7.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT1.3k papers
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159 papers · 1 filter
Quantum corrections for the cubic Galileon in the covariant language
Ippocratis D. Saltas, Vincenzo Vitagliano
We present for the first time an explicit exposition of quantum corrections within the cubic Galileon theory including the effect of quantum gravity, in a background- and gauge-inv…
Stretching and Kibble scaling regimes for Hubble-damped defect networks
C. J. A. P. Martins, I. Yu. Rybak, A. Avgoustidis +1
The cosmological evolution of topological defect networks can broadly be divided into two stages. At early times they are friction-dominated due to particle scattering and therefor…
Period spacings in red giants; III. Coupling factors of mixed modes
B. Mosser, C. Pinçon, K. Belkacem +2
The power of asteroseismology relies on the capability of global oscillations to infer the stellar structure. For evolved stars, we benefit from unique information directly carried…
CANDELS Multiwavelength Catalogs: Source Identification and Photometry in the CANDELS COSMOS Survey Field
H. Nayyeri, S. Hemmati, B. Mobasher +36
We present a multi-wavelength photometric catalog in the COSMOS field as part of the observations by the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). T…
New Constraints on Spatial Variations of the Fine Structure Constant from Clusters of Galaxies
I. de Martino, C. J. A. P. Martins, H. Ebeling +1
We have constrained the spatial variation of the fine structure constant using multi-frequency measurements of the thermal Sunyaev-Zeldovich effect of 618 X-ray selected clusters.…
Dark energy constraints from ESPRESSO tests of the stability of fundamental couplings
A. C. O. Leite, C. J. A. P. Martins, P. Molaro +2
ESPRESSO is a high-resolution-ultra-stable spectrograph for the VLT, whose commissioning will start in 2017. One of its key science goals is to test the stability of nature's funda…
Gaia FGK Benchmark stars: Opening the black box of stellar element abundance determination
P. Jofre, U. Heiter, C. C. Worley +10
Gaia and its complementary spectroscopic surveys combined will yield the most comprehensive database of kinematic and chemical information of stars in the Milky Way. The Gaia FGK b…
Exploring Cosmic Origins with CORE: Inflation
CORE Collaboration, Fabio Finelli, Martin Bucher +129
We forecast the scientific capabilities to improve our understanding of cosmic inflation of CORE, a proposed CMB space satellite submitted in response to the ESA fifth call for a m…
Non-standard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom
Ignacy Sawicki, Ippocratis D. Saltas, Mariele Motta +2
In many generalized models of gravity, perfect fluids in cosmology give rise to gravitational slip. Simultaneously, in very broad classes of such models, the propagation of gravita…
Exploring Cosmic Origins with CORE: Cosmological Parameters
Eleonora Di Valentino, Thejs Brinckmann, Martina Gerbino +125
We forecast the main cosmological parameter constraints achievable with the CORE space mission which is dedicated to mapping the polarisation of the Cosmic Microwave Background (CM…
A large H survey of star formation in relaxed and merging galaxy cluster environments at
Andra Stroe, David Sobral, Ana Afonso +4
We present the first results from the largest H survey of star formation and AGN activity in galaxy clusters. Using 9 different narrow band filters, we select H emitt…
Constraining Logotropic Unified Dark Energy Models
V. M. C. Ferreira, P. P. Avelino
A unification of dark matter and dark energy in terms of a logotropic perfect dark fluid has recently been proposed, where deviations with respect to the standard mode…
On the relation between activity-related frequency shifts and the sunspot distribution over the solar cycle 23
A. R. G. Santos, M. S. Cunha, P. P. Avelino +2
The activity-related variations in the solar acoustic frequencies have been known for 30 years. However, the importance of the different contributions is still not well established…
Learning about the latitudinal distribution of starspots through the periodogram analysis of photometric data
A. R. G. Santos, M. S. Cunha, P. P. Avelino +2
Starspots are cooler and darker than the stellar surface. Therefore, the emitted flux of a star changes when spots are visible on its surface. The presence of spots together with t…
Starspot signature on the light curve: Learning about the latitudinal distribution of spots
A. R. G. Santos, M. S. Cunha, P. P. Avelino +2
Quasi-periodic modulations of the stellar light curve may result from dark spots crossing the visible stellar disc. Due to differential rotation, spots at different latitudes gener…
Star Formation In The Cluster Merger DLSCL J0916.2+2953
A. S. Mansheim, B. C. Lemaux, W. A. Dawson +3
We investigate star formation in DLSCL J0916.2+2953, a dissociative merger of two clusters at z=0.53 that has progressed Gyr since first pass-through. We attemp…
Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B stars
P. I. Pápics, A. Tkachenko, T. Van Reeth +9
Massive stars are important building blocks of the Universe, and their stellar structure and evolution models are fundamental cornerstones of various fields in modern astrophysics.…
Models for Small-Scale Structure on Cosmic Strings: II. Scaling and its stability
J. P. P. Vieira, C. J. A. P. Martins, E. P. S. Shellard
We make use of the formalism described in a previous paper [Martins {\it et al.} Phys. Rev. D90 (2014) 043518] to address general features of wiggly cosmic string evolution. In par…
Ionization and feedback in Ly halos around two radio galaxies at z2.5
S. G. Morais, A. Humphrey, M. Villar-Martín +6
We present new spectroscopic observations of two high redshift radio galaxies, TXS 0211-122 (z=2.34) and TXS 0828+193 (z=2.57), known to be associated with large Ly halos. The o…
Asteroseismic modelling of the Binary HD 176465
B. Nsamba, M. J. P. F. G. Monteiro, T. L. Campante +4
The detection and analysis of oscillations in binary star systems is critical in understanding stellar structure and evolution. This is partly because such systems have the same in…
A super-Earth orbiting the nearby M-dwarf GJ 536
A. Suárez Mascareño, J. I. González Hernández, R. Rebolo +13
We report the discovery of a super-Earth orbiting the star GJ 536 based on the analysis of the radial-velocity time series from the HARPS and HARPS-N spectrographs. GJ 536 b is a p…
Considerations on the thermal equilibrium between matter and the cosmic horizon
José Pedro Mimoso, Diego Pavón
A common feature in the thermodynamic analysis of homogeneous and isotropic world models is the assumption that the temperature of the fluids inside the cosmic horizon (including d…
The structural and size evolution of star-forming galaxies over the last 11 Gyrs
Ana Paulino-Afonso, David Sobral, Fernando Buitrago +1
We present new results on the evolution of rest-frame blue/UV sizes and Sersic indices of H-selected star-forming galaxies over the last 11 Gyrs. We investigate how the perceive…
The SpaceInn-SISMA database: characterization of a large sample of variable and active stars by means of HARPS spectra
M. Rainer, E. Poretti, A. Mistò +6
We created a large database of physical parameters and variability indicators by fully reducing and analysing the large number of spectra taken to complement the asteroseismic obse…