Model-Independent Cosmography with Logarithmic Polynomial using Recent Observational Data

Title

Model-Independent Cosmography with Logarithmic Polynomial using Recent Observational Data

Creator

Kavya, N.S.; Mishra, Sai Swagat; Sahoo, Pradyumn Kumar

Description

The accelerated expansion of the Universe remains a fundamental challenge in cosmology, motivating model-independent methods to reconstruct its expansion history without relying on specific dark energy models. Cosmography, which employs series expansions of cosmological observables around the present epoch, provides a powerful kinematic framework rooted in the cosmological principle. However, standard Taylor expansions suffer from limited convergence at high redshift, prompting the exploration of alternative expansions. In this work, logarithmic polynomial cosmography is investigated, which expands observables in powers of the logarithm of redshift, thereby enhancing convergence over a broad redshift range while maintaining physical insight. The logarithmic polynomial parameters are constrained using recent datasets, including gravitational-wave standard sirens, DESI DR2, cosmic chronometers, and multiple Type Ia supernova compilations (DES-SN5YR, Union3, Pantheon+SH0ES). The analysis demonstrates the efficacy of the logarithmic approach in accurately modeling the cosmic expansion history, providing an interpretable alternative to traditional cosmographic techniques. 2026 Wiley-VCH GmbH.

Source

Fortschritte der Physik;Volume;74;Issue;2;Article No.;e70078;

Date

01-01-2026

Publisher

John Wiley and Sons Inc

Subject

cosmography; gravitational wave; logarithmic polynomial; supernova

Coverage

Kavya N.S., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Mishra S.S., Department of Mathematics, School of Computer Science and Artificial Intelligence, SR University, Telangana, Warangal, 506371, India, Department of Mathematics, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, Telangana, 500078, India; Sahoo P.K., Department of Mathematics, Birla Institute of Technology and Science, Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Medchal District, Telangana, 500078, India

Rights

All Open Access; Bronze Open Access

Relation

ISSN: 158208;

Format

online

Language

English

Type

Article

Identifier

https://doi.org/10.1002/prop.70078

https://www.scopus.com/pages/publications/105029545873?origin=resultslist