Zobrazeno 1 - 10
of 293
pro vyhledávání: '"Rothkopf Alexander"'
We present a novel solution procedure for initial boundary value problems. The procedure is based on an action principle, in which coordinate maps are included as dynamical degrees of freedom. This reparametrization invariant action is formulated in
Externí odkaz:
http://arxiv.org/abs/2404.18676
Autor:
Parkar Gaurang, Bala Dibyendu, Kaczmarek Olaf, Larsen Rasmus, Mukherjee Swagato, Petreczky Peter, Rothkopf Alexander, Heinrich Weber Johannes
Publikováno v:
EPJ Web of Conferences, Vol 274, p 04006 (2022)
We present results on the in-medium interactions of static quark antiquark pairs using realistic 2+1 HISQ flavor lattice QCD. Focus is put on the extraction of spectral information from Wilson line correlators in Coulomb gauge using four complementar
Externí odkaz:
https://doaj.org/article/3e98d333abff49d68f5939d2b960fc93
Autor:
Rothkopf Alexander
Publikováno v:
EPJ Web of Conferences, Vol 274, p 01004 (2022)
The determination of real-time dynamics of strongly coupled quantum fields is a central goal of modern nuclear and particle physics, which requires insight into quantum field theory beyond the weak-coupling approximation. While lattice QCD has provid
Externí odkaz:
https://doaj.org/article/a66bf2ddbe5e4171accead617676c966
Publikováno v:
EPJ Web of Conferences, Vol 274, p 04015 (2022)
We introduce a method for reducing anisotropic heavy-quark potentials to isotropic potentials by using an effective screening mass that depends on the quantum numbers l and m of a given state. We demonstrate that, using the resulting 1D effective pot
Externí odkaz:
https://doaj.org/article/030990e57d31473a8aa628a3349c7b29
Publikováno v:
EPJ Web of Conferences, Vol 274, p 08001 (2022)
This study explores the utility of a kernel in complex Langevin simulations of quantum real-time dynamics on the Schwinger-Keldysh contour. We give several examples where we use a systematic scheme to find kernels that restore correct convergence of
Externí odkaz:
https://doaj.org/article/115338dec88340ee836aaff3ba9973b0
Autor:
Kim, Seyong, Rothkopf, Alexander
We construct a discrete non-hermitean momentum operator, which implements faithfully the non self-adjoint nature of momentum for a particle in a box. Its eigenfunctions are strictly limited to the interior of the box in the continuum limit, with the
Externí odkaz:
http://arxiv.org/abs/2403.13558
We re-investigate the interactions between static color sources in a finite temperature gluonic medium using both high resolution isotropic and anisotropic quenched lattice QCD ensembles. The underlying ill-posed inverse problem, related to the extra
Externí odkaz:
http://arxiv.org/abs/2402.10819
Autor:
Rothkopf, Alexander, Nordström, Jan
In a recently developed variational discretization scheme for second order initial value problems ( J. Comput. Phys. 498, 112652 (2024) ), it was shown that the Noether charge associated with time translation symmetry is exactly preserved in the inte
Externí odkaz:
http://arxiv.org/abs/2312.09772
We present a simulation strategy for the real-time dynamics of quantum fields, inspired by reinforcement learning. It builds on the complex Langevin approach, which it amends with system specific prior information, a necessary prerequisite to overcom
Externí odkaz:
http://arxiv.org/abs/2310.08053
Autor:
Bazavov, Alexei, Hoying, Daniel, Larsen, Rasmus N., Mukherjee, Swagato, Petreczky, Peter, Rothkopf, Alexander, Weber, Johannes Heinrich
Publikováno v:
Physical Review D 109, 074504 (2024)
We study the correlator of temporal Wilson lines at non-zero temperature in 2+1 flavor lattice QCD with the aim to define the heavy quark-antiquark potential at non-zero temperature. For temperatures $153~{\rm MeV} \leq T \leq 352~{\rm MeV}$ the spec
Externí odkaz:
http://arxiv.org/abs/2308.16587