Probing Cosmic Expansion: The Cosmological Implications of Redshift

Kennedy Konga, Dismas Wamalwa, Dickson Mwenda and Daniel Maitethia
Additional contact information
Kennedy Konga: Department of Physical Sciences, Meru University of Science and Technology, Kenya
Dismas Wamalwa: Department of Physical Sciences, Meru University of Science and Technology, Kenya
Dickson Mwenda: Department of Physical Sciences, Meru University of Science and Technology; Department of Pure and Applied Science, Kirinyaga University, Kenya
Daniel Maitethia: Department of Physical Sciences, Meru University of Science and Technology, Kenya

European Journal of Applied Physics, 2025, vol. 7, issue 2, 32-39

Abstract: Understanding the stretching of light wavelengths, or redshift, is essential for unraveling cosmic expansion and the structure of the universe. This paper investigates three redshift mechanisms: Doppler, cosmological, and relativistic redshift in the context of general relativity. While Doppler redshift applies primarily to nearby objects, cosmological redshift, governed by the expansion of the universe within the Friedmann-Lemaître-RobertsonWalker (FLRW) metric, becomes essential at cosmological distances, supporting the Big Bang model. The work of Edwin Hubble, which linked galaxy recessional velocities to their distances in what is now known as the Hubble-Lemaître law, provided a framework for measuring the expansion rate of the universe. Persistent discrepancies in this rate termed the “Hubble tension,” continue to inspire debate and investigation. Additionally, this paper highlights essential distance measurement methods used in redshift analysis. Technological advancements, including the James Webb Space Telescope (JWST) and the Dark Energy Spectroscopic Instrument (DESI), are enhancing redshift accuracy, fostering new insights into dark matter, dark energy, and galaxy evolution, as well as probing the fundamental questions of the universe.

Keywords: Cosmomological; Redshift; relativistic; telescopes (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://eu-opensci.org/index.php/ejphysics/article/view/11355 Abstract page (text/html)
https://eu-opensci.org/index.php/ejphysics/article/download/11355/2316 Full text (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:epw:physic:v:7:y:2025:i:2:id:11355

DOI: 10.24018/ejphysics.2025.7.2.355

Access Statistics for this article

More articles in European Journal of Applied Physics from European Open Science
Bibliographic data for series maintained by Support Team ().