Conveners
Session 3 - Modified Gravity & Dark Energy
- Session convener: Filipe Mena
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Dr Artur Alho (CAMGSD-IST)4/14/25, 2:30 PMTalk
We introduce new simple analytical approximations for quintessence solutions covering both tracking (asymptotically inverse power-law potentials) and thawing slow-roll models. From an observational perspective the remarkable accuracy of the approximations makes numerical calculations superfluous when assessing observational constraints. We will then discuss ongoing work on generalisations for...
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Paulo Alexandre Gomes Monteiro (Center for Astrophysics, University of Porto)4/14/25, 2:45 PMTalk
The wide range of modified gravity theories proposed to address the limitations of General Relativity (GR) presents a challenge in distinguishing between them. In particular, the Geometric Trinity of Gravity - comprising General Relativity, based on curvature; Teleparallel Gravity, which relies on torsion and Symmetric Teleparallel Gravity, which is formulated in terms of nonmetricity- are...
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Anna-Lena Gschrey, Carolina Coelho4/14/25, 3:00 PMTalk
The canonical cosmological model to explain the recent acceleration of the universe relies on a cosmological constant, and most dynamical dark energy and modified gravity model alternatives are based on scalar fields. Still, further alternatives are possible. One of these involves vector fields: under certain conditions, they can lead to accelerating universes while preserving large-scale...
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ANDREA TROST (University of Trieste)4/14/25, 3:15 PMTalk
The elusive cosmological redshift drift — predicted by General Relativity as a direct signature of the universe's accelerated expansion — remains one of the most ambitious goals in observational cosmology. In this study, we take the first steps toward detecting this effect using the Lyman-α forest of bright quasars as tracers of the expanding cosmos. Focusing on the brightest quasar,...
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Ana Mafalda Vieira (Faculdade de Ciências da Universidade de Lisboa)4/14/25, 3:30 PMTalk
There has been recent interest in the cosmological consequences of energy-momentum-powered-gravity models, in which the matter side of Einstein’s equations includes a term proportional to some power, n, of the energy-momentum tensor, in addition to the canonical linear term. Previous works have suggested that these models can lead to a recent accelerating universe without a cosmological...
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Miguel Barroso Varela4/14/25, 3:45 PMTalk
We analyse the late-time cosmological effects of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we will show how to obtain an agreement between different experimental methods without disrupting their individual...
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Dr Robert Monjo (University of Alcalá)4/14/25, 4:00 PMTalk
This work explores the viability of Hyperconical Modified Gravity (HMG) as a relativistic alternative to the Modified Newtonian Dynamics (MOND) in explaining the dynamics of galaxy clusters, radial accelerations and galaxy rotation curves. By using five datasets (including high-resolution X-ray data and weak-lensing observations), we test HMG's predictions for hydrostatic equilibrium in galaxy...
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