Expertini Research Research

Browse Research Papers

881+ open-access research outputs.

โœ• Clear
๐Ÿ” chiranjeev kumar
Showing 881 results for "chiranjeev kumar"
Mathematics Preprint PDF DOI

Fixed points of orientation-preserving full transformation

Yang An, Wen Ting Zhang, Yi He ยท 2026

Let $\mathcal{OP}_n$ be the monoid of all orientation-preserving full transformations on $X_n=\{1,\dots, n\}$ with the natural order. For $\alpha \in \mathcal{OP}_n$, let $F(\alpha)=\{y\in X_n: y\alphโ€ฆ

Read Paper โ†’
Mathematics Preprint PDF DOI

Positive and negative 3-energies of graphs

Zhengbo Chen, Zhouningxin Wang, Xiao-Dong Zhang ยท 2026

For a simple graph $G$ with $n$ vertices, let $A_G$ denote the adjacency matrix of $G$, and let $\lambda_1(G) \geq \lambda_2(G) \geq \dots \geq \lambda_n(G)$ be its eigenvalues. For an integer $p \geqโ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

Microscopic investigation of $E2$ matrix elements in atomic nuclei -- II

Kouser Qureshie, S. P. Rouoof, J. A. Sheikh, N. Rather, S. Jehangir, G. H. Bhat, S. Frauendorf ยท 2026

The present work is a continuation of our earlier investigation with the primary objective to systematically calculate the $E2$ matrix elements using the microscopic approach of the triaxial projectedโ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

An Unconditional Barrier for Proving Multilinear Algebraic Branching Program Lower Bounds

Deepanshu Kush ยท 2026

Since the breakthrough superpolynomial multilinear formula lower bounds of Raz (Theory of Computing 2006), proving such lower bounds against multilinear algebraic branching programs (mABPs) has been aโ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

A Covariant Phase Space Approach to Einstein-AEther Gravity

Walter Arata, Stefano Liberati, Giulio Neri ยท 2026

Black hole thermodynamics in Lorentz-violating gravity is subtle because different excitations propagate at different speeds and hence identify different causal horizons. We revisit Einstein--AEther gโ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

Near-Optimal Bounds for Parameterized Euclidean k-means

Vincent Cohen-Addad, Karthik C. S., David Saulpic, Chris Schwiegelshohn ยท 2026

The $k$-means problem is a classic objective for modeling clustering in a metric space. Given a set of points in a metric space, the goal is to find $k$ representative points so as to minimize the sumโ€ฆ

Read Paper โ†’
Engineering Preprint PDF DOI

Photogrammetry-Reconstructed 3D Head Meshes for Accessible Individual Head-Related Transfer Functions

Ludovic Pirard, Lorenzo Picinali, Katarina C. Poole ยท 2026

Individual head-related transfer functions (HRTFs) are essential for accurate spatial audio binaural rendering but remain difficult to obtain due to measurement complexity. This study investigates wheโ€ฆ

Read Paper โ†’
Mathematics Preprint PDF DOI

The second moment of derivatives of quadratic twists of modular $L$-functions

Yujiao Jiang, Quanli Shen, Ziyang Tang ยท 2026

We prove an asymptotic formula for the second moment of the first derivative of quadratic twists of modular $L$-functions with three leading order main terms. It improves the previous result of Kumar โ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

When Relaxation Does Not Help: RLDCs with Small Soundness Yield LDCs

Kuan Cheng, Xin Li, Songtao Mao ยท 2026

Locally decodable codes (LDCs) are error correction codes that allow recovery of any single message symbol by probing only a small number of positions from the (possibly corrupted) codeword. Relaxed lโ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

Two NP-hard Extensions of the Spearman Footrule even for a Small Constant Number of Voters

Martin Durand ยท 2026

The Spearman footrule is a voting rule that takes as input voter preferences expressed as rankings. It outputs a ranking that minimizes the sum of the absolute differences between the position of eachโ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

