The DOI matches its Crossref record; 63 of the 63 references it cites were found in a registry or an index.
Could dark energy be vector-like?
Open accessAbstract
In this paper I explore whether a vector field can be the origin of the present stage of cosmic acceleration. In order to avoid violations of isotropy, the vector has be part of a ‘cosmic triad’, that is, a set of three identical vectors pointing in mutually orthogonal spatial directions. A triad is indeed able to drive a stage of late accelerated expansion in the universe, and there exist tracking attractors that render cosmic evolution insensitive to initial conditions. However, as in most other models, the onset of cosmic acceleration is determined by a parameter that has to be tuned to reproduce current observations. The triad equation of state can be sufficiently close to minus one today, and for tachyonic models it might be even less than that. I briefly analyse linear cosmological perturbation theory in the presence of a triad. It turns out that the existence of non-vanishing spatial vectors invalidates the decomposition theorem, i.e. scalar, vector and tensor perturbations do not decouple from each other. In a simplified case it is possible to analytically study the stability of the triad along the different cosmological attractors. The triad is classically stable during inflation, radiation and matter domination, but it is unstable during (late time) cosmic acceleration. I argue that this instability is not likely to have a significant impact at present.
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“Hence, experimental constraints [1, 2] on the value of wDE restrict the possible values of n.”
InfluentialCosmological consequences of a rolling homogeneous scalar field
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Einstein’s other gravity and the acceleration of the Universe
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Cosmology and fundamental physics with the Euclid satellite
The Euclid Theory Working Group, Amendola, L., Appleby, S., Avgoustidis, A., Bacon, D., Baker, T., Baldi, M., Bartolo, N., Blanchard, A., Bonvin, C., et al. (2018) · Living Reviews in Relativity · doi:10.1007/s41114-017-0010-3 · Cited by 1,009
Cosmology and Fundamental Physics with the Euclid Satellite
The Euclid Theory Working Group, Amendola, L., Appleby, S., Bacon, D., Baker, T., Baldi, M., Bartolo, N., Blanchard, A., Bonvin, C., Borgani, S., et al. (2013) · Living Reviews in Relativity · doi:10.12942/lrr-2013-6 · Cited by 899
Quintom cosmology: Theoretical implications and observations
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Dark Energy Versus Modified Gravity
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Metadata
- Authors
- Armendáriz-Picón, C.
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2004-07-15
- Volume
- 2004
- Issue
- 07
- Pages
- 007-007
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2056331753
- Cited by
- 277
- References
- 63
- FWCI
- 4.14
- Type
- journal article
- Language
- en
- Open access
- green
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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