Zobrazeno 1 - 10
of 7 752
pro vyhledávání: '"Alho A"'
Autor:
Alho, Artur, Uggla, Claes
We derive new simple approximations for quintessence solutions to Einsteins's field equations in spatially homogeneous, isotropic and flat spacetimes. The approximations are typically an order of magnitude more accurate than anything available in the
Externí odkaz:
http://arxiv.org/abs/2407.14378
Autor:
Battarbee, Markus, Papadakis, Konstantinos, Ganse, Urs, Hokkanen, Jaro, Kotipalo, Leo, Pfau-Kempf, Yann, Alho, Markku, Palmroth, Minna
Vlasiator is a space plasma simulation code which models near-Earth ion-kinetic dynamics in three spatial and three velocity dimensions. It is highly parallelized, modeling the Vlasov equation directly through the distribution function, discretized o
Externí odkaz:
http://arxiv.org/abs/2406.02201
Tracking quintessence, in a spatially flat and isotropic space-time with a minimally coupled canonical scalar field and an asymptotically inverse power-law potential $V(\varphi)\propto\varphi^{-p}$, $p>0$, as $\varphi\rightarrow0$, is investigated. T
Externí odkaz:
http://arxiv.org/abs/2311.16775
Publikováno v:
Helminthologia, Vol 53, Iss 3, Pp 276-280 (2016)
Here we report the case of a diagnostic and treatment challenge in a four-month old dog from England, presented with one-month history of unproductive cough. Antigen blood test for Angiostrongylus vasorum infection was negative. Thoracic radiographs
Externí odkaz:
https://doaj.org/article/f135d97cc2844aaaab77d4495f04478a
Autor:
Bouri, Ioanna, Franssila, Fanni, Alho, Markku, Cozzani, Giulia, Zaitsev, Ivan, Palmroth, Minna, Roos, Teemu
Topological analysis of the magnetic field in simulated plasmas allows the study of various physical phenomena in a wide range of settings. One such application is magnetic reconnection, a phenomenon related to the dynamics of the magnetic field topo
Externí odkaz:
http://arxiv.org/abs/2307.09469
Publikováno v:
Class.Quant.Grav. 41 (2024) 7, 073002
The purpose of this review it to present a renewed perspective of the problem of self-gravitating elastic bodies under spherical symmetry. It is also a companion to the papers [Phys. Rev. D105, 044025 (2022)], [Phys. Rev. D106, L041502 (2022)], and [
Externí odkaz:
http://arxiv.org/abs/2307.03146
Publikováno v:
Phys.Rev.D 109 (2024) 6, 064037
We present a model of relativistic elastic stars featuring scale invariance. This implies a linear mass-radius relation and the absence of a maximum mass. The most compact spherically symmetric configuration that is radially stable and satisfies all
Externí odkaz:
http://arxiv.org/abs/2306.16584
Autor:
Alho, Artur, Uggla, Claes
The equations for quintessential $\alpha$-attractor inflation with a single scalar field, radiation and matter in a spatially flat FLRW spacetime are recast into a regular dynamical system on a compact state space. This enables a complete description
Externí odkaz:
http://arxiv.org/abs/2306.15326
Autor:
Jing, Peiyu, Seshadri, Ravi, Sakai, Takanori, Shamshiripour, Ali, Alho, Andre Romano, Lentzakis, Antonios, Ben-Akiva, Moshe E.
The distributional impacts of congestion pricing have been widely studied in the literature and the evidence on this is mixed. Some studies find that pricing is regressive whereas others suggest that it can be progressive or neutral depending on the
Externí odkaz:
http://arxiv.org/abs/2305.07318
Autor:
M. Alho, G. Cozzani, I. Zaitsev, F. T. Kebede, U. Ganse, M. Battarbee, M. Bussov, M. Dubart, S. Hoilijoki, L. Kotipalo, K. Papadakis, Y. Pfau-Kempf, J. Suni, V. Tarvus, A. Workayehu, H. Zhou, M. Palmroth
Publikováno v:
Annales Geophysicae, Vol 42, Pp 145-161 (2024)
Magnetic reconnection is a crucially important process for energy conversion in plasma physics, with the substorm cycle of Earth's magnetosphere and solar flares being prime examples. While 2D models have been widely applied to study reconnection, in
Externí odkaz:
https://doaj.org/article/bb5b2047d4044a259685d023a62e4c42