Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Anders Tranberg"'
Autor:
Anders Tranberg, Gerhard Ungersbäck
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-30 (2024)
Abstract In certain models of inflation, the postinflationary reheating of the Universe is not primarily due to perturbative decay of the inflaton field into particles, but proceeds through a tachyonic instability. In the process, long-wavelength mod
Externí odkaz:
https://doaj.org/article/e7fb95885d714384a447f8c71ed62108
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 1, Pp 1-27 (2024)
Abstract The physics of individual Q-balls and interactions between multiple Q-balls are well-studied in classical numerical simulations. Interesting properties and phenomena have been discovered, involving stability, forces, collisions and swapping
Externí odkaz:
https://doaj.org/article/d778c8cbc2404e00ae590f63ed1d7e82
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 10, Pp 1-23 (2022)
Abstract We apply the Generalised Thimble approach to the computation of exact path integrals and correlators in real-time quantum field theory. We first investigate the details of the numerical implementation and ways of optimizing the algorithm. We
Externí odkaz:
https://doaj.org/article/e274a69831bc4210a49df0b1e630657e
Autor:
Anders Tranberg, Gerhard Ungersbäck
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 9, Pp 1-28 (2022)
Abstract Classical-statistical lattice simulations provide a useful approximation to out-of-equilibrium quantum field theory, but only for systems exhibiting large occupation numbers, and only for phenomena that are not intrinsically quantum mechanic
Externí odkaz:
https://doaj.org/article/00acda6e1b33481abcd1fe29d4d4a9a0
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 2, Pp 1-35 (2022)
Abstract The non-linear dynamics of long-wavelength cosmological fluctuations may be phrased in terms of an effective classical, but stochastic evolution equation. The stochastic noise represents short-wavelength modes that continually redshift into
Externí odkaz:
https://doaj.org/article/0ab30ea9ed1449f6b6acc5edf66cddf5
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 4, Pp 1-28 (2021)
Abstract Inflation is often described through the dynamics of a scalar field, slow-rolling in a suitable potential. Ultimately, this inflaton must be identified with the expectation value of a quantum field, evolving in a quantum effective potential.
Externí odkaz:
https://doaj.org/article/a8e5c0636717408187260134b023288b
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 3, Pp 1-22 (2021)
Abstract Inspired by Lefschetz thimble theory, we treat Quantum Field Theory as a statistical theory with a complex Probability Distribution Function (PDF). Such complex-valued PDFs permit the violation of Bell-type inequalities, which cannot be viol
Externí odkaz:
https://doaj.org/article/6311e62d5ff4481b836bc04d8f1f96f9
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 11, Pp 1-20 (2019)
Abstract We follow up the work, where in light of the Picard-Lefschetz thimble approach, we split up the real-time path integral into two parts: the initial density matrix part which can be represented via an ensemble of initial conditions, and the d
Externí odkaz:
https://doaj.org/article/6946585a563f4464bfcd6f7256619fdc
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 6, Pp 1-34 (2019)
Abstract Direct numerical evaluation of the real-time path integral has a well-known sign problem that makes convergence exponentially slow. One promising remedy is to use Picard-Lefschetz theory to flow the domain of the field variables into the com
Externí odkaz:
https://doaj.org/article/cee8d0c1e64242fcb68e80958971ef0e
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 5, Pp 1-17 (2018)
Abstract We compute the baryon asymmetry created in a tachyonic electroweak symmetry breaking transition, focusing on the dependence on the source of effective CP-violation. Earlier simulations of Cold Electroweak Baryogenesis have almost exclusively
Externí odkaz:
https://doaj.org/article/d8de183f480046b78e272f03129da702