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P Schweitzer - One of the best experts on this subject based on the ideXlab platform.

  • energy momentum Tensor and the d term in the bag model
    Physical Review D, 2020
    Co-Authors: Matt J Neubelt, Andrew Sampino, Jonathan Hudson, Kemal Tezgin, P Schweitzer
    Abstract:

    The energy momentum Tensor (EMT) form factors pave new ways for exploring hadron structure. Especially, the D-term related to the EMT form factor D(t) has received a lot of attention due to its attractive physical interpretation in terms of mechanical properties. We study the nucleon EMT form factors and the associated densities in the bag model which we formulate for an arbitrary number of colors Nc and show that the EMT form factors are consistently described in this model in the large-Nc limit. The simplicity of the model allows us to test in a lucid way many theoretical concepts related to EMT form factors and densities including recently introduced concepts like normal and tangential forces, or monopole and quadrupole contributions to the angular momentum distribution. We also study the D-terms of the ρ-meson, Roper resonance, other N* states, and Δ-resonances. Among the most interesting outcomes is the lucid demonstration of the deeper connection of EMT conservation, stability, the virial theorem, and the negative sign of the D-term.

  • the energy momentum Tensor and d term of q clouds
    Nuclear Physics, 2016
    Co-Authors: Michael Cantara, Manuel Mai, P Schweitzer
    Abstract:

    Abstract The D-term is, like mass and spin, a fundamental property related to the Energy-Momentum Tensor. Yet it is not known experimentally for any particle. In all theoretical studies so far the D-terms of various particles were found negative. Early works gave rise to the assumption the negative sign could be related to stability. The emerging question is whether it is possible to find a field-theoretical system with a positive D-term. To shed some light on this question we investigate Q-clouds, an extreme parametric limit in the Q-ball system. Q-clouds are classically unstable solutions which delocalize, spread out over all space forming an infinitely dilute gas of free quanta, and are even energetically unstable against tunneling to plane waves. In short, these extremely unstable field configurations provide an ideal candidate system for our purposes. By studying the Energy-Momentum Tensor we show that at any stage of the Q-cloud limit one deals with perfectly well-defined and, when viewed in appropriately scaled coordinates, non-dissipating non-topological solitonic solutions. We investigate in detail their properties, and find new physical interpretations by observing that Q-clouds resemble BPS Skyrmions in certain aspects, and correspond to universal non-perturbative solutions in (complex) | Φ | 4 theory. In particular, we show that also Q-cloud solutions have negative D-terms. Our findings do not prove that D-terms must always be negative. But they indicate that it is unlikely to realize a positive D-term in a consistent physical system.

  • in medium modified energy momentum Tensor form factors of the nucleon within the framework of a π ρ ω soliton model
    Physical Review D, 2014
    Co-Authors: Juhyun Jung, Ulugbek Yakhshiev, Hyunchul Kim, P Schweitzer
    Abstract:

    We investigate the Energy-Momentum Tensor form factors of the nucleon in a nuclear medium, based on an in-medium modified $\ensuremath{\pi}$-$\ensuremath{\rho}$-$\ensuremath{\omega}$ soliton model, with medium modifications of the mesons considered. The results allow us to establish general features of medium modifications of the structure of nucleons bound in a nuclear medium.

  • energy momentum Tensor form factors of the nucleon in nuclear matter
    Physics Letters B, 2012
    Co-Authors: P Schweitzer, Hyunchul Kim, Ulugbek Yakhshiev
    Abstract:

    Abstract The nucleon form factors of the energy–momentum Tensor are studied in nuclear medium in the framework of the in-medium modified Skyrme model. We obtain a negative D-term, in agreement with results from other approaches, and find that medium effects make the value of d 1 more negative.

  • energy momentum Tensor and the d term of q balls
    Physical Review D, 2012
    Co-Authors: Manuel Mai, P Schweitzer
    Abstract:

    We study the Energy-Momentum Tensor of stable, meta-stable and unstable Q-balls in scalar field theories with U(1) symmetry. We calculate properties such as charge, mass, mean square radii and the constant d1 ("D-term") as functions of the phase space angular velocity omega. We discuss the limits when omega approaches the boundaries of the region in which solutions exist, and derive analytical results for the quantities in these limits. The central result of this work is the rigorous proof that d1 is strictly negative for all finite energy solutions in the Q-ball system. We also show that for Q-balls stability is a sufficient, but not necessary, condition for d1 to be negative.

