We employ the recently improved description of dense baryonic matter within Witten-Sakai-Sugimoto model to construct neutron stars. In contrast previous holographic approaches, presence an isospin asymmetry allows us implement beta equilibrium and electric charge neutrality. As a consequence, we are able crust star same formalism compute location crust-core transition dynamically. After showing that simple pointlike approximation for baryons fails satisfy astrophysical constraints,...

We improve the holographic description of isospin-asymmetric baryonic matter within Witten-Sakai-Sugimoto model by accounting for a realistic pion mass, computing condensate dynamically, and including rho meson condensation allowing gauge field in bulk to be anisotropic. This takes into account coexistence with condensates. Our main result is zero-temperature phase diagram plane baryon isospin chemical potentials. find that effective mass medium increases density that, as consequence, there...

A bstract We compute a large collection of string worldsheet correlators describing light probes interacting with heavy black hole microstates. The states consist NS5 branes carrying momentum and/or fundamental charge. In the fivebrane decoupling limit, theory on family such backgrounds is given by exactly solvable null-gauged WZW models. construct physical vertex operators in these cosets, including all massless fluctuations. class novel heavy-light-light-heavy AdS 3 where include those...

A bstract We describe the back-reaction of gaugino condensates in supersymmetric AdS 4 Type II String Theory compactifications with fluxes. use generalized complex geometry to capture modification ten-dimensional supersymmetry equations and show that cosmological constant prevents cycle wrapped by branes condensation from shrinking zero size. Thus, unlike ordinary geometric transitions flat space, volume this remains finite. For D7 condensation, gives a account Kähler moduli stabilization....

Light probes interacting with heavy bound states such as black holes give rise to observables containing valuable dynamical information. Recently, a family of hole microstates was shown admit an exact string worldsheet description. We construct the physical vertex operators these models, and compute extensive set novel heavy-light correlators. then obtain first match between correlators in holographically dual conformal field theory. conjecture closed formula for arbitrary number light...

A bstract Correlation functions of the SL(2,ℝ)-WZW model involving spectrally flowed vertex operators are notoriously difficult to compute. An explicit integral expression for corresponding three-point was recently conjectured in [1]. In this paper, we provide a proof conjecture. For this, extend methods [2] based on so-called SL(2,ℝ) series identifications, which relate belonging different spectral flow sectors. We also highlight role holomorphic covering maps context. Our results...

Deep inelastic scattering of leptons from hadrons at small values the Bjorken parameter x is studied superstring theory. In particular, we focus on single-flavored scalar and vector mesons in large N limit. This terms different holographic dual models with flavor Dp-branes type IIA IIB theories, strong coupling limit corresponding gauge theories. We derive hadronic tensor structure functions for polarized mesons. obtain eight parameter. The main result that new relations Callan-Gross several...

A bstract We study the phase structure of Witten-Sakai-Sugimoto model in plane temperature and baryon chemical potential, including effect a nonzero current quark mass. Our is performed decompactified limit model, which, at least regarding chiral transition, appears to be closer real-world QCD than original version. Following earlier studies, we account for mass an effective way based on open Wilson line operator whose expectation value identified with condensate. find that stabilizes...

Gaugino condensation on D-branes wrapping internal cycles gives a mechanism to stabilize the associated moduli. According effective field theory, this rise, when combined with fluxes, supersymmetric AdS4 solutions. In paper we provide ten-dimensional description of these vacua. We first find supersymmetry equations for type II vacua gaugino condensates D-branes, in framework generalized complex geometry. then solve them IIB compactifications smeared D7-branes. show that requires (conformal)...

We consider three-point correlation functions for superstrings propagating in AdS$_3\times S^3 \times T^4$. In the RNS formalism, these generically involve correlators with current insertions. When vertex operators non-trivial spectral flow charges are present, their complicated OPEs currents imply that standard methods can not be used to compute such correlators. Here we develop novel techniques computing all $m$-basis of supersymmetric model. then show how, some cases, results translated...

A bstract We compute all worldsheet three-point functions involving spectrally-flowed operators in chiral multiplets of the space-time theory for strings AdS 3 × S T 4 , thus completing analysis full /CFT 2 ring. make use techniques recently developed bosonic sector, based on holomorphic covering maps from to boundary. highlight role so-called series identifications when dealing with complications originated by picture-changing states. find an exact agreement predictions holographic CFT at...

Differential cross sections of deep inelastic scattering charged leptons from hadrons are investigated by using the gauge/string duality. We consider vector mesons derived different holographic dual models obtaining a general expression. focus on strongly coupled regime gauge theories for values Bjorken parameter. find new predictions which particularly interesting differential polarized scattered off mesons. also carry out detailed comparison moments structure functions with lattice QCD results.

