Tootfinder

Equivalence of two component spinor mechanism and four component spinor mechanism in top quark pair production
Malvika Deo, Anuradha Misra, Sharada Subramanian, Radhika Vinze
https://arxiv.org/abs/2506.09094

Equivalence of two component spinor mechanism and four component spinor mechanism in top quark pair production
We calculate the $S$-matrix elements for the process $e^{+} e^{-}\rightarrow t \bar{t}$ mediated by SM photon, $Z$ boson and an additional $Z^{'}$ boson indicating the contribution from new physics. We calculate the amplitude square using two component spinor formalism and four component spinor formalism and show the equivalance of the results using the two formalisms. We also establish the relations between the couplings of $Z^{'}$ boson to fermions in the two component spinor formalism and in…

Inertia Tames Fluctuations in Autonomous Stationary Heat Engines
Enrique P. Cital, Viktor Holubec
https://arxiv.org/abs/2508.12936 https://arxiv.org/pdf/25…

Inertia Tames Fluctuations in Autonomous Stationary Heat Engines
Thermodynamic uncertainty relations (TURs) provide fundamental constraints on the interplay between power fluctuations, entropy production, and efficiency in overdamped stationary autonomous heat engines. However, their validity in underdamped regimes remains limited and less explored. Here, we analytically and numerically study a physically realizable autonomous heat engine composed of two underdamped continuous degrees of freedom coupled to a two-level system. We show that this nonlinear setu…