Instanton bags, high density holographic QCD, and chiral symmetry restoration

Bolognesi, Stefano

doi:10.1103/physrevd.90.105015

Cited by 6 publications

(8 citation statements)

References 61 publications

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“…In our soliton bag the abelian electric potential plays the role of the modulus of the Higgs field, taking different values inside and outside the bag. Note that our soliton bag is qualitatively different from the previously proposed instanton bag [17], in which monopole walls are embedded into the Sakai-Sugimoto model to produce a bag where the interior is filled with instanton charge density, rather than this density being localized on the surface of the bag.…”

Section: Introductioncontrasting

confidence: 69%

“…Finally, it is important to note that our soliton bag is qualitatively different from the instanton bag proposed in [17] as a description of the high density phase in the Sakai-Sugimoto model. The instanton bag is obtained via an initial compactification of one of the spatial directions to allow the embedding of a monopole wall.…”

Section: Baryonic Popcorn and Soliton Bagscontrasting

confidence: 57%

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Phases of kinky holographic nuclear matter

Elliot-Ripley

Sutcliffe

Zamaklar

2016

J. High Energ. Phys.

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Holographic QCD at finite baryon number density and zero temperature is studied within the five-dimensional Sakai-Sugimoto model. We introduce a new approximation that models a smeared crystal of solitonic baryons by assuming spatial homogeneity to obtain an effective kink theory in the holographic direction. The kink theory correctly reproduces a first order phase transition to lightly bound nuclear matter. As the density is further increased the kink splits into a pair of half-kink constituents, providing a concrete realization of the previously suggested dyonic salt phase, where the bulk soliton splits into constituents at high density. The kink model also captures the phenomenon of baryonic popcorn, in which a first order phase transition generates an additional soliton layer in the holographic direction. We find that this popcorn transition takes place at a density below the dyonic salt phase, making the latter energetically unfavourable. However, the kink model predicts only one pop, rather than the sequence of pops suggested by previous approximations. In the kink model the two layers produced by the single pop form the surface of a soliton bag that increases in size as the baryon chemical potential is increased. The interior of the bag is filled with abelian electric potential and the instanton charge density is localized on the surface of the bag. The soliton bag may provide a holographic description of a quarkyonic phase.

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Section: Introductioncontrasting

confidence: 69%

Section: Baryonic Popcorn and Soliton Bagscontrasting

confidence: 57%

Phases of kinky holographic nuclear matter

Elliot-Ripley

Sutcliffe

Zamaklar

2016

J. High Energ. Phys.

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“…Here, this is equivalent to gauge field configurations with nonzero topological charge on the connected flavor branes of the model [10], and various properties of baryons in the vacuum have been studied within this approach [10,11,[15][16][17]. Baryonic matter at nonzero density and temperature was first considered in a pointlike approximation of the instantons on the flavor branes [18], and this approach was improved and complemented by a number of studies [12,[19][20][21][22][23][24][25][26][27][28][29][30][31]. (For studies of baryonic matter using a different holographic approach, based on a D3-D7 setup, see for instance Refs.…”

Section: Introductionmentioning

confidence: 99%

Layers of deformed instantons in holographic baryonic matter

Preis

Schmitt

2016

J. High Energ. Phys.

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We discuss homogeneous baryonic matter in the decompactified limit of the Sakai-Sugimoto model, improving existing approximations based on flat-space instantons. We allow for an anisotropic deformation of the instantons in the holographic and spatial directions and for a density-dependent distribution of arbitrarily many instanton layers in the bulk. Within our approximation, the baryon onset turns out to be a second-order phase transition, at odds with nature, and there is no transition to quark matter at high densities, at odds with expectations from QCD. This changes when we impose certain constraints on the shape of single instantons, motivated by known features of holographic baryons in the vacuum. Then, a first-order baryon onset and chiral restoration at high density are possible, and at sufficiently large densities two instanton layers are formed dynamically. Our results are a further step towards describing realistic, strongly interacting matter over a large density regime within a single model, desirable for studies of compact stars.

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“…The two terms that we need are (3)(4)(5)(6)(7)(8)(9)(10)(11) There are many other possible scalar superfield combi nations which have the same number of superfields U and same number of covariant derivatives Da. The previous list does not provide a complete classification.…”

Section: (232)mentioning

confidence: 99%

“…The first one is that of the holographic QCD [5][6][7][8][9] and the second one is the so-called "generalized Skyrme model" [10][11][12][13], The first case is very similar to the f -*■ 0 limit in our toy model, while the second one is very similar to its f -* 1 limits (is essentially the same in one higher dimension). In both cases, one of the main physical reasons for studying the near-BPS systems is to have a model that reproduces the small binding energies observed in nuclear physics.…”

Section: Introductionmentioning

confidence: 99%

Baby Skyrme model, near-BPS approximations, and supersymmetric extensions

Bolognesi

Zakrzewski

2015

Phys. Rev. D

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We study the baby Skyrme model as a theory that interpolates between two distinct BPS systems. For this a near-BPS approximation can be used which, however, involves a small deviation from each of the two BPS limits. We provide analytical explanation and numerical support for the validity of this approximation. We then study the set of all possible supersymmetric extensions of the baby Skyrme model with N=1 and the particular ones with extended N=2 supersymmetries and relate this to the above mentioned almost-BPS approximation

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Instanton bags, high density holographic QCD, and chiral symmetry restoration

Cited by 6 publications

References 61 publications

Phases of kinky holographic nuclear matter

Phases of kinky holographic nuclear matter

Layers of deformed instantons in holographic baryonic matter

Baby Skyrme model, near-BPS approximations, and supersymmetric extensions

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