D Urbano - One of the best experts on this subject based on the ideXlab platform.

Hiroshi Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • t to 0 extrapolation function in sf t x method for the energy momentum Tensor
    arXiv: High Energy Physics - Lattice, 2021
    Co-Authors: Hiroshi Suzuki, Hiromasa Takaura
    Abstract:

    We theoretically clarify the functional form to be used in $t \to 0$ extrapolation in the small flow time expansion (SF$t$X) method for the Energy-Momentum Tensor (EMT), which facilitates lattice simulation of the EMT based on the gradient flow. We argue that in the $t \to 0$ extrapolation analysis, lattice data should be fitted by a power function in $g(\mu(t))$, the flow time dependent running coupling, where the power is determined by the perturbation order we consider. From actual lattice data, we confirm the validity of the extrapolation function. Using the new extrapolation function, we present updated lattice results for thermodynamics quantities in quenched QCD; our results are consistent with the previous study [arXiv:1812.06444] but we obtain smaller errors due to reduction of systematic errors.

  • energy momentum Tensor correlation function in nf 2 1 full qcd at finite temperature
    35th International Symposium on Lattice Field Theory Lattice 2017, 2018
    Co-Authors: Yusuke Taniguchi, Hiroshi Suzuki, Shinji Ejiri, K Kanaya, Masakiyo Kitazawa, Asobu Suzuki, T Umeda
    Abstract:

    We measure correlation functions of the nonperturbatively renormalized Energy-Momentum Tensor in Nf = 2 + 1 full QCD at finite temperature by applying the gradient flow method both to the gauge and quark fields. Our main interest is to study the conservation law of the Energy-Momentum Tensor and to test whether the linear response relation is properly realized for the entropy density. By using the linear response relation we calculate the specific heat from the correlation function. We adopt the nonperturba-tively improved Wilson fermion and Iwasaki gauge action at a fine lattice spacing = 0:07 fm. In this paper the temperature is limited to a single value T ≃ 232 MeV. The u, d quark mass is rather heavy with m π =m ρ ≃ 0:63 while the s quark mass is set to approximately its physical value.

  • energy momentum Tensor on the lattice recent developments
    arXiv: High Energy Physics - Lattice, 2016
    Co-Authors: Hiroshi Suzuki
    Abstract:

    It is conceivable that the construction of the energy--momentum Tensor (EMT) in lattice field theory enlarges our ability in lattice field theory and also deepens our understanding on EMT at the non-pertubative level. In this talk, I will review recent developments in this enterprise.

  • universal formula for the energy momentum Tensor via a flow equation in the gross neveu model
    arXiv: High Energy Physics - Lattice, 2015
    Co-Authors: Hiroshi Suzuki
    Abstract:

    For the fermion field in the two-dimensional Gross--Neveu model, we introduce a flow equation that allows a simple $1/N$ expansion. By employing the $1/N$ expansion, we examine the validity of a universal formula for the energy--momentum Tensor which is based on the small flow-time expansion. We confirm that the formula reproduces a correct normalization and the conservation law of the energy--momentum Tensor by computing the translation Ward--Takahashi relation in the leading non-trivial order in the $1/N$ expansion. Also, we confirm that the expectation value at finite temperature correctly reproduces thermodynamic quantities. These observations support the validity of a similar construction of the energy--momentum Tensor via the gradient/Wilson flow in lattice gauge theory.

  • erratum energy momentum Tensor from the yang mills gradient flow progress of theoretical and experimental physics 2013 2013 083b03
    Progress of Theoretical and Experimental Physics, 2015
    Co-Authors: Hiroshi Suzuki
    Abstract:

    The product of gauge fields generated by the Yang-Mills gradient flow for positive flow times does not exhibit the coincidence-point singularity and a local product is thus independent of the regularization. Such a local product can furthermore be expanded by renormalized local operators at zero flow time with finite coefficients that are governed by renormalization group equations. Using these facts, we derive a formula that relates the small flow-time behavior of certain gauge-invariant local products and the correctly-normalized conserved Energy-Momentum Tensor in the Yang-Mills theory. Our formula provides a possible method to compute the correlation functions of a well-defined Energy-Momentum Tensor by using lattice regularization and Monte Carlo simulation.

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K Goeke - One of the best experts on this subject based on the ideXlab platform.