Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Leila L. Graef"'
Publikováno v:
Universe, Vol 10, Iss 9, p 371 (2024)
We revisit the proposal that an energy transfer from dark energy into dark matter can be described in field theory by a first order phase transition. We analyze a metastable dark energy model proposed in the literature, using updated constraints on t
Externí odkaz:
https://doaj.org/article/ba331e5260ab4f1199452d8c51ddb8d8
We analyse the H0-tension problem in the context of models of the early universe that predict a blue tilted spectrum of primordial gravitational waves (GW's). By considering the GW's contribution, Neff^GW, to the effective number of relativistic degr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d47c0c37677ee4f1f0e7e18f314d30b
http://arxiv.org/abs/1809.04501
http://arxiv.org/abs/1809.04501
Autor:
Leila L. Graef, Rudnei O. Ramos
Publikováno v:
Physical Review D. 98
Warm inflation is analyzed in the context of loop quantum cosmology (LQC). The bounce in LQC provides a mean through which a Liouville measure can be defined, which has been used previously to characterize the a priori probability for inflation in LQ
Publikováno v:
Physical Review
We discuss the effect of super-Hubble cosmological fluctuations on the locally measured Hubble expansion rate. We consider a large bare cosmological constant in the early universe in the presence of scalar field matter (the dominant matter component)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9ae8068d830700afd110fd8d12a47af
http://arxiv.org/abs/1807.07494
http://arxiv.org/abs/1807.07494
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2018:066-066
In a previous communication we showed that a joint analysis of Cosmic Microwave Background (CMB) data and the current measurement of the local expansion rate favours a model with a scale invariant spectrum (HZ) over the minimal $\Lambda$CDM scenario
Autor:
Robert Brandenberger, Leila L. Graef
Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al recently suggested that, by breaking the assumption of spatial diffeomorphism invariance in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::930700068b48c56b03069a2f7b33843d
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2017:013-013
The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polarization data. However, when the inflation consistency relation is relaxe
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2017:003-003
We combine current measurements of the local expansion rate, $H_0$, and Big Bang Nucleosynthesis (BBN) estimates of helium abundance with the latest cosmic microwave background (CMB) data from the Planck Collaboration to discuss the observational via
Autor:
André A. Costa, Elcio Abdalla, Leila L. Graef, Andrea Coelho, Elisa G. M. Ferreira, C. E. Pellicer, Daniel C. Guariento
We consider a toy model to analyze the consequences of dark matter interaction with a dark energy background on the overall rotation of galaxy clusters and the misalignment between their dark matter and baryon distributions when compared to {\Lambda}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e78243e02dfa08e6ae399dfc1ed6207
http://arxiv.org/abs/1102.5113
http://arxiv.org/abs/1102.5113