Nonperturbative β function of twelve-flavor SU(3) gauge theory

Autor: Anna Hasenfratz, David Schaich

Publikováno v: Journal of High Energy Physics, Vol 2018, Iss 2, Pp 1-47 (2018)

Abstract We study the discrete β function of SU(3) gauge theory with N f = 12 massless fermions in the fundamental representation. Using an nHYP-smeared staggered lattice action and an improved gradient flow running coupling g˜c2L $$ {\tilde{g}}_c^

Externí odkaz: https://doaj.org/article/98a131703c75494495b28be8c6a3e5e1

Emergent strongly coupled ultraviolet fixed point in four dimensions with eight Kähler-Dirac fermions

Autor: ANNA HASENFRATZ

Publikováno v: Physical Review

The existence of a strongly coupled ultraviolet fixed point in four-dimensional lattice models as they cross into the conformal window has long been hypothesized. The SU(3) gauge system with eight fundamental fermions is a good candidate to study thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0729a93579b1959f3811047ee91b5e08
https://doi.org/10.1103/physrevd.106.014513

Stealth dark matter confinement transition and gravitational waves

Autor: Oliver Witzel, Anna Hasenfratz, Xiao-Yong Jin, Andrew D. Gasbarro, Ethan T. Neil, Richard C. Brower, Pavlos Vranas, Enrico Rinaldi, David Schaich, James C. Osborn, G. T. Fleming, Kimmy K. Cushman, Claudio Rebbi, Graham D. Kribs

Publikováno v: Brower, R. C.; Cushman, K.; Fleming, G. T.; Gasbarro, A.; Hasenfratz, A.; Jin, X. Y.; Kribs, G. D.; Neil, E. T.; Osborn, J. C.; Rebbi, C.; Rinaldi, E.; Schaich, D.; Vranas, P.; Witzel, O. (2021). Stealth dark matter confinement transition and gravitational waves. Physical review. D-particles, fields, gravitation, and cosmology, 103(1), 014505. American Physical Society 10.1103/PhysRevD.103.014505
PHYSICAL REVIEW D
Physical Review

We use non-perturbative lattice calculations to investigate the finite-temperature confinement transition of stealth dark matter, focusing on the regime in which this early-universe transition is first order and would generate a stochastic background

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::879740eee8e6a7660a260830355fbefa
https://boris.unibe.ch/151873/1/PhysRevD.103.014505.pdf

Continuous renormalization group $\beta$ function from lattice simulations

Autor: Oliver Witzel, Anna Hasenfratz

Publikováno v: Physical Review

We present a real-space renormalization group transformation with continuous scale change to calculate the continuous renormalization group $\beta$ function in non-perturbative lattice simulations. Our method is motivated by the connection between Wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6c0467052dde63708e502555063a4b6
http://repo.scoap3.org/api

Dislocations under gradient flow and their effect on the renormalized coupling

Autor: Oliver Witzel, Anna Hasenfratz

Publikováno v: Physical Review

Non-zero topological charge is prohibited in the chiral limit of gauge-fermion systems because any instanton would create a zero mode of the Dirac operator. On the lattice, however, the geometric $Q_\text{geom}=\langle F{\tilde F}\rangle /32\pi^2$ de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2ad20f27fd4b67f4de111a28bab4ded