Publications

Citation

BibTex format

@article{Chiang:2026:06/076,
author = {Chiang, H-W and de, Rham C and Garcia-Saenz, S and Zhou, X},
doi = {06/076},
journal = {Journal of Cosmology and Astroparticle Physics},
pages = {076--076},
title = {Cosmological tensions in Proca-Nuevo theory},
url = {http://dx.doi.org/10.1088/1475-7516/2026/06/076},
volume = {2026},
year = {2026}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:title>Abstract</jats:title>                  <jats:p>                    We study the cosmological predictions of (extended) Proca-Nuevo theory. This vector-tensor  theory enjoys stable homogeneous and isotropic solutions characterized by an effective dark energy  fluid, with behavior that ranges from freezing quintessential to thawing phantom-like, serving as  a motivated framework to scrutinize the cosmological tensions that affect the standard  ΛCDM model. While the model we consider is sufficiently generic to encompass a large class  of field theories, it distinguishes itself from scalar dark energy models (quintessential ones,  kinetic ones and non-minimally coupled ones) by the presence of what would be classed as a vector  degree of freedom which can be for instance inherited from more generic theories of gravity.  We  improve on previous work in several directions: we consider a general one-parameter class of  background models; identify a so-called 'special' model and analyze observational constraints  taking also into account perturbations and making use of wide up-to-date catalogs of datasets  including recently released ones. We find that the one-parameter Proca-Nuevo model is preferred  over ΛCDM at 1.5                    <jats:italic>σ</jats:italic>                    when fitting CMB and BAO data, and at 2.4                    <jats:italic>σ</jats:italic>                    when further  adding low-redshift data. The Hubble tension is alleviated, dropping from 5.                    <jats:italic>σ</jats:italic>                    to  2.3                    <jats:italic>σ</jats:italic>                    (resp. 1.5                    <jats:italic>σ</jats:italic>                    ) between CMB with (and resp. without) BAO data and local  measurements. On the other hand, we find that the vector field generically introduces a  s
AU  - Chiang,H-W
AU  - de,Rham C
AU  - Garcia-Saenz,S
AU  - Zhou,X
DO  - 06/076
EP  - 076
PY  - 2026///
SP  - 076
TI  - Cosmological tensions in Proca-Nuevo theory
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2026/06/076
UR  - https://doi.org/10.1088/1475-7516/2026/06/076
VL  - 2026
ER  -
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