Millisecond pulsars modeled as strange quark stars admixed with condensed dark matter

Panotopoulos, Grigoris; Lopes, Ilídio

doi:10.1142/s0218271818500931

Cited by 21 publications

(9 citation statements)

References 99 publications

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“…Although refinements of the bag model exist in the literature [45][46][47] (for the present state-of-the-art see the recent paper [48]), the above analytical expression "radiation plus constant" has been employed in recent works, both in GR [49][50][51][52], and in R-squared gravity [53][54][55]. Since the aim of this work is to investigate the impact of the Gauss-Bonnet parameter on properties of strange quark stars, we will consider here the MIT bag model despite its simplicity, as it suffices for our purposes.…”

Section: Equation-of-statementioning

confidence: 99%

Relativistic strange quark stars in Lovelock gravity

Panotopoulos

Rincón

2019

Eur. Phys. J. Plus

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We study relativistic non-rotating stars in the framework of Lovelock gravity. In particular, we consider the Gauss-Bonnet term in a five-dimensional spacetime, and we investigate the impact of the Gauss-Bonnet parameter on properties of the stars, both isotropic and anisotropic. For matter inside the star, we assume a relativistic gas of de-confined massless quarks. We integrate the modified Tolman-Oppenheimer-Volkoff equations numerically, and we obtain the mass-to-radius profile, the compactness of the star as well as the gravitational red-shift for several values of the Gauss-Bonnet parameter. The maximum star mass and radius are also reported. PACS. XX.XX.XX No PACS code given 1 IntroductionAlthough our observable Universe is clearly four-dimensional, the question "How many dimensions are there?" is one of the fundamental questions High Energy Physics tries to answer. Kaluza-Klein theories [1,2], supergravity [3] and Superstring/M-Theory [4,5] have pushed forward the idea that extra spatial dimensions may exist. In more than four dimensions higher order curvature terms are natural in Lovelock theory [6], and also higher order curvature corrections appear in the low-energy effective equations of Superstring Theory [7].The amount of published works in the literature reveals that Lovelock gravity is an exciting and active field. Black hole physics [8][9][10][11][12][13][14], cosmological solutions [15][16][17][18] and holographic superconductors exploiting the gauge/gravity duality [19] are some of the areas that have been explored in the framework of Lovelock gravity. However, the astrophysical implications of Lovelock theory should also be investigated. Compact objects [20][21][22], such as white dwarfs and neutron stars, are the final fate of stars, and comprise excellent cosmic laboratories to study, test and constrain new physics and/or alternative theories of gravity under extreme conditions that cannot be reached in Earth-based experiments. It is well-known that the properties of compact objects, such as mass and radius, depend both on the equation-of-state (EoS) of ultra-dense matter and on the underlying theory of gravity.A couple of years after the discovery of the neutron by James Chadwick [23,24], neutron stars were predicted to exist by Baade and Zwicky [25]. Indeed, several decades after that, the discoveries of pulsars in the Crab and Vela supernova remnants [26] led to their identification as neutron stars just one year after the discovery of pulsars in 1967 [27]. On the other hand quark matter is by assumption absolutely stable, and as such it may be the true ground state of hadronic matter [28,29]. Therefore a new class of hypothetical compact objects has been postulated to exist. These compact objects could serve as an alternative to neutron stars, and they might offer us a plausible explanation of the puzzling observation of some super-luminous supernovae [30,31], which occur in about one out of every 1000 supernovae explosions, and which are more than 100 times more luminous than regular su...

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Section: Equation-of-statementioning

confidence: 99%

Relativistic strange quark stars in Lovelock gravity

Panotopoulos

Rincón

2019

Eur. Phys. J. Plus

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“…Thus, for a given density profile ρ(r), we can compute the anisotropic factor for a self-gravitating system. Notice that the classical formalism, i.e., selecting a suitable form of the anisotropic factor by hand (among other alternatives), has also been significantly investigated over the years (see, for instance, [29,43,[57][58][59][60][61][62][63][64][65][66][67] and the references therein). As the complexity factor formalism in the context of relativistic stars is so helpful, we will follow this idea and contrast the results obtained following such an approach with solutions coming from the canonical method, i.e., taking by hand the anisotropic factor, for instance.…”

Section: Vanishing Complexity Factor Formalismmentioning

confidence: 99%

Anisotropic Quark Stars with an Interacting Quark Equation of State within the Complexity Factor Formalism

Rincon,

Panotopoulos,

Lopes

2023

Preprint

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“…The accrecred DM particles therefore remain confined within a region of small radius inside the star. Lopes (2018aLopes ( , 2017c; Miao et al (2022) and the two fluid approach is mostly adopted in such works. In this context it is worth mentioning that the interaction between DM and SQM in the DM admixed SQSs is not considered before in the existing literature to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Vector dark boson mediated feeble interaction between fermionic dark matter and strange quark matter in quark stars

Sen¹,

Guha²

2022

Preprint

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We study the structural properties like the gravitational mass, radius and tidal deformability of dark matter (DM) admixed strange quark stars (SQSs). For the purpose we consider the vector MIT Bag model to describe the strange quark matter (SQM) and investigate the possible presence of accreted DM in the SQSs consequently forming DM admixed SQSs. We introduce feeble interaction between SQM and the accreted fermionic DM via a vector dark boson mediator. Considering the present literature, in the context of possible presence of DM in SQSs, this work is the first to consider interaction between DM and SQM in the DM admixed SQSs. The mass of the DM fermion (m χ ) and the vector mediator (m ξ ) and the coupling (y ξ ) between them are determined in accordance with the constraint from Bullet cluster and the present day relic abundance, respectively. We find that the presence of DM reduces both the mass and radius of the star compared to the no-DM case. The massive the DM fermion, the lower the values of maximum mass and radius of the DM admixed SQSs. For the chosen values of m χ and corresponding values of m ξ and y ξ , the computed structural properties of the DM admixed SQSs satisfy all the various present day astrophysical constraints.We obtain massive DM admixed SQSs configurations consistent with the GW190814 observational data. Hence the secondary compact object associated with this event may be a DM admixed SQS.

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Millisecond pulsars modeled as strange quark stars admixed with condensed dark matter

Cited by 21 publications

References 99 publications

Relativistic strange quark stars in Lovelock gravity

Relativistic strange quark stars in Lovelock gravity

Anisotropic Quark Stars with an Interacting Quark Equation of State within the Complexity Factor Formalism

Vector dark boson mediated feeble interaction between fermionic dark matter and strange quark matter in quark stars

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