| 1. |
- Levamaki, Henrik, et al.
(författare)
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Kullback-Leibler and relative Fisher information as descriptors of locality
- 2018
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Ingår i: International Journal of Quantum Chemistry. - : WILEY. - 0020-7608 .- 1097-461X. ; 118:12
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Tidskriftsartikel (refereegranskat)abstract
- Kullback-Leibler and relative Fisher information functionals are applied in studying deviation from local density approximation. The reduced density gradient s and the local kinetic energy parameter alpha are key ingredients of these new locality descriptors. The relative Kullback-Leibler information density contains extra knowledge as it is negative where the given probability density is smaller than the reference density. The relative Fisher information incorporates the highest order deviations from the uniform electron gas approximation.
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| 2. |
- Sundell, Peter, et al.
(författare)
-
Can a void mimic the Lambda in Lambda CDM?
- 2015
-
Ingår i: Journal of Cosmology and Astroparticle Physics. - : IOP PUBLISHING LTD. - 1475-7516. ; :8
-
Tidskriftsartikel (refereegranskat)abstract
- We investigate Lematre-Tolman-Bondi (LTB) models, whose early time evolution and bang time are homogeneous and the distance-redshift relation and local Hubble parameter are inherited from the Lambda CDM model. We show that the obtained LTB models and the Lambda CDM model predict different relative local expansion rates and that the Hubble functions of the models diverge increasingly with redshift. The LTB models show tension between low redshift baryon acoustic oscillation and supernova observations and including Lyman-alpha forest or cosmic microwave background observations only accentuates the better fit of the Lambda CDM model compared to the LTB model. The result indicates that additional degrees of freedom are needed to explain the observations, for example by renouncing spherical symmetry, homogeneous bang time, negligible effects of pressure, or the early time homogeneity assumption.
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| 3. |
- Sundell, Peter, et al.
(författare)
-
Can a void mimic the Λ in ΛCDM?
- 2015
-
Ingår i: Journal of Cosmology and Astroparticle Physics. - : IOP Publishing. - 1475-7516. ; :8
-
Tidskriftsartikel (refereegranskat)abstract
- We investigate Lematre-Tolman-Bondi (LTB) models, whose early time evolution and bang time are homogeneous and the distance-redshift relation and local Hubble parameter are inherited from the Lambda CDM model. We show that the obtained LTB models and the Lambda CDM model predict different relative local expansion rates and that the Hubble functions of the models diverge increasingly with redshift. The LTB models show tension between low redshift baryon acoustic oscillation and supernova observations and including Lyman-alpha forest or cosmic microwave background observations only accentuates the better fit of the Lambda CDM model compared to the LTB model. The result indicates that additional degrees of freedom are needed to explain the observations, for example by renouncing spherical symmetry, homogeneous bang time, negligible effects of pressure, or the early time homogeneity assumption.
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