Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Gabriele Spada"'
Autor:
Giacomo Sberveglieri, Gabriele Spada
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 5, Pp 1-29 (2024)
Abstract Scalar field theories with quartic interactions are of central interest in the study of second-order phase transitions. For three-dimensional theories, numerous studies make use of the fixed-dimensional perturbative computation of [B. Nickel
Externí odkaz:
https://doaj.org/article/82917fa0d4ae41ebaea6f98d550ddc82
Publikováno v:
SciPost Physics, Vol 15, Iss 4, p 171 (2023)
We investigate the magnetic behavior of finite-temperature repulsive two-component Bose mixtures by means of exact path-integral Monte-Carlo simulations. Novel algorithms are implemented for the free energy and the chemical potential of the two compo
Externí odkaz:
https://doaj.org/article/0faad69bce3349dfa9cb72644f7e45f9
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 2, Pp 1-37 (2021)
Abstract In the classically unbroken phase, 3d O(N) symmetric ϕ 4 vector models admit two equivalent descriptions connected by a strong-weak duality closely related to the one found by Chang and Magruder long ago. We determine the exact analytic ren
Externí odkaz:
https://doaj.org/article/73ba89f9ce474348b097096548081b24
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-36 (2019)
Abstract We extend the study of the two-dimensional euclidean ϕ 4 theory initiated in ref. [1] to the ℤ2 broken phase. In particular, we compute in perturbation theory up to N4LO in the quartic coupling the vacuum energy, the vacuum expectation va
Externí odkaz:
https://doaj.org/article/693e1688b5c04de3902b80185658fc51
Publikováno v:
Condensed Matter, Vol 7, Iss 2, p 30 (2022)
We provide a detailed description of the path-integral Monte Carlo worm algorithm used to exactly calculate the thermodynamics of Bose systems in the canonical ensemble. The algorithm is fully consistent with periodic boundary conditions, which are a
Externí odkaz:
https://doaj.org/article/0cd4a844e480414c84ed7e6a5874b8d6
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 8, Pp 1-35 (2018)
Abstract Perturbation theory of a large class of scalar field theories in d < 4 can be shown to be Borel resummable using arguments based on Lefschetz thimbles. As an example we study in detail the λϕ 4 theory in two dimensions in the Z 2 symmetric
Externí odkaz:
https://doaj.org/article/64e3617f32844cc4bed81b1e30330163
Publikováno v:
Journal of High Energy Physics, Vol 2017, Iss 5, Pp 1-41 (2017)
Abstract We study quantum mechanical systems with a discrete spectrum. We show that the asymptotic series associated to certain paths of steepest-descent (Lefschetz thimbles) are Borel resummable to the full result. Using a geometrical approach based
Externí odkaz:
https://doaj.org/article/cb2b379bef2c487ca4cda670127f650e
Publikováno v:
Physical Review A. 106
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::099240bec5b18de877ea35da54c6354d
https://doi.org/10.1103/physreva.106.069902
https://doi.org/10.1103/physreva.106.069902
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-36 (2019)
Journal of High Energy Physics
Journal of High Energy Physics
We extend the study of the two-dimensional euclidean ϕ 4 theory initiated in ref. [1] to the ℤ2 broken phase. In particular, we compute in perturbation theory up to N4LO in the quartic coupling the vacuum energy, the vacuum expectation value of ϕ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7535fc2f734b2cf2bf10b64d355e984
http://link.springer.com/article/10.1007/JHEP05(2019)047
http://link.springer.com/article/10.1007/JHEP05(2019)047
We present precise path-integral Monte-Carlo results for the thermodynamics of a homogeneous dilute Bose gas. Pressure and energy are calculated as a function of temperature both below and above the Bose-Einstein transition. Specifically, we address
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f0ff4cae73815f0155c85179a5c59db
