Zobrazeno 1 - 10
of 179
pro vyhledávání: '"Josif Frenkel"'
Autor:
Josif Frenkel
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
Limite de Bjorken e comutadores a tempos iguais Bjorken limit and equal-time switches
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::365ac130307f6909fff6c6fb95cb67ed
https://doi.org/10.11606/d.43.1970.tde-29082022-142406
https://doi.org/10.11606/d.43.1970.tde-29082022-142406
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The dimensionful nature of the coupling in the Einstein-Hilbert action in four dimensions implies that the theory is non-renormalizable; explicit calculation shows that beginning at two loop order, divergences arise that cannot be removed by renormal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cde4e4380232fe1b1e856bba9f3ce951
https://doi.org/10.1139/cjp-2019-0037
https://doi.org/10.1139/cjp-2019-0037
Publikováno v:
Physical Review
We study, in the imaginary time formalism, the relation between loops and on-shell forward scattering tree amplitudes in thermal field theories. This allows for an efficient evaluation, at all temperatures, of Green's functions with causal retarded b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7d2fb0133094ef0e798eb6cb4158046
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
We study the Yang-Mills theory and quantum gravity at finite temperature, in the presence of Lagrange multiplier fields. These restrict the path integrals to field configurations which obey the classical equations of motion. This has the effect of do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82e9d34a79a23dda86e5da549b3dfa88
Autor:
Josif Frenkel, André Luiz Moura Britto
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
No âmbito da teoria quântica de campos (TQC) foram estudados modelos de quench exatamente solúveis. Nestes modelos, obteve-se uma generalização do ansatz de Kadanoff-Baym que se mantém em todos intervalos de tempo. Algumas hipóteses sobre fen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a793fa97e3f4561487a376a954cba931
https://doi.org/10.11606/t.43.2019.tde-28012019-171710
https://doi.org/10.11606/t.43.2019.tde-28012019-171710
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Physical Review
Universidade de São Paulo (USP)
instacron:USP
Physical Review
We study the self-consistency of the first order formulation of quantum gravity, which may be attained by introducing, apart from the graviton field, another auxiliary quantum field. By comparing the forms of the generating functional $Z$ before and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b6d54f30a711dd4102e3eeb7cef45ff
Publikováno v:
Physical Review
We examine the self-consistency of the first-order formulation of the Yang-Mills theory. By comparing the generating functional $Z$ before and after integrating out the additional field $F^a_{\mu\nu}$, we derive a set of structural identities that mu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9c9d79524cb24542f98fac670331bf8
Autor:
Josif Frenkel, John Taylor
Publikováno v:
Annals of Physics. 389:234-238
We show how the BRST identities can be used to control the renormalization of the background gauge in QCD, in spite of the fact that certain one-particle reducible graphs have to be omitted in general. We obtain the all order renormalized effective a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7cefd1744ba0efd6bf23f2aef76e9b1f
https://doi.org/10.1016/j.aop.2017.12.014
https://doi.org/10.1016/j.aop.2017.12.014
Publikováno v:
Annals of Physics. 434:168659
Quantizing any model in which a Lagrange multiplier (LM) field is used to restrict field configurations to those that satisfy the classical equations of motion, leads to at most one-loop radiative corrections. This approach can be used with both the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::81591daed2c96dbe3548ecb245bf46d2
https://doi.org/10.1016/j.aop.2021.168659
https://doi.org/10.1016/j.aop.2021.168659
Publikováno v:
Physical Review
The problem of eliminating divergences arising in quantum gravity is generally addressed by modifying the classical Einstein-Hilbert action. These modifications might involve the introduction of local supersymmetry, the addition of terms that are hig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35a8145c705a8204beb8d64ad743c931
http://arxiv.org/abs/1901.10273
http://arxiv.org/abs/1901.10273