Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Dima, Alexandru"'
We study the linear response of four dimensional magnetized black holes and regular topological stars arising from dimensional compactification of Einstein-Maxwell theory in five dimensions. We consider both radial and nonradial perturbations and stu
Externí odkaz:
http://arxiv.org/abs/2406.19327
Autor:
Masala, Mihai, Ilie-Ablachim, Denis C., Dima, Alexandru, Corlatescu, Dragos, Zavelca, Miruna, Olaru, Ovio, Terian, Simina, Terian, Andrei, Leordeanu, Marius, Velicu, Horia, Popescu, Marius, Dascalu, Mihai, Rebedea, Traian
In recent years, Large Language Models (LLMs) have achieved almost human-like performance on various tasks. While some LLMs have been trained on multilingual data, most of the training data is in English; hence, their performance in English greatly e
Externí odkaz:
http://arxiv.org/abs/2406.18266
Black holes have a unique sensitivity to the presence of ultralight matter fields or modifications of the underlying theory of gravity. In the present paper we combine both features by studying an ultralight, dynamical scalar field that is nonminimal
Externí odkaz:
http://arxiv.org/abs/2305.07704
Publikováno v:
Phys. Rev. D 104, 084017 (2021)
Scalar-tensor theories whose phenomenology differs significantly from general relativity on large (e.g. cosmological) scales do not typically pass local experimental tests (e.g. in the solar system) unless they present a suitable "screening mechanism
Externí odkaz:
http://arxiv.org/abs/2107.04359
Publikováno v:
Phys. Rev. Lett. 125, 231101 (2020)
We study scalar fields in a black hole background and show that, when the scalar is suitably coupled to curvature, rapid rotation can induce a tachyonic instability. This instability, which is the hallmark of spontaneous scalarization in the lineariz
Externí odkaz:
http://arxiv.org/abs/2006.03095
Autor:
Dima, Alexandru, Barausse, Enrico
Publikováno v:
Class. Quantum Grav. 37 175006 (2020)
Photons propagating in a plasma acquire an effective mass $\mu$, which is given by the plasma frequency and which scales with the square root of the plasma density. As noted previously by Conlon and Herdeiro, for electron number densities $n_e\sim 10
Externí odkaz:
http://arxiv.org/abs/2001.11484
Autor:
Dima, Alexandru, Vernizzi, Filippo
Publikováno v:
Phys. Rev. D 97, 101302 (2018)
Screening mechanisms are essential features of dark energy models mediating a fifth force on large scales. We study the regime of strong scalar field nonlinearities, known as Vainshtein screening, in the most general scalar-tensor theories propagatin
Externí odkaz:
http://arxiv.org/abs/1712.04731
Autor:
Dima, Alexandru1,2 (AUTHOR) alexandru.dima1609@stud.acs.upb.ro, Ruseti, Stefan1 (AUTHOR) stefan.ruseti@upb.ro, Iorga, Denis2,3 (AUTHOR) cosmin@research-technology.ro, Banica, Cosmin Karl2 (AUTHOR), Dascalu, Mihai1,2 (AUTHOR) mihai.dascalu@upb.ro
Publikováno v:
Information (2078-2489). Jun2023, Vol. 14 Issue 6, p321. 23p.
Autor:
Dima, Alexandru1, Oprisan, Alexandra1,2 alexandra_oprisan@yahoo.com, Bastian, Alexandra E.3,4
Publikováno v:
Romanian Journal of Neurology. 2020, Vol. 19 Issue 2, p127-131. 5p.
Publikováno v:
Journal of Industrial Design and Engineering Graphics, Iss 9 (2014)
In this paper an experimental method for the investigations of flow structures encountered by automobiles was performed on two different vehicles. Currently are two methods to measure the drag, the first is to simulate the air flow with computational
Externí odkaz:
https://doaj.org/article/9d449253f619419091eb04cd36425c00