Holographic compact stars meet gravitational wave constraints

Eemeli Annala, Christian Ecker, Carlos Hoyos, Niko Jokela, David Rodriguez Fernandez, Aleksi Vuorinen

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

We investigate a simple holographic model for cold and dense deconfined QCD matter consisting of three quark flavors. Varying the single free parameter of the model and utilizing a Chiral Effective Theory equation of state (EoS) for nuclear matter, we find four different compact star solutions: traditional neutron stars, strange quark stars, as well as two non-standard solutions we refer to as hybrid stars of the second and third kind (HS2 and HS3). The HS2s are composed of a nuclear matter core and a crust made of stable strange quark matter, while the HS3s have both a quark mantle and a nuclear crust on top of a nuclear matter core. For all types of stars constructed, we determine not only their mass-radius relations, but also tidal deformabilities, Love numbers, as well as moments of inertia and the mass distribution. We find that there exists a range of parameter values in our model, for which the novel hybrid stars have properties in very good agreement with all existing bounds on the stationary properties of compact stars. In particular, the tidal deformabilities of these solutions are smaller than those of ordinary neutron stars of the same mass, implying that they provide an excellent fit to the recent gravitational wave data GW170817 of LIGO and Virgo. The assumptions underlying the viability of the different star types, in particular those corresponding to absolutely stable quark matter, are finally discussed at some length.
Originalspråkengelska
Artikelnummer078
TidskriftJournal of High Energy Physics
Volym2018
Utgåva12
Antal sidor38
ISSN1029-8479
DOI
StatusPublicerad - 13 dec 2018
MoE-publikationstypA1 Tidskriftsartikel-refererad

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  • 114 Fysik

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Annala, Eemeli ; Ecker, Christian ; Hoyos, Carlos ; Jokela, Niko ; Rodriguez Fernandez, David ; Vuorinen, Aleksi. / Holographic compact stars meet gravitational wave constraints. I: Journal of High Energy Physics. 2018 ; Vol. 2018, Nr. 12.
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abstract = "We investigate a simple holographic model for cold and dense deconfined QCD matter consisting of three quark flavors. Varying the single free parameter of the model and utilizing a Chiral Effective Theory equation of state (EoS) for nuclear matter, we find four different compact star solutions: traditional neutron stars, strange quark stars, as well as two non-standard solutions we refer to as hybrid stars of the second and third kind (HS2 and HS3). The HS2s are composed of a nuclear matter core and a crust made of stable strange quark matter, while the HS3s have both a quark mantle and a nuclear crust on top of a nuclear matter core. For all types of stars constructed, we determine not only their mass-radius relations, but also tidal deformabilities, Love numbers, as well as moments of inertia and the mass distribution. We find that there exists a range of parameter values in our model, for which the novel hybrid stars have properties in very good agreement with all existing bounds on the stationary properties of compact stars. In particular, the tidal deformabilities of these solutions are smaller than those of ordinary neutron stars of the same mass, implying that they provide an excellent fit to the recent gravitational wave data GW170817 of LIGO and Virgo. The assumptions underlying the viability of the different star types, in particular those corresponding to absolutely stable quark matter, are finally discussed at some length.",
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author = "Eemeli Annala and Christian Ecker and Carlos Hoyos and Niko Jokela and {Rodriguez Fernandez}, David and Aleksi Vuorinen",
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Holographic compact stars meet gravitational wave constraints. / Annala, Eemeli; Ecker, Christian; Hoyos, Carlos; Jokela, Niko; Rodriguez Fernandez, David; Vuorinen, Aleksi.

I: Journal of High Energy Physics, Vol. 2018, Nr. 12, 078, 13.12.2018.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Holographic compact stars meet gravitational wave constraints

AU - Annala, Eemeli

AU - Ecker, Christian

AU - Hoyos, Carlos

AU - Jokela, Niko

AU - Rodriguez Fernandez, David

AU - Vuorinen, Aleksi

PY - 2018/12/13

Y1 - 2018/12/13

N2 - We investigate a simple holographic model for cold and dense deconfined QCD matter consisting of three quark flavors. Varying the single free parameter of the model and utilizing a Chiral Effective Theory equation of state (EoS) for nuclear matter, we find four different compact star solutions: traditional neutron stars, strange quark stars, as well as two non-standard solutions we refer to as hybrid stars of the second and third kind (HS2 and HS3). The HS2s are composed of a nuclear matter core and a crust made of stable strange quark matter, while the HS3s have both a quark mantle and a nuclear crust on top of a nuclear matter core. For all types of stars constructed, we determine not only their mass-radius relations, but also tidal deformabilities, Love numbers, as well as moments of inertia and the mass distribution. We find that there exists a range of parameter values in our model, for which the novel hybrid stars have properties in very good agreement with all existing bounds on the stationary properties of compact stars. In particular, the tidal deformabilities of these solutions are smaller than those of ordinary neutron stars of the same mass, implying that they provide an excellent fit to the recent gravitational wave data GW170817 of LIGO and Virgo. The assumptions underlying the viability of the different star types, in particular those corresponding to absolutely stable quark matter, are finally discussed at some length.

AB - We investigate a simple holographic model for cold and dense deconfined QCD matter consisting of three quark flavors. Varying the single free parameter of the model and utilizing a Chiral Effective Theory equation of state (EoS) for nuclear matter, we find four different compact star solutions: traditional neutron stars, strange quark stars, as well as two non-standard solutions we refer to as hybrid stars of the second and third kind (HS2 and HS3). The HS2s are composed of a nuclear matter core and a crust made of stable strange quark matter, while the HS3s have both a quark mantle and a nuclear crust on top of a nuclear matter core. For all types of stars constructed, we determine not only their mass-radius relations, but also tidal deformabilities, Love numbers, as well as moments of inertia and the mass distribution. We find that there exists a range of parameter values in our model, for which the novel hybrid stars have properties in very good agreement with all existing bounds on the stationary properties of compact stars. In particular, the tidal deformabilities of these solutions are smaller than those of ordinary neutron stars of the same mass, implying that they provide an excellent fit to the recent gravitational wave data GW170817 of LIGO and Virgo. The assumptions underlying the viability of the different star types, in particular those corresponding to absolutely stable quark matter, are finally discussed at some length.

KW - Holography and quark-gluon plasmas

KW - Phase Diagram of QCD

KW - APPROACHING SCHWARZSCHILD LIMIT

KW - NEUTRON-STAR

KW - DYNAMICAL INSTABILITY

KW - SYMMETRY-BREAKING

KW - DENSITY

KW - QCD

KW - EQUILIBRIUM

KW - TEMPERATURE

KW - SIGNALS

KW - PHYSICS

KW - 114 Physical sciences

U2 - 10.1007/JHEP12(2018)078

DO - 10.1007/JHEP12(2018)078

M3 - Article

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 12

M1 - 078

ER -