2024/03/08 by Shivam Singh Kushwah, Kushwah, Shivam Singh, Aalok Misra +1 · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · Neuroscience · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Lipid Membrane Structure and Behavior #Molecular spectroscopy and chirality #Photoreceptor and optogenetics research
paper · pdf · doi:10.48550/arxiv.2403.10541
openalex publication_date 2024/03/08 · openalex created_date 2024/03/20 · openalex updated_date 2026/07/28
In the context of strongly coupled thermal QCD-like theories, the bulk viscosity(ζ)-to-shear viscosity(η) ratio using the type IIA-theory dual of thermal QCD-like theories was shown to vary like (1)/(3) - cs2 (arXiv:1807.04713) (cs being the speed of sound), and the same (\fracζη) at weak coupling using kinetic theory and finite temperature field theory, was shown and is known to vary like ((1)/(3) - cs2)2 (arXiv:1807.04713). The novelties of the results of this paper are that we not only show for the first time from \cal M theory that at intermediate coupling, with the inclusion of the \cal O(R4) corrections, the result obtained for \fracζη interpolates between the strong and weak coupling results in a way consistent with lattice computations of SU(3) Gluodynamics (arXiv:0710.3717 [hep-lat]) within statistical errors (and within the temperature range permissible by our \cal M-theory uplift), but also observe that this behavior is related to the existence of Contact 3-Structures that exist only at intermediate coupling effected by the intermediate-N "MQGP" limit of (arXiv:2211.13186[hep-th]). We also obtain an explicit dependence of \fracζη on (fractional powers of) the temperature-dependent/running gauge coupling (and its temperature derivative), and verify that the weak-coupling result dominates at large temperatures. We further conjecture that the aforementioned fractional-power-dependence of \fracζη on the gauge coupling is related to the lack of ``N-connectedness'' in the parameter space of Contact 3-Structures (as shown in arXiv:2211.13186[hep-th]).