Generalized parton distributions in an AdS/QCD hard-wall model

Vega, Alfredo; Schmidt, Iván; Gutsche, Thomas; Lyubovitskij, Valery E.

doi:10.1103/physrevd.85.096004

Cited by 49 publications

(14 citation statements)

References 66 publications

(109 reference statements)

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“…Indeed we find that the core properties strongly depend on σ 0 (see Sec. IV E. Hence other WDM models, which are already known to yield different cutoff effects on the primordial power spectrum [63][64][65][66], might also lead to noticeable effects on the core properties. In this respect, accurate analysis at the linear level also of WDM velocities, as that in ref.…”

Section: B Directions For Improvementmentioning

confidence: 97%

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

Destri

2014

Phys. Rev. D

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We report the results of extended high-resolution numerical integrations of the Vlasov-Poisson equation for the collapse of spherically symmetric WDM halos. For thermal relics with mass m = 1 keV/c 2 , we find collapsed halos with cores of size from 0.1 to 0.6 kpc. The typical core is hollow, with the mass density decreasing towards the core center by almost three orders of magnitude from its maximum near the core radius rc. The core is in equilibrium with the diffused part of the halo but far from virialization. These properties are rooted in the conservation of the squared angular momentum and in the original excess, proper of WDM initial conditions, of kinetic energy in the core region. In a sample of more than one hundred simulated collapses, the values of rc and of the core density ρc are in the range typical of dwarf spheroids, while the maximal circular velocities Vmax are proper of small disk galaxies. The product µc = ρcrc takes values between 116 M /pc 2 and 283 M /pc 2 , while the surface density µ0, as determined from a Burkert fit, is roughly three times larger. From these data and data obtained at smaller values of m, we extrapolate for one particular halo µc = 263(308) M /pc 2 and µ0 = 754(855) M /pc 2 at m = 2(3.3) keV/c 2 , to be compared with the observed value 1402 . In view of the many improvements and enhancements available, we conclude that WDM is a viable solution for explaining the presence and the size of cores in low mass galaxies.

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Section: B Directions For Improvementmentioning

confidence: 97%

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

Destri

2014

Phys. Rev. D

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“…In terms of the holographic wave functions φ ± derived from Ad S/QC D, the Dirac form factors for the nucleons in the present soft-wall linear model are given by [32,[49][50][51][52][53]56]…”

Section: Gpds and Sum Rules At ξ =mentioning

confidence: 99%

“…[47,48], and GPDs have been investigated by many authors both within the hard-wall [49,50] and soft-wall [51][52][53][54] models. Because of the nature of the AdS-QCD analogy in the region of DIS, the results are restricted to the forward limit (ξ = 0) (cf.…”

Section: Introductionmentioning

confidence: 99%

Generalized parton distributions: confining potential effects within AdS/QCD

Traini

2017

Eur. Phys. J. C

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Generalized parton distributions are investigated within a holographic approach where the string modes in the fifth dimension describe the nucleon in a bottom-up or AdS/QCD framework. The aim is to bring the AdS/QCD results in the realm of phenomenology in order to extract consequences and previsions. Two main aspects are studied: (i) the role of the confining potential needed for breaking conformal invariance and introducing confinement (both: classic soft-wall and recent infra-red potentials are investigated); (ii) the extension of the predicted GPDs to the entire range of offforward kinematics by means of double distributions. Higher Fock states are included describing the nucleon as a superposition of three valence quarks and quark-antiquark pairs and gluons.

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“…This is a method based upon numerical simulations, however, the applicability is limited by enormous computational complexities, dependence upon the free parameters, and the fact that dynamical observables in Minkowski spacetime can not be directly observed in the Euclidean lattice computations. Recently, there has been a lot of activity in calculating GPDs in the anti-de Sitter AdS/QCD holography based models as well [8]. In this approach, information on GPDs is obtained via matching the matrix elements of electromagnetic current with QCD sum rules in the hard and soft-wall models [9].…”

Section: Introductionmentioning

confidence: 99%

Momentum transfer dependence of generalized parton distributions

Sharma

2016

Eur. Phys. J. A

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We revisit the model for parametrization of momentum dependence of nucleon generalized parton distributions in the light of recent MRST measurements of parton distribution functions [1]. Our parametrization method with minimum set of free parameters give a sufficiently good description of data for Dirac and Pauli electromagnetic form factors of proton and neutron at small and intermediate values of momentum transfer. We also calculate the GPDs for up and down quark by decomposing the electromagnetic form factors for nucleon using the charge and isospin symmetry and also study the evolution of GPDs to a higher scale. We further investigate the transverse charge densities for both the unpolarized and transversely polarized nucleon and compare our results with the Kelly's distribution.

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Generalized parton distributions in an AdS/QCD hard-wall model

Cited by 49 publications

References 66 publications

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

Hollow cores in warm dark matter halos from the Vlasov-Poisson equation

Generalized parton distributions: confining potential effects within AdS/QCD

Momentum transfer dependence of generalized parton distributions

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