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Nuclear Theory·nucl-th

Friday·November 8, 2024

12 papers—9 primary·3 cross-listed

All12Primary9Cross-lists3
  1. 10

    Parametrization of GPDs from t-channel string exchange in AdS spaces

    Kiminad A. Mamo🇺🇸 · Ismail Zahed🇺🇸

    We introduce a string-based parametrization for nucleon quark and gluon generalized parton distributions (GPDs) that is valid for all skewness. Our approach leverages conformal moments, representing them as the sum of spin-j nucleon A-form factor and skewness-dependent spin-j nucleon D-form factor, derived from t-channel string exchange in AdS spaces consistent with Lorentz invariance and unitarity. This model-independent framework, satisfying the polynomiality condition due to Lorentz invariance, uses Mellin moments from empirical data to estimate these form factors. With just five Regge slope parameters, our method accurately produces various nucleon quark GPD types and symmetric nucleon gluon GPDs through pertinent Mellin-Barnes integrals. Our isovector nucleon quark GPD is in agreement with existing lattice data, promising to improve the empirical extraction and global analysis of nucleon GPDs in exclusive processes, by avoiding the deconvolution problem at any skewness, for the first time.

    ↳ hep-phhep-lathep-thnucl-thPRL(2024)·20 citations
  2. 11

    Quantum Magic and Computational Complexity in the Neutrino Sector

    Ivan Chernyshev🇺🇸 · Caroline E. P. Robin🇩🇪 · Martin J. Savage🇺🇸

    We consider the quantum magic in systems of dense neutrinos undergoing coherent flavor transformations, relevant for supernova and neutron-star binary mergers. Mapping the three-flavor-neutrino system to qutrits, the evolution of quantum magic is explored in the single scattering angle limit for a selection of initial tensor-product pure states for neutrinos. For initial states, the magic, as measured by the stabilizer Renyi entropy , is found to decrease with radial distance from the neutrino sphere, reaching a value that lies below the maximum for tensor-product qutrit states. Further, the asymptotic magic per neutrino, , decreases with increasing . In contrast, the magic evolving from states containing all three flavors reaches values only possible with entanglement, with the asymptotic increasing with . These results highlight the connection between the complexity in simulating quantum physical systems and the parameters of the Standard Model.

    ↳ quant-phhep-phnucl-thPRResearch(2025)·60 citations
  3. 12

    Investigating the Seebeck effect of the QGP medium using a novel relaxation time approximation model

    Anowar Shaikh🇮🇳 · Shubhalaxmi Rath🇨🇱 · Sadhana Dash🇮🇳 · Binata Panda🇮🇳

    The highly energetic particle medium formed in the ultrarelativistic heavy ion collision displays a notable difference in the temperatures between its central and peripheral regions. This temperature gradient can generate an electric field within the medium, a phenomenon referred to as the Seebeck effect. We have estimated the Seebeck coefficient for a dense quark-gluon plasma medium by using the relativistic Boltzmann transport equation in the recently developed novel relaxation time approximation (RTA) model within the kinetic theory framework. This study explores the Seebeck coefficient of individual quark flavors as well as the entire partonic medium. Our observation indicates that, for given current quark masses, the magnitude of the Seebeck coefficient for each quark flavor as well as for the partonic medium decreases as the temperature rises and increases as the chemical potential increases. Furthermore, we have investigated the Seebeck effect by considering the partonic interactions within the quasiparticle model. In addition, we have presented a comparison between our findings and the results of the standard RTA model. We have observed that the Seebeck coefficient of the QGP medium gets conspicuously decreased in the novel RTA model as compared to that in the standard RTA model. A decreased Seebeck coefficient in the novel RTA model describes a smaller magnitude of induced electric field in the medium than that estimated by the standard RTA model. However, the rate of decline gets gradually smaller as the medium gets hotter for both the current quark mass scenario and the quasiparticle mass scenario. It is also found that, in the noninteracting case, the Seebeck coefficient possesses a slightly negative value in the high temperature region, unlike the quasiparticle description, where the Seebeck coefficient remains positive for the entire temperature range.

    ↳ hep-phhep-thnucl-thPRD(2025)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE