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Gaudin Models and Multipoint Conformal Blocks III: Comb channel coordinates and OPE factorisation
(2021)arXivWe continue the exploration of multipoint scalar comb channel blocks for conformal field theories in 3D and 4D. The central goal here is to construct novel comb channel cross ratios that are well adapted to perform projections onto all intermediate primary fields. More concretely, our new set of cross ratios includes three for each intermediate mixed symmetry tensor exchange. These variables are designed such that the associated power ...Working Paper -
AdaptOver: Adaptive Overshadowing Attacks in Cellular Networks
(2021)arXivIn cellular networks, attacks on the communication link between a mobile device and the core network significantly impact privacy and availability. Up until now, fake base stations have been required to execute such attacks. Since they require a continuously high output power to attract victims, they are limited in range and can be easily detected both by operators and dedicated apps on users' smartphones. This paper introduces AdaptOver ...Working Paper -
MOBIS-COVID19/86
(2022)Arbeitsberichte Verkehrs- und RaumplanungOn March 16, 2020, 3700 participants who completed the MOBIS study between September 2019 and January 2020 were invited to reinstall the GPS Logger and Travel Diary App ‘Catch-My-Day’, developed by MotionTag, to record their mobility behaviour during the period of special measures implemented to control the spread of the Corona Virus. The first 4 weeks of mobility data from the original MOBIS Study is taken for each participant as a ...Report -
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Sample Complexity and Overparameterization Bounds for Temporal Difference Learning with Neural Network Approximation
(2021)arXivIn this paper, we study the dynamics of temporal difference learning with neural network-based value function approximation over a general state space, namely, \emph{Neural TD learning}. We consider two practically used algorithms, projection-free and max-norm regularized Neural TD learning, and establish the first convergence bounds for these algorithms. An interesting observation from our results is that max-norm regularization can ...Working Paper -
Linear Convergence of Entropy-Regularized Natural Policy Gradient with Linear Function Approximation
(2022)arXivNatural policy gradient (NPG) methods with entropy regularization achieve impressive empirical success in reinforcement learning problems with large state-action spaces. However, their convergence properties and the impact of entropy regularization remain elusive in the function approximation regime. In this paper, we establish finite-time convergence analyses of entropy-regularized NPG with linear function approximation under softmax ...Working Paper -
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Technologische Weiterentwicklung des Bahnsystems 2050
(2022)Die Bahn ist ein Verkehrssystem, welches unter anderem die Eigenschaften hat, sehr energieeffizient und sehr raumeffizient, sehr hohe Transportleistungen zu erbringen. Durch die zukünftigen gesellschaftlichen Herausforderungen, wie der Klimawandel, die Nachhaltigkeitsziele, die zunehmende Ressourcenknappheit, die Wirtschaftlichkeit und der immer knapper werdende Raum in der Schweiz, werden diese Eigenschaften des Bahnsystems immer wichtiger. ...Report -
European Aerosol Phenomenology − 8: Harmonised Source Apportionment of Organic Aerosol using 22 Year-long ACSM/AMS Datasets
(2022)arXivOrganic aerosol (OA) is a key component to total submicron particulate matter (PM1), and comprehensive knowledge of OA sources across Europe is crucial to mitigate PM1 levels. Europe has a well-established air quality research infrastructure from which yearlong datasets using 21 aerosol chemical speciation monitors (ACSMs) and 1 aerosol mass spectrometer (AMS) were gathered during 2013-2019. It includes 9 non-urban and 13 urban sites. ...Working Paper -
Interactive comment on “Commentary on ”Homogeneous nucleation of NAD and NAT in liquid stratospheric aerosols: insufficient to explain denitrification" by Knopf et al.” by A. Tabazadeh
(2003)Atmospheric Chemistry and Physics DiscussionsWorking Paper