Modern Feynman Diagrammatic One-Loop Calculations

In this talk we present techniques for calculating one-loop amplitudes for multi-leg processes using Feynman diagrammatic methods in a semi-algebraic context. Our approach combines the advantages of the different methods allowing for a fast evaluation of the amplitude while monitoring the numerical stability of the calculation. In phase space regions close to singular kinematics we use a method avoiding spurious Gram determinants in the calculation. As an application of our approach we report on the status of the calculation of the amplitude for the process $pp\to b\bar{b}b\bar{b}+X$.Comment: 10 pages, 2 figures; contribution to the proceedings of the CPP2010 Workshop, 23-25 Sep. 2010, KEK, Tsukuba, Japa

Recent Progress in the Golem Project

We report on the current status of the Golem project which aims at the construction of a general one-loop evaluator for matrix elements. We construct the one-loop matrix elements from Feynman diagrams in a highly automated way and provide a library for the reduction and numerically stable evaluation of the tensor integrals involved in this approach. Furthermore, we present applications to physics processes relevant for the LHC.Comment: 7 pages, 4 figures, contrib. to proceedings of "Loops and Legs in Quantum Field Theory", 10th DESY Workshop on Elementary Particle Theory, 25-30 April 2010, Woerlitz, German

Power to youth: Designing democracy for long-term well-being

Democratic processes may not take the welfare of future generations sufficiently into account and thus may not achieve sustainability. We introduce rejection/support rewards (RSRs) and show that a dual democratic mechanism-RSRs and elections-can achieve sustainability. RSRs stipulate that incumbents who are not re-elected, but obtain the majority support among young voters, receive a particular monetary or non-monetary reward. Such rejection/support rewards induce politicians to undertake long-term beneficial policies, but may invite excessive reward-seeking. We identify optimal RSRs under different informational circumstances.Democracy Elections Incentive contracts Sustainability Rejection/support rewards

Designing Democracies for Sustainability

Democratic processes may not take the welfare of future generations sufficiently into account and thus may not achieve sustainability. We show that the dual democratic mechanism – rejection/support rewards (RSRs) for politicians and elections – can achieve sustainability. RSRs stipulate that incumbents who are not re-elected, but obtain the majority support among young voters receive a particular monetary or non-monetary reward. Such rejection/support rewards induce politicians to undertake long-term beneficial policies, but may invite excessive reward-seeking. We identify optimal RSRs under different informational circumstances.democracy; elections; incentive contracts; Q56; rejection/support rewards; sustainability

Cybercolonialism and Citizenship

Tuzcu P, Kleinschmidt M, Natarajan R. Cybercolonialism and Citizenship. In: Supik L, Kleinschmidt M, Natarajan R, et al., eds. Gender, Race and Inclusive Citizenship. Dialoge zwischen Aktivismus und Wissenschaft. 1st ed. Wiesbaden: Springer; 2022: 431–448.After digitalisation was seen as a great opportunity for the emancipation of subjects in the 1990s and early 2000s (Block and Dickel 2020), it has become increasingly apparent in recent years that even supposedly neutral algorithms perpetuate and reinforce social inequalities, e.g. with regard to race and gender. Thus, the continuity of colonial discourse is becoming the focus of the debate on these processes. In conversation with Radhika Natarajan and Malte Kleinschmidt, Pinar Tuzcu explains how colonialism is reproduced in the digital world, and discusses political strategies to address this issue

Monolingual Citizenship? Unequal Multilingualisms and Ambiguous Acts

Ní Mhurchú A, Natarajan R, Kleinschmidt M. Monolingual Citizenship? Unequal Multilingualisms and Ambiguous Acts. In: Supik L, Kleinschmidt M, Natarajan R, et al., eds. Gender, Race and Inclusive Citizenship. Dialoge zwischen Aktivismus und Wissenschaft. 1st ed. Wiesbaden: Springer; 2022: 315–350.Aoileann Ní Mhurchú and Radhika Natarajan discuss vibrant issues of mono- and multilingualisms in terms of how certain language regimes are linked to a system of belonging in nation states. These regimes are challenged by the practice of migrant or alleged migrant communities. Focusing on the fields of education and cultural practice, both provide deep insights into the contexts of—among others— relationships with indigenous language in Ireland, the German education system in school and adult education, language mixing in Germany and Tamil-speaking women in Germany. Despite the range of contexts analysed, both agree and complement each other, theorising language as highly political and connected to questions of power, belonging and acts. The latter is analysed in its multi-faceted forms, avoiding simplistic binaries, and instead taking into account language practice and policies in their ambiguities and contradictions

Gender, Race and Inclusive Citizenship. Dialoge zwischen Aktivismus und Wissenschaft

Supik L, Kleinschmidt M, Natarajan R, et al., eds. Gender, Race and Inclusive Citizenship. Dialoge zwischen Aktivismus und Wissenschaft. 1st ed. Wiesbaden: Springer; 2022