BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Axions\, topology and electromagnetic fields on Lattice QCD DTSTART;VALUE=DATE-TIME:20230210T061500Z DTEND;VALUE=DATE-TIME:20230210T063000Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-810@events.vecc.gov.in DESCRIPTION:Speakers: José Javier Hernández Hernández (Bielefeld Univer sity)\nThe QCD vacuum is known to have a rich structure with non-trivial t opologies. These can be classified with the topological charge\, whose sec ond moment can be shown to be related to the mass of the axion. It is also of interest the introduction of non-perpendicular electric and magnetic f ields in QCD\, which enhances the weight of non-zero topological sectors. For weak electromagnetic fields the topological charge becomes proportiona l to $\\vec{E}\\cdot\\vec{B}$ and the proportionality factor is the QCD co ntribution to the axion-photon coupling. We use Lattice QCD simulations wi th improved staggered quarks and background electromagnetic fields to comp ute at finite lattice spacing the QCD contribution to the axion-photon cou pling\, as well as the dependance of the axion mass with temperature and t he magnetic field.\n\nhttps://events.vecc.gov.in/event/19/contributions/81 0/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/810/ END:VEVENT BEGIN:VEVENT SUMMARY:Higher-order quark and gluon propagators in thermal medium DTSTART;VALUE=DATE-TIME:20230210T071500Z DTEND;VALUE=DATE-TIME:20230210T073000Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-873@events.vecc.gov.in DESCRIPTION:Speakers: Najmul Haque (NISER\, India)\nBare perturbative resu lts at finite temperatures have some serious problems\, infrared sensitivi ty of the massless gauge theories\, gauge-dependent damping rates\, etc. A dditionally\, QCD thermodynamics are poorly convergent if truncated order- by-order in the coupling constant. To overcome these problems\, Braaten an d Pisarski proposed a gauge invariant reorganization of the usual perturba tion theory at the finite temperature where higher order diagrams contribu te to the lower order one. This is known as HTL perturbation theory. \n\nH TL perturbation theory is a gauge-invariant reorganization of the usual pe rturbation theory at the finite temperature and chemical potential where h igher-order diagrams contribute to the lower order. HTL is formulated cons idering one-loop quark and gluon self-energy\, and one replaces all the ba re N-point functions with the HTL resummed one to study any observables. H TL perturbation theory successfully studies the various properties of quar ks and gluon in a thermal medium. One such study is the QCD thermodynamics \, and it was calculated to the highest possible loop order. People have p ut very less effort into formulating the HTL in NLO order. Recently\, we h ave studied the quark propagator up to the next-to-leading order. In this talk\, I will discuss the computation of the quarks and gluons self-energi es and propagators to NLO in perturbation theory.\n\nhttps://events.vecc.g ov.in/event/19/contributions/873/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/873/ END:VEVENT BEGIN:VEVENT SUMMARY:Lattice approach to inhomogeneous magnetic fields as probes of QCD thermodynamics DTSTART;VALUE=DATE-TIME:20230210T070000Z DTEND;VALUE=DATE-TIME:20230210T071500Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-817@events.vecc.gov.in DESCRIPTION:Speakers: Adeilton Dean Marques Valois (Bielefeld University)\ nStrong magnetic fields occur across the universe in several physical\nsys tems. This is the case for magnetars\, heavy-ion collisions and the\nprimo rdial universe. These fields are strong enough to have an impact\non the i nteractions at the QCD scale. In this work\, we applied lattice\nQCD simul ations to gain new insights into how QCD thermodynamics\nis affected by th e presence of a background magnetic field. We\nsimulated 2 + 1 flavors of staggered quarks with physical masses and considered\nboth uniform and non -uniform magnetic fields to study the effect of\nsuch backgrounds on a ser ies of QCD observables. In particular\, we focus\non the phase diagram\, s teady currents and the magnetic susceptibility.