- University of LisbonPT1.3k papers
- Universidade Técnica de LisboaPT388 papers
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13 papers · 2 filters
Supernovae constraints on models of dark energy revisited
M. C. Bento, O. Bertolami, N. M. C. Santos +1
We use the Type Ia Supernova gold sample data of Riess {\it et al} in order to constrain three models of dark energy. We study the Cardassian model, the Dvali-Turner gravity modifi…
Site Evaluation and RFI spectrum measurements in Portugal at the frequency range 0.408-10 GHz for a GEM polarized galactic radio emission experiment
R. Fonseca, D. Barbosa, L. Cupido +3
We probed for Radio Frequency Interference (RFI) for the three potential Galactic Emission Mapping Experiment (GEM) sites at Portugal using custom made omnidirectional disconic ant…
Spectroscopic confirmation of high-redshift supernovae with the ESO VLT
C. Lidman, D. A. Howell, G. Folatelli +44
We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using Type Ia supernovae (SNe Ia) over a wide r…
Long-time evolution of magnetic fields in relativistic GRB shocks
Mikhail V. Medvedev, Massimiliano Fiore, Ricardo A. Fonseca +2
We investigate the long-time evolution of magnetic fields generated by the two-stream instability at ultra- and sub-relativistic astrophysical collisionless shocks. Based on 3D PIC…
Astrophysical Constraints on Scalar Field Models
O. Bertolami, J. Paramos
We use stellar structure dynamics arguments to extract bounds on the relevant parameters of scalar field models: the putative scalar field mediator of a fifth force with a Yukawa p…
Multifrequency analysis of 21 cm fluctuations from the Era of Reionization
M. G. Santos, A. Cooray, L. Knox
We study the prospects for extracting detailed statistical properties of the neutral Hydrogen distribution during the era of reionization using the brightness temperature fluctuati…