Matches in SemOpenAlex for { <https://semopenalex.org/work/W4386348075> ?p ?o ?g. }
Showing items 1 to 61 of
61
with 100 items per page.
- W4386348075 abstract "We explore a generalised unified dark energy model that incorporates a non-minimal interaction between a tachyonic fluid and an additional scalar field. Specifically, we require that the second field possesses a vacuum energy, introducing an ineliminable offset due to a symmetry-breaking mechanism. After the transition (occurring as due to the symmetry-breaking mechanism of the second field), the corresponding equation of state (EoS) takes the form of a combination between a generalised Chaplygin gas (GCG) component and a cosmological constant contribution. We reinterpret this outcome by drawing parallels to the so-called Murnaghan EoS, widely-employed in the realm of solid-state physics to characterise fluids that, under external pressure, counteract the pressure's effect. We examine the dynamic behaviour of this model and highlight its key distinctions compared to the GCG model. We establish parameter bounds that clarifies the model's evolution across cosmic expansion history, showing that it, precisely, exhibits behaviour akin to a logotropic fluid that eventually converges to the $Lambda$CDM model in the early universe, while behaving as a logotropic or Chaplygin gas at intermediate and late times respectively. We explain our findings from a thermodynamic perspective, and determine the small perturbations in the linear regime. At very early times, the growth factor flattens as expected while the main departures occur at late times, where the Murnagham EoS results in a more efficient growth of perturbations. We discuss this deviation in view of current observations and conclude that our model is a suitable alternative to the standard cosmological paradigm, introducing the concept of a matter-like field with non-zero pressure." @default.
- W4386348075 created "2023-09-02" @default.
- W4386348075 creator A5030099392 @default.
- W4386348075 creator A5085498907 @default.
- W4386348075 creator A5089975002 @default.
- W4386348075 date "2023-08-30" @default.
- W4386348075 modified "2023-09-28" @default.
- W4386348075 title "Unifying the dark sector through a single matter fluid with non-zero pressure" @default.
- W4386348075 doi "https://doi.org/10.48550/arxiv.2308.15776" @default.
- W4386348075 hasPublicationYear "2023" @default.
- W4386348075 type Work @default.
- W4386348075 citedByCount "0" @default.
- W4386348075 crossrefType "posted-content" @default.
- W4386348075 hasAuthorship W4386348075A5030099392 @default.
- W4386348075 hasAuthorship W4386348075A5085498907 @default.
- W4386348075 hasAuthorship W4386348075A5089975002 @default.
- W4386348075 hasBestOaLocation W43863480751 @default.
- W4386348075 hasConcept C110521144 @default.
- W4386348075 hasConcept C121332964 @default.
- W4386348075 hasConcept C159249277 @default.
- W4386348075 hasConcept C166861157 @default.
- W4386348075 hasConcept C172790937 @default.
- W4386348075 hasConcept C204795200 @default.
- W4386348075 hasConcept C26405456 @default.
- W4386348075 hasConcept C2777515927 @default.
- W4386348075 hasConcept C33332235 @default.
- W4386348075 hasConcept C37914503 @default.
- W4386348075 hasConcept C44870925 @default.
- W4386348075 hasConcept C53810900 @default.
- W4386348075 hasConcept C62520636 @default.
- W4386348075 hasConcept C74650414 @default.
- W4386348075 hasConceptScore W4386348075C110521144 @default.
- W4386348075 hasConceptScore W4386348075C121332964 @default.
- W4386348075 hasConceptScore W4386348075C159249277 @default.
- W4386348075 hasConceptScore W4386348075C166861157 @default.
- W4386348075 hasConceptScore W4386348075C172790937 @default.
- W4386348075 hasConceptScore W4386348075C204795200 @default.
- W4386348075 hasConceptScore W4386348075C26405456 @default.
- W4386348075 hasConceptScore W4386348075C2777515927 @default.
- W4386348075 hasConceptScore W4386348075C33332235 @default.
- W4386348075 hasConceptScore W4386348075C37914503 @default.
- W4386348075 hasConceptScore W4386348075C44870925 @default.
- W4386348075 hasConceptScore W4386348075C53810900 @default.
- W4386348075 hasConceptScore W4386348075C62520636 @default.
- W4386348075 hasConceptScore W4386348075C74650414 @default.
- W4386348075 hasLocation W43863480751 @default.
- W4386348075 hasOpenAccess W4386348075 @default.
- W4386348075 hasPrimaryLocation W43863480751 @default.
- W4386348075 hasRelatedWork W1694949864 @default.
- W4386348075 hasRelatedWork W1977236485 @default.
- W4386348075 hasRelatedWork W1982988338 @default.
- W4386348075 hasRelatedWork W2005632737 @default.
- W4386348075 hasRelatedWork W2146697425 @default.
- W4386348075 hasRelatedWork W2949313841 @default.
- W4386348075 hasRelatedWork W3029896443 @default.
- W4386348075 hasRelatedWork W4293772119 @default.
- W4386348075 hasRelatedWork W4323651462 @default.
- W4386348075 hasRelatedWork W52933718 @default.
- W4386348075 isParatext "false" @default.
- W4386348075 isRetracted "false" @default.
- W4386348075 workType "article" @default.