Deep inelastic scattering (DIS) of charged leptons off scalar mesons in the 1/N expansion is studied by using gauge/gravity duality. We focus on D3D7-brane system and investigate corresponding structure functions considering both high energy limit expansion. These limits do not commute. From D7-brane DBI action we derive a Lagrangian at sub-leading order fluctuations obtain number interactions some which become relevant for two-hadron final-state DIS. By first followed large N one, our...

We point out a new configuration in the Witten-Sakai-Sugimoto model, allowing baryons pointlike approximation to coexist with fundamental quarks. The resulting phase is holographic realization of quarkyonic matter, which predicted occur QCD at large number colors, and possibly plays role real-world as well. find that matter chirally symmetric that, for baryon chemical potentials, it energetically preferred over pure nuclear quark matter. zero-temperature transition from first order chiral...

$1/N^2$ corrections to deep inelastic scattering (DIS) of charged leptons from glueballs at strong coupling are investigated in the framework gauge/gravity duality. The structure functions $F_1$ and $F_2$ (and also $F_L$) studied subleading order expansion, terms $q^2$ Bjorken parameter $x$. relevant type IIB supergravity one-loop diagrams (which correspond DIS with two-hadron final states) detail, while $n$-loop (corresponding $(n+1)$-hadron briefly discussed. $1/N^{2n}$ $\Lambda^2/q^2$...

We discuss masses, radii, and tidal deformabilities of neutron stars constructed from the holographic Witten-Sakai-Sugimoto model. Using same model for crust core star, we combine our theoretical results with latest astrophysical data, thus deriving more stringent constraints than given by data alone. For instance, calculation predicts -- independent parameters an upper limit maximal mass star about 2.46 solar masses a lower (dimensionless) deformability 1.4-solar-mass 277.

We provide a novel local definition for spectrally flowed vertex operators in the SL(2,\mathbb{R}) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mi>L</mml:mi><mml:mo stretchy="false" form="prefix">(</mml:mo><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mstyle mathvariant="double-struck"><mml:mi>ℝ</mml:mi></mml:mstyle><mml:mo form="postfix">)</mml:mo></mml:mrow></mml:math> -WZW model, generalising proposal of Maldacena and Ooguri...

A bstract We present a detailed study of spectrally flowed four-point functions in the SL(2,ℝ) WZW model, focusing on their conformal block decomposition. Dei and Eberhardt conjectured general formula relating these observables to unflowed counterparts. Although latter are not known closed form, expansion has been formally established. By combining this information with integral transform that encodes effect spectral flow, we show how describe considerable number s -channel exchanges,...

We study polarized deep inelastic scattering of charged leptons from spin-$1/2$ hadrons at low values the Bjorken parameter and large 't Hooft coupling in terms gauge/string theory duality. calculate structure functions type IIB superstring amplitudes. discuss role non-Abelian Chern-Simons term Pauli five-dimensional $SU(4)$ gauged supergravity. Furthermore, exponentially small-$x$ regime where Regge physics becomes important is analyzed detail for antisymmetric functions. In this case...

We compute the four-dimensional gaugino mass for a Dp-brane extended in spacetime and wrapping cycle on internal geometry warped compactification with fluxes. Motivated by backreaction of bilinear VEVs, we use Generalized Complex Geometry to characterize as well wrapped brane. find that RR fluxes non-closure generalized complex structures combine terms same form they do bulk superpotential, while NSNS there is crucial minus sign component normal Our expression extends known result D3...

We calculate the structure function $F_3(x,q^2)$ of hadronic tensor deep inelastic scattering (DIS) charged leptons from glueballs ${\cal {N}}=4$ SYM theory at strong coupling and small values Bjorken parameter in gauge/string duality framework. This is done terms type IIB superstring amplitudes. From AdS$_5$ perspective, relevant part amplitude comes five-dimensional non-Abelian Chern-Simons $SU(4)$ gauged supergravity obtained dimensional reduction on $S^5$. we derive an effective...

We study baryonic matter with isospin asymmetry, including fully dynamically its interplay pion condensation. To this end, we employ the holographic Witten-Sakai-Sugimoto model and so-called homogeneous ansatz for gauge fields in bulk to describe matter. Within confined geometry restricting ourselves chiral limit, map out phase structure presence of baryon chemical potentials, showing that sufficiently large potentials condensed pions isospin-asymmetric coexist. also present first results...

The structure functions $F_1$ and $F_2$ of the hadronic tensor vector mesons are obtained at order $1/N$ strong coupling using gauge/gravity duality. We find that large $N$ limit high energy one do not commute. Thus, by considering first, our results first moments for rho meson agree well with those from lattice QCD, an important improvement accuracy respect to holographic dual calculation in planar limit.

We study maximally supersymmetric irrelevant deformations of the D1-D5 CFT that correspond to following attractor flow in reverse dual half-BPS black string solutions type IIB supergravity on K3. When a single, quadratic condition is imposed parameters 22 such deformations, asymptotics solution degenerate linear dilaton like spacetime. identify each degeneration limit with known decoupling theory, which yields little theory or thereof (the so-called open brane LST, ODp theories),...