Zobrazeno 1 - 10
of 129
pro vyhledávání: '"Wirth, Jens"'
Autor:
Sebih, Mohammed ElAmine, Wirth, Jens
In this paper we consider a singular wave equation with distributional and more singular non-distributional coefficients and develop tools and techniques for the phase-space analysis of such problems. In particular we provide a detailed analysis for
Externí odkaz:
http://arxiv.org/abs/2002.00825
Autor:
Girardi, Giovanni, Wirth, Jens
In this paper we consider a Klein-Gordon model with time-dependent periodic coefficients. The aim is to investigate how the presence of the mass term influences energy estimates with respect to the case of vanishing mass, already treated in [18]. The
Externí odkaz:
http://arxiv.org/abs/2001.06837
Autor:
Brinker, Jonas, Wirth, Jens
In this paper, we study the group Fourier transform and the Kohn-Nirenberg quantization for homogeneous Lie groups as mappings between certain Gelfand triples. For this, we restrict our considerations to the case, where the homogeneous Lie group $G$
Externí odkaz:
http://arxiv.org/abs/2001.00250
Autor:
Georgiev, Vladimir, Wirth, Jens
Publikováno v:
Journal of Mathematical Physics 59, 071502 (2018)
This paper considers Hamiltonians with localised potentials and gives a variational characterisation of resonant coupling parameters, which allow to provide estimates for the first resonant parameter and in turn also to provide bounds for resonant fr
Externí odkaz:
http://arxiv.org/abs/1803.01813
Autor:
Wirth, Jens
Publikováno v:
Journal of Mathematical Analysis and Applications, 448:1 (2017) 293-318
We consider hyperbolic equations with time-dependent coefficients and develop an abstract framework to derive the asymptotic behaviour of the representation of solutions for large times. We are dealing with generic situations where the large-time asy
Externí odkaz:
http://arxiv.org/abs/1508.02635
Scatterings of electrons at quasiparticles or photons are very important for many topics in solid state physics, e.g., spintronics, magnonics or photonics, and therefore a correct numerical treatment of these scatterings is very important. For a quan
Externí odkaz:
http://arxiv.org/abs/1507.07420
Autor:
Wirth, Jens
Gegenstand der Dissertation ist die Untersuchung der asymptotischen Eigenschaften von Lösungen des Cauchy-Problems für eine Wellengleichung mit zeitabhängiger Dämpfung $b=b(t)$ und das Wechselspiel zwischen dem Verhalten des Koeffizienten $b(t)ge
Externí odkaz:
https://tubaf.qucosa.de/id/qucosa%3A22501
https://tubaf.qucosa.de/api/qucosa%3A22501/attachment/ATT-0/
https://tubaf.qucosa.de/api/qucosa%3A22501/attachment/ATT-0/
Publikováno v:
Advances in Differential Equations Vol. 20 No. 7-8 (2015), 661--696
In this paper we consider a wave model with non-effective mass and dissipation terms and provide asymptotic descriptions of its representation of solutions. In particular we conclude sharp estimates for a corresponding energy and estimates of dispers
Externí odkaz:
http://arxiv.org/abs/1408.0737
Autor:
Ruzhansky, Michael, Wirth, Jens
Publikováno v:
Journal of Functional Analysis, 267 (2014) 144--172
In this paper we develop the functional calculus for elliptic operators on compact Lie groups without the assumption that the operator is a classical pseudo-differential operator. Consequently, we provide a symbolic descriptions of complex powers of
Externí odkaz:
http://arxiv.org/abs/1307.1464