ELFT HÍRADÓ

[Somogyi Gábor <somogyi.gabor AT wigner.hun-ren.hu>]

Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk


        Bakar Chargeishvili
        (Institute for Theoretical Physics, Karlsruhe Institute of 
Technology)


"Precision, Precisely: From Theory to Computation in High-Order 
Calculations”


címmel tartandó szemináriumára.


Kivonat:



We spend years pushing theoretical precision - higher loop orders, 
careful scheme choices, refined PDFs - yet the question of whether we 
can actually evaluate the result reliably is often overlooked. Using pp 
-> ttH at two loops as a case study, I discuss what happens when 
carefully derived amplitudes meet computational reality.

I will begin with a pedagogical overview of High-Performance Computing 
concepts essential for modern physics calculations, including 
vectorization and GPU offloading. Following this, I will discuss the 
specific pitfalls of floating-point arithmetic in amplitude evaluation. 
Finally, I will describe a systematic effort - combining exhaustive 
worst-case search with modern verification and optimization techniques 
from computer science - to determine and minimize the actual error of 
the special functions underlying essentially any high-precision 
calculation. The measured worst cases of standard building blocks 
saturate the bounds proven in the literature, and re-engineered 
implementations achieve smaller errors at the same speed, outperforming 
standard mathematical libraries by up to an order of magnitude. The aim 
of the talk is to offer practical guidance for any high-precision 
calculation where reliability cannot be left to chance or to generic 
"arbitrary precision" libraries.




Helye: Wigner FK RMI II. ép. Médiaterem [SZOKÁSOSTÓL ELTÉRŐ HELYSZÍN]
Ideje: 2026 szeptember 25. péntek d.u. 14 óra

Szívesen látunk minden érdeklődőt.


                  Somogyi Gábor