Zobrazeno 1 - 10
of 1 277
pro vyhledávání: '"Siemssen"'
Exponentially expanding space-times play a central role in contemporary cosmology, most importantly in the theory of inflation and in the Dark Energy driven expansion in the late universe. In this work, we give a complete list of de Sitter solutions
Externí odkaz:
http://arxiv.org/abs/2206.07774
Publikováno v:
Classical and Quantum Gravity, Volume 39, Issue 12, Page 125004, Year 2022
This article presents numerical work on a special case of the cosmological semiclassical Einstein equation (SCE). The SCE describes the interaction of relativistic quantum matter by the expected value of the renormalized stress-energy tensor of a qua
Externí odkaz:
http://arxiv.org/abs/2112.15050
We prove existence and uniqueness of solutions of the semiclassical Einstein equation in flat cosmological spacetimes driven by a quantum massive scalar field with arbitrary coupling to the scalar curvature. In the semiclassical approximation, the ba
Externí odkaz:
http://arxiv.org/abs/2007.14665
Autor:
Dereziński, Jan, Siemssen, Daniel
In the first part of our paper we analyze bisolutions and inverses of (non-autonomous) evolution equations. We are mostly interested in pseudo-unitary evolutions on Krein spaces, which naturally arise in linear Quantum Field Theory. We prove that wit
Externí odkaz:
http://arxiv.org/abs/1912.10692
Autor:
Maithily S. Nanadikar, Ana M. Vergel Leon, Jia Guo, Gijsbert J. van Belle, Aline Jatho, Elvina S. Philip, Astrid F. Brandner, Rainer A. Böckmann, Runzhu Shi, Anke Zieseniss, Carla M. Siemssen, Katja Dettmer, Susanne Brodesser, Marlen Schmidtendorf, Jingyun Lee, Hanzhi Wu, Cristina M. Furdui, Sören Brandenburg, Joseph R. Burgoyne, Ivan Bogeski, Jan Riemer, Arpita Chowdhury, Peter Rehling, Tobias Bruegmann, Vsevolod V. Belousov, Dörthe M. Katschinski
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-19 (2023)
Abstract Redox signaling and cardiac function are tightly linked. However, it is largely unknown which protein targets are affected by hydrogen peroxide (H2O2) in cardiomyocytes that underly impaired inotropic effects during oxidative stress. Here, w
Externí odkaz:
https://doaj.org/article/46b0dc091943496094992a4e0a96de5f
Akademický článek
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Autor:
Gottschalk, Hanno, Siemssen, Daniel
Publikováno v:
Ann. Henri Poincar\'e 22, 3915-3964 (2021)
We develop a comprehensive framework in which the existence of solutions to the semiclassical Einstein equation (SCE) in cosmological spacetimes is shown. Different from previous work on this subject, we do not restrict to the conformally coupled sca
Externí odkaz:
http://arxiv.org/abs/1809.03812
Publikováno v:
Annales Henri Poincar\'e 21, 1595-1635 (2020)
One can argue that on flat space $\mathbb{R}^d$ the Weyl quantization is the most natural choice and that it has the best properties (e.g. symplectic covariance, real symbols correspond to Hermitian operators). On a generic manifold, there is no dist
Externí odkaz:
http://arxiv.org/abs/1806.01572
Autor:
Dereziński, Jan, Siemssen, Daniel
Publikováno v:
Pure Appl. Analysis 1 (2019) 215-261
We develop a theory of the Klein-Gordon equation on curved spacetimes. Our main tool is the method of (non-autonomous) evolution equations on Hilbert spaces. This approach allows us to treat low regularity of the metric, of the electromagnetic potent
Externí odkaz:
http://arxiv.org/abs/1709.03911
Publikováno v:
Phys. Rev. D 97, 025019 (2018)
Pre-metric electrodynamics is a covariant framework for electromagnetism with a general constitutive law. Its lightcone structure can be more complicated than that of Maxwell theory as is shown by the phenomenon of birefringence. We study the energy
Externí odkaz:
http://arxiv.org/abs/1709.01760