Dark Energy Models and Cosmological Phenomena
Summary
Dark energy, the mysterious driver of the accelerated cosmic expansion, remains one of the foremost challenges in modern cosmology. Originally encapsulated by the cosmological constant (Λ), alternative scenarios have been proposed to explain observational discrepancies such as the Hubble tension and anomalies in large-scale structure. Dynamical models include quintessence fields, which evolve slowly over cosmic time; phantom energy, characterised by an equation of state w<–1; and early dark energy, which contributes non-negligibly around matter–radiation equality to alleviate the mismatch between local and early-Universe measurements of the Hubble constant. Modified gravity theories offer another perspective by altering the laws of gravitation on large scales. Observational probes such as type Ia supernovae, baryon acoustic oscillations and the cosmic microwave background reveal the imprint of dark energy on the expansion history and the growth of cosmic structure. Complementary methods, including cosmic chronometers and gravitational lensing, refine our understanding of the equation of state and clustering properties. Through the synergy of these approaches, cosmologists aim to distinguish a true cosmological constant from dynamical or exotic alternatives, thereby illuminating the physics underlying the fate of the Universe.
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Dark Energy Models and Cosmological Phenomena publication trend
The graph below shows the total number of articles in dark energy models and cosmological phenomena across all publications each year (not limited to Nature Index journals).
Technical terms
Equation of state (w): Ratio of pressure to energy density in the dark energy component.
Sound horizon: Comoving scale over which acoustic waves propagate in the photon–baryon plasma before recombination.
Baryon acoustic oscillations (BAO): Regular, periodic fluctuations in the density of visible baryonic matter caused by acoustic density waves in the early Universe.
Cosmic microwave background (CMB): Relic radiation from the epoch of recombination, providing a snapshot of the Universe at redshift ≃1100.
Hubble tension: Discrepancy between the expansion rate measured locally and that inferred from the early Universe under ΛCDM.
Moduli stabilisation: Mechanism by which extra-dimensional shape and size parameters in string theory acquire fixed values.
References
- A Consistency Test of the Cosmological Model at the Epoch of Recombination Using DESI Baryonic Acoustic Oscillation and Planck Measurements. The Astrophysical Journal Letters (2024).
- Revisiting the Oldest Stars as Cosmological Probes: New Constraints on the Hubble Constant. The Astrophysical Journal (2023).
- Towards Early Dark Energy in string theory. Journal of High Energy Physics (2023).
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