Research works

Unified harmonic framework for dark siren cosmology

The galaxy catalog dark siren method aims to infer cosmological parameters from gravitational waves (GWs) without an electromagnetic counterpart by statistically marginalizing over possible host galaxies. The cross-correlation of GW sources and galaxies is a promising avenue for...

Robustness of neural networks for CMB polarization foreground removal

The detection of Cosmic Microwave Background primordial $B$-mode polarization would constitute a ``smoking gun" signal of primordial gravitational waves. However, this measurement requires accurate removal of polarized Galactic foregrounds to avoid systematic biases when estimati...

On the structure of the sandpile identity element on Sierpiński gasket graphs

Abstract We consider the identity of the abelian sandpile group of finite approximation graphs of the Sierpiński gasket, and we show that the second-order term in the scaling limit converges to the path distance to the nearest corner on the Sierpiński gasket. The proof relies on...

Three-dimensional experimental investigation of the interaction between a rising bubble and a vortex ring

The interaction between turbulent flows and bubbles is a complex phenomenon ubiquitous in natural and industrial settings. In this work, we experimentally investigate, from a fundamental perspective, the interaction between a rising bubble and a vortex ring in counterflow. Using...

Finite Element Error Analysis for Elliptic Parameter Identification with Power-Type Nonlinearity

Abstract. This paper studies the numerical analysis of a parameter identification problem governed by elliptic equations with power-type nonlinearity. We propose a numerical reconstruction via a suitable least-squares minimization problem based on piecewise linear finite elements...

A class of unrooted phylogenetic networks inspired by the properties of rooted tree-child networks

A directed phylogenetic network is tree-child if every non-leaf vertex has a child that is not a reticulation. As a class of directed phylogenetic networks, tree-child networks are very useful from a computational perspective. For example, several computationally difficult proble...

Exploring gas thermodynamics around galaxies from the Sunyaev-Zel’dovich effects: Impact of galaxy-halo connection, 2D projection, and velocity field

A complete picture of the gas thermodynamics around galaxies is imprinted on the cosmic microwave background (CMB). Indeed, the thermal, kinematic, and relativistic Sunyaev-Zel'dovich effects (tSZ, kSZ, rSZ) measure the gas density, temperature, pressure of baryonic feedback and...

A variational principle for holomorphic correspondences

In this paper, we consider a dynamical system on the Riemann sphere that evolves through a set-valued map, namely a holomorphic correspondence. Analogous to the investigation of the dynamics effected by a continuous map defined on a compact metric space, wherein the concept of me...

Off-diagonal Rado number for x+y+c=z and x+qy=z

Ramsey-type problems for linear equations began with Schur’s theorem and were systematically generalized by Richard Rado. In the off-diagonal framework for two colors, one considers two different linear equations ( E 1 , E 2 ) and determines the minimum integer N for which any re...

Size-dependent properties of Miura-ori tessellations

We investigate the size-dependent behavior of Miura-ori-based origami tessellations by changing the number of origami unit cells. For large tessellations, the Miura-ori sheet generally exhibits a negative in-plane Poisson's ratio, whereas if the size of the Miura-ori tessellation...

The MISR Research Product Algorithm – producing global, self-consistent, pixel-level aerosol retrievals for the Multi-angle Imaging SpectroRadiometer

Abstract. The MISR Research Aerosol retrieval algorithm (RA) was developed in parallel with the MISR standard operational algorithm (SA), to explore innovative retrieval ideas for possible implementation in the SA, and to provide higher-spatial-resolution results with enhanced se...

Charm and strange meson fragmentation functions

Quark fragmentation functions describe the hadronization process of a quark where any of the final-state hadrons carries a fraction of its initial momentum. We compute these fragmentation functions for a cascade that includes pions, kaons, and the charmed $D$ and $D_s$ mesons, st...

The need for uncertainty: why probabilistic LSTMs are key to improving flood predictions and enabling learned warning rules

Abstract. Deterministic model predictions can struggle to adequately capture extreme events such as floods and droughts, which are of particular relevance in hydrology. This limitation arises because deterministic models collapse the conditional runoff distribution to a single po...

Fluctuations of the inverted magnetic state and how to sense them

Magnons are the low-energy excitations of magnetically ordered materials. While the magnetic moment of a ferromagnet aligns with an applied magnetic field, it has been experimentally shown that the magnetic order can be inverted by injecting spin current into the magnet. This res...

Generation of iterated wreath products constructed from almost simple groups

Abstract Let G 1 G_{1} , G 2 G_{2} , … be a sequence of almost simple groups and construct a sequence ( W i ) (W_{i}) of wreath products via W 1 = G 1 W_{1}=G_{1} and, for each i > 1 i>1 , W i + 1 = G i + 1 wr W i W_{i+1}=G_{i+1}\mathbin{\mathrm{wr}}W_{i} via the regular action o...

Efficient and accurate steering of large language models through attention-guided feature learning

Activation steering, or direct manipulation of internal activations to guide large language model (LLM) responses toward specific semantic concepts, is emerging as a promising avenue for both understanding how semantic concepts are stored within LLMs and advancing LLM capabilitie...

Enhanced quantum parameter estimation based on the Hardy paradox

Statistical paradoxes such as the Hardy paradox and the enhancement of phase estimation via post-selection both draw upon the same non-classical features of quantum statistics described by non-positive quasi-probabilities. In this paper, we introduce a post-selected quantum metro...

Representations with the same degree

Abstract In this short note, we show that every connected semisimple simply-connected algebraic group of rank $$>1$$ > 1 over the complex numbers has infinitely many pairs of irreducible representations which are not related by an automorphism of the algebraic group and which hav...

Platelet-derived microparticles induce CD8+ T cell senescence in chronic kidney disease via the transfer of microRNA-550a-5p

Abstract Infection is a leading cause of mortality in patients with chronic kidney disease (CKD), in which T cell dysfunction is considered a typical feature. Although platelets are active participants in immune response, their role in regulating T cell function in patients with...

VERIDAH: solving enumeration anomaly–aware vertebra labeling across imaging sequences

Abstract Objectives Although the identification of enumeration anomalies has potential clinical implications for chronic back pain and operation planning, the thoracolumbar junction is poorly assessed and rarely described in clinical reports. Additionally, even though multiple de...