Zobrazeno 1 - 10
of 723
pro vyhledávání: '"PICKERING, D."'
Publikováno v:
Phys. Rev. D 99, 074002 (2019)
Techniques based on $n$-particle irreducible effective actions can be used to study systems where perturbation theory does not apply. The main advantage, relative to other non-perturbative continuum methods, is that the hierarchy of integral equation
Externí odkaz:
http://arxiv.org/abs/1901.00840
Autor:
Carrington, M. E., Friesen, S. A., Meggison, B. A., Phillips, C. D., Pickering, D., Sohrabi, K.
Publikováno v:
Phys. Rev. D 97, 036005 (2018)
We consider a symmetric scalar theory with quartic coupling in 4-dimensions. We show that the 4 loop 2PI calculation can be done using a renormalization group method. The calculation involves one bare coupling constant which is introduced at the leve
Externí odkaz:
http://arxiv.org/abs/1711.09135
Publikováno v:
In Internet Interventions March 2022 27
Publikováno v:
Phys. Rev. D 94, 025018 (2016)
It is well known that perturbative pressure calculations show poor convergence. Calculations using a two particle irreducible (2PI) effective action show improved convergence at the 3 loop level, but no calculations have been done at 4 loops. We cons
Externí odkaz:
http://arxiv.org/abs/1603.02085
Publikováno v:
Phys. Rev. D 91, 025003 (2015)
We consider a symmetric scalar theory with quartic coupling in 4-dimensions and compare the standard 2PI calculation with a modified version which uses a functional renormalization group method. The set of integral differential equations that are obt
Externí odkaz:
http://arxiv.org/abs/1404.0710
Publikováno v:
Phys. Rev. D 89, 025013 (2014)
We consider a symmetric scalar theory with quartic coupling in 2- and 3-dimensions and compare the self-consistent 4-point vertex obtained from the 4PI effective action with the Bethe-Salpeter 4-vertex from 2PI effective action. At zero external mome
Externí odkaz:
http://arxiv.org/abs/1310.4352
In this paper we derive a hierarchy of integral equations from the 4PI effective action which have the form of Bethe-Salpeter equations. We show that, together with the equation of motion for the self-consistent 4-vertex, these integral equations are
Externí odkaz:
http://arxiv.org/abs/1310.3295
Publikováno v:
Phys.Rev.D78:045018,2008
The calculation of the real part of a quasi-particle dispersion relation at next-to-leading order in the hard thermal loop effective theory is a very difficult problem. Even though the hard thermal loop effective theory is almost 20 years old, there
Externí odkaz:
http://arxiv.org/abs/0805.0170
Publikováno v:
Eur.Phys.J.C50:711-727,2007
We have written a {\it Mathematica} program that calculates the integrand corresponding to any amplitude in the closed-time-path formulation of real time statistical field theory. The program is designed so that it can be used by someone with no prev
Externí odkaz:
http://arxiv.org/abs/hep-ph/0608298
Autor:
Choy, K., Kruk, T., Carrington, M. E., Fugleberg, T., Zahn, J., Kobes, R., Kunstatter, G., Pickering, D.
Publikováno v:
Phys.Rev. D73 (2006) 104011
We present the results of an analysis of superradiant energy flow due to scalar fields incident on an acoustic black hole. In addition to providing independent confirmation of the recent results in [5], we determine in detail the profile of energy fl
Externí odkaz:
http://arxiv.org/abs/gr-qc/0505163