Conformal windows beyond asymptotic freedom
نویسندگان
چکیده
We study four-dimensional gauge theories coupled to fermions in the fundamental and mesonlike scalars. All requisite beta functions are provided for general group fermion representation. In regime where asymptotic freedom is absent, we determine all interacting fixed points using perturbation theory up three loop two Yukawa quartic couplings. find that conformal window of ultraviolet narrowed down by finite-$N$ corrections beyond Veneziano limit. also a new infrared point whose main features, such as scaling exponents, UV-IR connecting trajectories, phase diagram, provided. Both collide upon varying number flavors ${N}_{\mathrm{f}}$, conformality lost through saddle-node bifurcation. further revisit prospect large-${N}_{\mathrm{f}}$ limit matter field fluctuations dominate. Unlike at weak coupling, do not clear evidence solutions even presence scalar
منابع مشابه
Asymptotic Freedom 1. Understanding Asymptotic Freedom in Qcd
I discuss how the basic phenomenon of asymptotic freedom in QCD can be understood in elementary physical terms. Similarly, I discuss how the long-predicted phenomenon of “gluonization of the proton” – recently spectacularly confirmed at HERA – is a rather direct manifestation of the physics of asymptotic freedom. I review the broader significance of asymptotic freedom in QCD in fundamental phys...
متن کاملConfinement versus asymptotic freedom
We put forward the low-energy confining asymptote of the solution < WC > (valid for large macroscopic contours C of the size >> 1/ΛQCD ) to the large N Loop equation in the D = 4 U(N) Yang-Mills theory with the asymptotic freedom in the ultraviolet domain. Adapting the multiscale decomposition characteristic of the Wilsonean renormgroup, the proposed Ansatz for the loop-average is composed in o...
متن کاملAsymptotic Freedom Cosmology
For a general class of scalar–tensor gravity theories, we discuss how to recover asymptotic freedom regimes when cosmic time t → ±∞. Such a feature means that the effective gravitational coupling Geff → 0, while cosmological solutions can asymptotically assume de Sitter or power–law behaviours. In our opinion, through this mechanism, it is possible to cure some shortcomings in inflationary and ...
متن کاملBeyond Freedom and Dignity
Almost all living things act to free themselves from harmful contacts. A kind of freedom is achieved by the relatively simple forms of behavior called reflexes. A person sneezes and frees his respiratory passages from irritating substances. He vomits and frees his stomach from indigestible or poisonous food. He pulls back his hand and frees it from a sharp or hot object. More elaborate forms of...
متن کاملAsymptotic freedom: history and interpretation
In this lecture, the early history of asymptotic freedom is discussed. The first completely correct derivation of β0 in non-abelian gauge theory (Khriplovich, 1969) was done in the Coulomb gauge; this derivation is reproduced (in modernized terms) in Sect. 2. A qualitative physical explanation of asymptotic freedom via chromomagnetic properties of vacuum (Nielsen, 1981) is discussed in Sect. 3.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.104.105002