensity Heavy-Ion Accelerator Facility (HIAF), to search for muon-philic dark matter mediated by light flavor-violating bosons. DREAMuS is d…

Read Paper →
AI & Data Science Preprint PDF DOI

Kuramoto Oscillatory Phase Encoding: Neuro-inspired Synchronization for Improved Learning Efficiency

Mingqing Xiao, Yansen Wang, Dongqi Han, Caihua Shan, Dongsheng Li · 2026

Spatiotemporal neural dynamics and oscillatory synchronization are widely implicated in biological information processing and have been hypothesized to support flexible coordination such as feature bi…

Read Paper →
Economics & Finance Preprint PDF DOI

Identification in (Endogenously) Nonlinear SVARs Is Easier Than You Think

James A. Duffy, Sophocles Mavroeidis · 2026

We study identification in structural vector autoregressions (SVARs) in which the endogenous variables enter nonlinearly on the left-hand side of the model, a feature we term endogenous nonlinearity, …

Read Paper →
Mathematics Preprint PDF DOI

The two-phase Alt-Phillips problem for quasilinear operators

Yousef Alamri, Jose Miguel Urbano · 2026

We establish interior regularity and optimal growth estimates for sign-changing minimizers of the $p-$singular or $p-$degenerate quasilinear Alt--Phillips functional throughout the full range of $1<p<…

Read Paper →
Mathematics Preprint PDF DOI

Verifying Well-Posedness of Linear PDEs using Convex Optimization

Declan S. Jagt, Matthew M. Peet · 2026

Ensuring that a PDE model is well-posed is a necessary precursor to any form of analysis, control, or numerical simulation. Although the Lumer-Phillips theorem provides necessary and sufficient condit…

Read Paper →
Mathematics Preprint PDF DOI

Partial regularity for minimizing constraint maps for the Alt-Phillips energy

Rada Ziganshina · 2026

In this paper, we establish an $\varepsilon$-regularity theorem for minimizers of an Alt-Phillips type functional subject to constraint maps. We prove that under sufficiently small energy, the minimiz…

Read Paper →
Economics & Finance Preprint PDF DOI

The Inflation of Resetting Workers

Rui Sun · 2026

The standard wage Phillips curve aggregates away from which workers reset wages when. I show this aggregation omits a first-order term: the covariance between workers' cost-push exposure and their res…

Read Paper →
Economics & Finance Preprint PDF DOI

An Inflation Model for the Colombian Case. 2001 2025

Wilman Arturo Gomez, Carlos Esteban Posada · 2026

Since the beginning of this century the Colombian monetary authority has conducted monetary policy under a strategy based on setting targets for interest rate and inflation, while allowing the exchang…

Read Paper →
Sociology & Anthropology Preprint PDF DOI

How libraries classified physics preprints before arXiv and set the stage for distinguishing insiders from outsiders

Phillip H. Roth · 2026

In a world with ever-growing scientific literature, meaningful classifications are vital to keep on top of the latest results. In this Comment, historian and sociologist Phillip Roth traces the histor…

Read Paper →
Physics Preprint PDF DOI

Machine Learning-Based Classification of Active Galaxies and Estimation of Supermassive Black Hole Masses

Farideh Mazoochi, Reihaneh Karimi, Mohammad Hossein Zhoolideh Haghighi, Fatemeh Tabatabaei · 2026

Distinguishing active galaxies from star-forming galaxies is essential for understanding galaxy evolution. Diagnostic methods like the BPT (Baldwin, Phillips, and Terlevich) diagram use optical emissi…

Read Paper →
Mathematics Preprint PDF DOI

Letters of a given type in Catalan words: A continued fraction approach

Helmut Prodinger · 2026

Generating functions related to Catalan words and frequencies of digits are obtained using continued fractions. This is fast, elegant, and flexible. It follows the philosophy of Philippe Flajolet from…

Read Paper →
Mathematics Preprint PDF DOI

On the Golomb-Dickman constant under Ewens sampling

Jose Ricardo G. Mendonca, Luis Jehiel Negret · 2026

We define a generalized Golomb-Dickman constant $\lambda_{\theta}$ as the limiting expected proportion of the longest cycle in random permutations under the Ewens measure with parameter $\theta > 0$. …

Read Paper →
Mathematics Preprint PDF DOI

Strong spectral gap for geometrically finite hyperbolic manifolds

Dubi Kelmer, Osama Khalil, Pratyush Sarkar · 2026

Let $\Gamma < G := \operatorname{SO}(d+1, 1)$ for $d \geq 1$ be a Zariski dense, geometrically finite, discrete subgroup with critical exponent strictly greater than $d/2$. We show that $L^2(\Gamma\ba…

Read Paper →
Physics Preprint PDF DOI

An analytical criterion for significant runaway electron generation in activated tokamaks

Bjorn Zaar, Istvan Pusztai, Ida Ekmark, Tunde Fulop · 2026

A disrupting plasma in a high-performance tokamak such as ITER or SPARC may generate large runaway electron currents that, upon impact with the tokamak wall, can cause serious damage to the device. To…

Read Paper →
Page 1 of 63 Next →