Zobrazeno 1 - 10
of 2 119
pro vyhledávání: '"Uggla, A."'
Autor:
Lappicy, Phillipo, Uggla, Claes
The Bianchi type $\mathrm{VI}_{-1/9}$, $\mathrm{VIII}$ and $\mathrm{IX}$ vacuum models all have 4-dimensional Hubble-normalized state spaces and are expected to have a generic initial oscillatory singularity, but the invariant boundary sets responsib
Externí odkaz:
http://arxiv.org/abs/2410.10375
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
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
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
Publikováno v:
Nursing Reports, Vol 14, Iss 3, Pp 1819-1827 (2024)
The spread of antimicrobial resistance is a global health concern, and resistance mediated by Extended-Spectrum Beta-Lactamases (ESBLs) can cause major consequences. The aim of this study was to explore individuals’ perceptions of their daily life
Externí odkaz:
https://doaj.org/article/970e88dacbcf4a04a36581e5b1dac64a
We use dynamical systems methods to study quintessence models in a spatially flat and isotropic spacetime with matter and a scalar field with potentials for which $\lambda(\varphi)=-V_{,\varphi}/V$ is bounded, thereby going beyond the exponential pot
Externí odkaz:
http://arxiv.org/abs/2209.09684
Publikováno v:
Transportation Research Interdisciplinary Perspectives, Vol 27, Iss , Pp 101219- (2024)
Drone traffic, consisting of anything from small quadcopters for video and photography to large eVTOL transporting people, is expected to grow rapidly as soon as the challenges currently barring urban flights can be solved. One of the main challenges
Externí odkaz:
https://doaj.org/article/3caad94fa05c4982980f8d23e9f61a85
We consider a dynamical systems formulation for models with an exponential scalar field and matter with a linear equation of state in a spatially flat and isotropic spacetime. In contrast to earlier work, which only considered linear hyperbolic fixed
Externí odkaz:
http://arxiv.org/abs/2201.07596
Publikováno v:
In Transportation Research Interdisciplinary Perspectives September 2024 27
Publikováno v:
In Physics of the Dark Universe May 2024 44