\n\nhttps://events.vecc.gov .in/event/19/contributions/817/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/817/ END:VEVENT BEGIN:VEVENT SUMMARY:Eigenvalue spectrum of 2+1 flavor QCD using highly improved stagge red quarks DTSTART;VALUE=DATE-TIME:20230210T063000Z DTEND;VALUE=DATE-TIME:20230210T064500Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-826@events.vecc.gov.in DESCRIPTION:Speakers: Ravi Shanker (The Institute of Mathematical Sciences )\nThe transition from hadron to the quark-gluon plasma phase is a smooth crossover in QCD with physical quark masses\, nevertheless\, the (almost) chiral nature of the light quarks is believed to drive such a transition. This phenomenon can be studied using lattice QCD techniques and the most p opularly used fermion discretization\, the staggered fermions only have a remnant of the full chiral symmetry of QCD\, which is (perturbatively) bel ieved to be recovered in the continuum limit. We for the first time study the eigenvalue distribution of the QCD Dirac operator with highly improved staggered quark discretization as a function of three different lattice s pacings across the crossover transition temperature $T_c$\, and perform th e continuum extrapolation. From the features of the eigenvalue spectrum\, we can conclude that though the flavor non-singlet part of the chiral symm etry is restored above $T_c$ the flavor singlet $U_A(1)$ part of it remain s broken. Moreover\, we observe a level repulsion between the infrared eig envalues is quadratic to the spacing similar to the Gaussian unitary ensem ble(GuE) of chiral random matrix theory\, unlike the near-zero modes. The consequences of these findings will be discussed.\n\nhttps://events.vecc.g ov.in/event/19/contributions/826/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/826/ END:VEVENT BEGIN:VEVENT SUMMARY:Understanding the topological constituents of SU(3) gauge theory a cross the deconfinement transition DTSTART;VALUE=DATE-TIME:20230210T064500Z DTEND;VALUE=DATE-TIME:20230210T070000Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-808@events.vecc.gov.in DESCRIPTION:Speakers: sumit shaw (IMSc)\nFor $SU(N_c)$ gauge theories ther e is a first-order phase transition for $N_c \\ge 3$\, which signals the d econfinement of the color degrees of freedom at temperature $T_d$. However \, its mechanism is not yet understood but is believed to be of topologica l origin. In this work we measure the topological constituents of $SU(3)$ gauge theory configurations generated using lattice techniques for differe nt volumes and lattice spacings\, using the overlap Dirac operator zero mo des since it has exact chiral symmetry and an index theorem on the lattice . We focus on a temperature range from 0.9 to 1.5 $T_d$\, where the Polyak ov loop has non-trivial holonomy to understand the specific nature of thes e constituents\, particularly instanton-dyons. We measure the average dist ance between the instanton-dyons and their correlations with the Polyakov loop. Furthermore\, we measure the topological susceptibility and its high er moments using the Wilson flow technique which may allow us to isolate t he contribution of the instanton-dyons towards driving (de)confinement.\n\ nhttps://events.vecc.gov.in/event/19/contributions/808/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/808/ END:VEVENT BEGIN:VEVENT SUMMARY:Charm fluctuations in (2+1)-flavor QCD at high temperature DTSTART;VALUE=DATE-TIME:20230210T060000Z DTEND;VALUE=DATE-TIME:20230210T061500Z DTSTAMP;VALUE=DATE-TIME:20260813T092627Z UID:indico-contribution-107-779@events.vecc.gov.in DESCRIPTION:Speakers: Sipaz Sharma (Bielefeld University)\nUsing the high statistics datasets of the HotQCD Collaboration\,\ngenerated with the HISQ (2+1)-flavor action for light and strange quarks\, \nand treating the cha rm sector in the quenched approximation\, we analyze \nthe second and four th order cumulants of charm fluctuations and \nthe correlations of charm w ith lighter conserved flavor quantum numbers. \nWe can make use of a facto r 100 larger statistics on $N_\\tau =8$ lattices \nand datasets on lattice s with temporal extent $N_\\tau=12$ and $16$\, which \nnever have been use d in studies of charm fluctuations. This allows us to \nperform the contin uum limit for charm fluctuations in the quenched \napproximation. \n\nAnal yzing correlations of charm fluctuations with baryon number and \nelectric charge fluctuations we can project onto charmed baryon and \nmeson correl ations and compare results with quark model extended hadron \nresonance ga s model calculations. We aim at a precise determination of \nthe dissociat ion temperature of charmed hadrons and will probe the \nsensitivity of the fluctuations observables to the presence of \nmultiple-charmed baryons.\n \nhttps://events.vecc.gov.in/event/19/contributions/779/ LOCATION:Hall 1 (Sapphire) URL:https://events.vecc.gov.in/event/19/contributions/779/ END:VEVENT END:VCALENDAR