Axially symmetric wormholes

I. A. Sarmiento-Alvarado, Leonel Bixano, Tonatiuh Matos ยท 2026

In this work, we derive an exact vacuum solution to the Einstein field equations that depends on three constant parameters: the throat radius $r_0$, a parameter $q$, which is closely associated with tโ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

One Color Makes All the Difference in the Tractability of Partial Coloring in Semi-Streaming

Avinandan Das ยท 2026

This paper investigates the semi-streaming complexity of \textit{$k$-partial coloring}, a generalization of proper graph coloring. For $k \geq 1$, a $k$-partial coloring requires that each vertex $v$ โ€ฆ

Read Paper โ†’
Mathematics Preprint PDF DOI

Inequalities For The Growth Of Rational Functions With Prescribed Poles

N. A. Rather, Mohmmad Shafi Wani, Danish Rashid Bhat ยท 2026

Let $\mathcal R_{n}$ be the set of all rational functions of the type $r(z) = f(z)/w(z)$, where $f(z)$ is a polynomial of degree at most $n$ and $w(z) = \prod_{j=1}^{n}(z-\beta_j)$, $|\beta_j|>1$ for โ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

A fresh look at boundary terms in Einstein-Hilbert gravity via an initial value variational principle

Songmin Ha, Alexander Rothkopf ยท 2026

A key tenet of general relativity is the dynamical nature of space-time, ideally represented as an initial value problem. Here we explore the variational formulation of classical Einstein-Hilbert gravโ€ฆ

Read Paper โ†’
AI & Data Science Preprint PDF DOI

On the Complexity of Offline Reinforcement Learning with $Q^\star$-Approximation and Partial Coverage

Haolin Liu, Braham Snyder, Chen-Yu Wei ยท 2026

We study offline reinforcement learning under $Q^\star$-approximation and partial coverage, a setting that motivates practical algorithms such as Conservative $Q$-Learning (CQL; Kumar et al., 2020) buโ€ฆ

Read Paper โ†’
Mathematics Preprint PDF DOI

Inequalities involving polynomials and quasimodular forms

Seewoo Lee ยท 2026

In this paper, we study inequalities involving polynomials and quasimodular forms. More precisely, we focus on the monotonicity of the functions of the form $t \mapsto t^m F(it)$ where $F$ is a quasimโ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

Imaging two-body correlations in atomic nuclei via low- and high-energy processes

Stavros Bofos, Benjamin Bally, Thomas Duguet, Mikael Frosini ยท 2026

Characterizing the correlated behavior of nucleons inside atomic nuclei constitutes a long-standing challenge, both experimentally and theoretically. It has recently been understood that two-particle โ€ฆ

Read Paper โ†’
Physics Preprint PDF DOI

Spectral moments of Bures-Hall ensemble and applications to entanglement entropy

Linfeng Wei, Youyi Huang, Lu Wei ยท 2026

We study spectral moments of the Bures-Hall random matrices ensemble. The main result establishes a recurrence relation for the $k$-th spectral moment valid for a real-valued $k$, in contrast to prevaโ€ฆ

Read Paper โ†’
Computer Science Preprint PDF DOI

QEIL v2: Heterogeneous Computing for Edge Intelligence via Roofline-Derived Pareto-Optimal Energy Modeling and Multi-Objective Orchestration

Satyam Kumar, Saurabh Jha ยท 2026

Deploying large language models (LLMs) on heterogeneous edge devices demands frameworks that jointly optimize energy efficiency, inference quality, and reliability. Our prior QEIL v1 (Kumar & Jha, 202โ€ฆ

Read Paper โ†’
Mathematics Preprint PDF DOI

Sharpness of the Osgood Criterion for the Continuity Equation with Divergence-free Vector Fields

Roberto Colombo, Anuj Kumar ยท 2026

For any modulus of continuity $\omega$ that fails the Osgood condition, we construct a divergence-free velocity field $v \in C_t C^\omega_x$ for which the associated ODE admits at least two distinct fโ€ฆ

Read Paper โ†’
Page 1 of 45 Next โ†’