Zobrazeno 1 - 10
of 4 450
pro vyhledávání: '"P. Ekstrom"'
Gaussian process regression is a frequently used statistical method for flexible yet fully probabilistic non-linear regression modeling. A common obstacle is its computational complexity which scales poorly with the number of observations. This is es
Externí odkaz:
http://arxiv.org/abs/2406.13691
Autor:
Costa, G., Dumont, T., Lançon, A., Palacios, A., Charbonnel, C., Prugniel, P., Ekstrom, S., Georgy, C., Branco, V., Coelho, P., Martins, L., Borisov, S., Voggel, K., Chantereau, W.
A common property of globular clusters (GC) is to host multiple populations characterized by peculiar chemical abundances. Recent photometric studies suggest that the He content could vary between the populations of a GC by up to $\Delta$He $\sim$ 0.
Externí odkaz:
http://arxiv.org/abs/2405.16505
Autor:
Tsiatsiou, Sophie, Sibony, Yves, Nandal, Devesh, Sciarini, Luca, Hirai, Yutaka, Ekstrom, Sylvia, Farrell, Eoin, Murphy, Laura, Choplin, Arthur, Hirschi, Raphael, Chiappini, Cristina, Liu, Boyuan, Bromm, Volker, Groh, Jose, Meynet, Georges
Publikováno v:
A&A 687, A307 (2024)
The first stars might have been fast rotators. This would have important consequences for their radiative, mechanical and chemical feedback. We discuss the impact of fast initial rotation on the evolution of massive Population III models and on their
Externí odkaz:
http://arxiv.org/abs/2404.16512
Solving combinatorial optimization problems using variational quantum algorithms to be executed on near-term quantum devices has gained a lot of attraction in recent years. Currently, most works have focused on single-objective problems. In contrast,
Externí odkaz:
http://arxiv.org/abs/2312.14151
We present evolutionary models of massive, accreting population III stars with constant and variable accretion rates until the end of silicon burning, with final masses of 1000 - 3000 Msol. In all our models, after the core-hydrogen-burning phase, th
Externí odkaz:
http://arxiv.org/abs/2309.04435
Mass-loss in red supergiants (RSGs) is generally recognized to be episodic, but mass-loss prescriptions fail to reflect this. Evolutionary models show that the total amount of mass lost during this phase determines if these stars evolve to warmer tem
Externí odkaz:
http://arxiv.org/abs/2211.14147
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024)
Abstract Independent component analysis (ICA) is a widely used blind source separation method for signal pre-processing. The determination of the number of independent components (ICs) is crucial for achieving optimal performance, as an incorrect cho
Externí odkaz:
https://doaj.org/article/583f83982eb94edc9ba88039e27f63e6
Publikováno v:
Frontiers in Neurology, Vol 15 (2024)
IntroductionThe aetiology of transient global amnesia (TGA) is still a matter of debate. Besides ischemia of the mesial temporal lobe including the hippocampus, migraine-like mechanisms, epileptic seizures affecting mnestic structures, or venous cong
Externí odkaz:
https://doaj.org/article/8e3240ae750e4b8bbf748b03aeadd4b5
Causal inference can estimate causal effects, but unless data are collected experimentally, statistical analyses must rely on pre-specified causal models. Causal discovery algorithms are empirical methods for constructing such causal models from data
Externí odkaz:
http://arxiv.org/abs/2202.12813
Autor:
Song, H. F., Meynet, G., Maeder, A., Mowlavi, N., Stroud, S. R., Keszthelyi, Z., Ekstrom, S., Eggenberger, P., Georgy, C., Wade, G. A., Qin, Y.
Publikováno v:
A&A 657, A60 (2022)
Sigma Ori E, a massive helium B-type star, shows a high surface rotation and a strong surface magnetic field potentially challenging the process of wind magnetic braking. The Gaia satellite provides an accurate distance to that star and confirms its
Externí odkaz:
http://arxiv.org/abs/2108.13734