7.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Institute of Astrophysics and Space SciencesPT1.2k papers
- Centre National de la Recherche ScientifiqueFR1.1k papers
- Centro de Astrofísica da Universidade do PortoPT1k papers
- University of GenevaCH636 papers
- Instituto de Astrofísica de CanariasES591 papers
- Universidad de La LagunaES520 papers
- European Southern ObservatoryCL446 papers
- Aix-Marseille UniversitéFR434 papers
- University of LisbonPT430 papers
- Institut d'Astrophysique de ParisFR425 papers
- Leiden UniversityNL398 papers
- University of CambridgeGB398 papers
179 papers · 1 filter
Magnetovolume Effects in Heusler Compounds via First-Principles Calculations
J. N. Gonçalves, J. S. Amaral, V. S. Amaral
Heusler alloys are promising for several applications, including magnetic refrigeration, due to high magnetocaloric and magnetovolume effects. One way to optimize this potential is…
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…
Hyperfine local probe study of alkaline-earth manganites SrMnO3 and BaMnO3
J. N. Gonçalves, V. S. Amaral, J. G. Correia +3
We report perturbed angular correlation measurements with 111mCd/111Cd and 111In/111Cd probes, at the ISOLDE-CERN facility, in the manganite compounds BaMnO3 , with the 6H and 15R…
Quantitative recurrence for free semigroup actions
Maria Carvalho, Fagner B. Rodrigues, Paulo Varandas
We consider finitely generated free semigroup actions on a compact metric space and obtain quantitative information on Poincaré recurrence, average first return time and hitting fr…
Relativistic quantum speed limit time in dephasing noise
Salman Khan, Niaz Ali Khan
The behavior of quantum speed limit time (QSLT) for a single free spin particle described by Gaussian wavepackets in the framework of relativity under dephasing noise is inv…
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…
Absence of high-temperature ballistic transport in the spin- chain within the grand-canonical ensemble
J. M. P. Carmelo, T. Prosen
Whether in the thermodynamic limit, vanishing magnetic field , and nonzero temperature the spin stiffness of the spin- Heisenberg chain is finite or vani…
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…
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.…
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…
Mesons from (non) Abelian T-dual backgrounds
Georgios Itsios, Carlos Nunez, Dimitrios Zoakos
In this work we study mesonic excitations in a Quantum Field Theory dual to the non Abelian T-dual of , using a D6 brane probe on the Sfetsos-Thompson background.…
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…
Transit Shapes and Self Organising Maps as a Tool for Ranking Planetary Candidates: Application to Kepler and K2
David J. Armstrong, Don Pollacco, Alexandre Santerne
A crucial step in planet hunting surveys is to select the best candidates for follow up observations, given limited telescope resources. This is often performed by human `eyeballin…
A blueprint for a simultaneous test of quantum mechanics and general relativity in a space-based quantum optics experiment
Sam Pallister, Simon Coop, Valerio Formichella +12
In this paper we propose an experiment designed to observe a general-relativistic effect on single photon interference. The experiment consists of a folded Mach-Zehnder interferome…
CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
L. Suárez-Andrés, G. Israelian, J. I. González Hernández +4
Context. Carbon, oxygen and nitrogen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation an…
A note on the finite basis and finite rank properties for pseudovarieties of semigroups
J. Almeida, M. H. Shahzamanian
The finite basis property is often connected with the finite rank property, which it entails. Many examples have been produced of finite rank varieties which are not finitely based…
Assessing the quality of restored images in optical long-baseline interferometry
Nuno Gomes, Paulo J. V. Garcia, Éric Thiébaut
Assessing the quality of aperture synthesis maps is relevant for benchmarking image reconstruction algorithms, for the scientific exploitation of data from optical long-baseline in…