Does dark matter admixed pulsar exist?

Molla, Sajahan; Ghosh, Bidisha; Kalam, Mehedi

doi:10.1140/epjp/s13360-020-00364-1

Cited by 11 publications

(6 citation statements)

References 103 publications

(114 reference statements)

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“…Previously [73,75], we have considered a two-fluid pulsar model, assuming it to be made of ordinary matter admixed with dark matter. We have investigated it based on (i) the singular isothermal sphere (SIS) profile for pulsars in the galactic halo region of different galaxies [73]. (ii) the universal rotational curve (URC) profile for pulsars in the galactic halo region of Milky Way galaxy [75].…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…) (by taking metric constants a = 0.003 km −2 , C = 0.8, m = 0.1; core radius r 0 = 9.11 kpc; and effective core density, ρ 0 = 5 × 10 −24 r 0 8.6kpc −1 gm/c.c. [75] ) or the SIS dark-matter density profile (ρ d = K 2πGr 2 ) (by taking velocity dispersion, K = 10 −7 (as for spiral galaxies K ∼ 10 −7 [73]) and metric constants a = 0.002 km −2 , C = 1.14, and m = 0.01) instead of the NFW density profile and applied it to the same pulsars, located in Milky Way galaxy, we can obtain the comparison chart shown in Tables 3-5 . 3 and 4, we see that pulsars radii are at a minimum in URC profile, whereas they are at a maximum in NFW profile (due to change in mass function graph).…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…Some astrophysicists [60,63,65,66,[68][69][70][71][72] have worked on the dark matter neutron star. Inspired by their work, we have investigated [73] the existence of dark matter in pulsars by using the singular isothermal sphere (SIS) density profile. We have assumed the pulsars to be made of ordinary matter admixed with dark matter having a density distribution of…”

Section: Introductionmentioning

confidence: 99%

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PossibleExistence of Dark-Matter-Admixed Pulsar in the Disk Region of the Milky Way Galaxy

et al. 2022

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In our previous study, (Eur Phys J Plus 135:362, 2020 & Eur Phys J Plus 135:637, 2020), we have discussed the possible existence of the dark-matter-admixed pulsars, located in dwarf as well as in massive spiral galaxies (based on Singular Isothermal Sphere dark-matter density profile) and in the Milky Way galaxy (based on Universal Rotational Curve dark-matter density profile). In this article, we use the Navarro–Frenk–White (NFW) dark-matter density profile to get analogous results for the pulsars in the disk region of the Milky Way galaxy. These findings may be treated as valuable complements to the previous findings. We conclude from our findings that there is a unique possibility of the presence of dark-matter-admixed pulsars in all the regions of the galaxies.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PossibleExistence of Dark-Matter-Admixed Pulsar in the Disk Region of the Milky Way Galaxy

et al. 2022

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“…The success in using the DM-admixed neutron star model to account for unusual compact objects that do not follow their expected mass-radius relations (Molla et al 2020;Rahman et al 2020;Das et al 2021;Lee et al 2021) inspires us to perform a similar analysis for peculiar WDs. We extract the observed mass-radius data for the WDs from Dufour et al (2017) and Należyty & Madej (2004), and show them in Figure 1.…”

Section: Mass-radius Relationsmentioning

confidence: 99%

Dark Matter–admixed Rotating White Dwarfs as Peculiar Compact Objects

Chan

Chu

Leung

2022

ApJ

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Discoveries of anomalous compact objects challenge our understanding of the standard theory of stellar structures and evolution, so they serve as an excellent laboratory for searching for new physics. Earlier studies on spherically symmetric dark matter (DM)–admixed compact stars could explain a handful of anomalies. In this paper, we investigate the observational signatures of DM-admixed rotating white dwarfs, and make connections to observed peculiar compact objects. We compute the equilibrium structures of DM-admixed rotating white dwarfs using a self-consistent, two-fluid method, with the DM component being a nonrotating degenerate Fermi gas. We find that admixing DM to rotating white dwarfs could: (1) account for some peculiar white dwarfs that do not follow their usual mass–radius relation; (2) allow stable rapid-rotating white dwarfs that are free from thermonuclear runaway to exist, which could explain some soft gamma-ray repeaters/anomalous X-ray pulsars; and (3) produce universal I (moment of inertia)–Love (tidal Love number)–Q (quadrupole moment) relations that span bands above those without DM admixture, thus providing an indirect way of searching for DM in white dwarfs through gravitational-wave detection. To conclude, DM-admixed rotating white dwarfs can account for some peculiar compact objects. Our results suggest a systematic approach to accounting for the unusual compact objects that upcoming surveys could discover.

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“…This repulsiveness in anisotropic force enhances the stability of the star resulting in the star to be more compact than the isotropic one. [33][34][35]…”

Section: Matching Conditionmentioning

confidence: 99%

Analytical model of low mass strange stars in 2+1 spacetime

Murshid¹,

Rahman²,

Radinschi³

et al. 2021

Preprint

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The low mass compact stars are quite fascinating objects to study for their enigmatic behaviour. In this paper, we have modeled this kind of low mass strange stars based on the Heintzmann ansatz [1] in (2 + 1) dimension. Attractive anisotropic force plays a significant role to restrict the upper mass limit (which is comparatively low) of the strange star. We have applied our model to some low mass strange stars. Our model could be useful to predict the important parameters of the low mass strange stars.

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Does dark matter admixed pulsar exist?

Cited by 11 publications

References 103 publications

PossibleExistence of Dark-Matter-Admixed Pulsar in the Disk Region of the Milky Way Galaxy

PossibleExistence of Dark-Matter-Admixed Pulsar in the Disk Region of the Milky Way Galaxy

Dark Matter–admixed Rotating White Dwarfs as Peculiar Compact Objects

Analytical model of low mass strange stars in 2+1 spacetime

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