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157 papers · 1 filter
Testing the Flyby Anomaly with the GNSS Constellation
O. Bertolami, F. Francisco, P. J. S. Gil +1
We propose the concept of a space mission to probe the so called flyby anomaly, an unexpected velocity change experienced by some deep-space probes using earth gravity assists. The…
Finding proto-spectroscopic binaries: Precise multi-epoch radial velocities of 7 protostars in rho-Ophiuchus
P. Viana Almeida, C. Melo, N. C. Santos +3
The formation of spectroscopic binaries (SB) may be a natural byproduct of star formation. The early dynamical evolution of multiple stellar systems after the initial fragmentation…
Towards precise asteroseismology of solar-like stars
A. Grigahcène, M. -A. Dupret, S. G. Sousa +4
Adiabatic modeling of solar-like oscillations cannot exceed a certain level of precision for fitting individual frequencies. This is known as the problem of near surface effects on…
Finite automata for Schreier graphs of virtually free groups
Pedro Silva, Xaro Soler-Escrivà, Enric Ventura
The Stallings construction for finitely generated subgroups of free groups is generalized by introducing the concept of Stallings section, which allows an eficient computation of t…
Magnetic catalysis with massive dynamical flavours
Johanna Erdmenger, Veselin G. Filev, Dimitrios Zoakos
Within gauge/gravity duality, we construct a backreacted supergravity background dual to SU(Nc) N=4 SYM coupled to Nf massive fundamental flavours in the presence of an external ma…
Discovery of the longest-period rapidly oscillating Ap star HD177765
D. Alentiev, O. Kochukhov, T. Ryabchikova +3
We present the discovery of a long-period, rapidly oscillating Ap star, HD177765. Using high-resolution time-series observations obtained with UVES at the ESO VLT telescope, we fou…