Glitches: The Exact Quantum Signatures of Pulsars Metamorphosis

Hujeirat, A.

doi:10.4236/jmp.2018.94038

Cited by 13 publications

(16 citation statements)

References 17 publications

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“…Under these conditions, supranuclear dense matter has little choice, but to be superfluid. These arguments are in line with well-observed glitch phenomena in pulsars (see [7,8,9,10] for further details). Superconductivity ensures that magnetic fields are expelled from the zero-temperature core into the boundary layer between the core and the overlaying compressible and dissipative normal matter.…”

Section: Introductionsupporting

confidence: 88%

“…On the other hand, the cores of old and massive NSs are made of zero-temperature supranuclear dense matter. Under these conditions, it was conjectured that the matter must be made of an incompressible superconducting gluon-quark superfluid [14]. While superconductivity and superfluidity are direct consequences of zero-temperature dense matter even under terrestrial conditions, the incompressibility of gluon-quark matter would remain a hypothesis that may not be verified under normal conditions.…”

Section: Introductionmentioning

confidence: 99%

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The progenitor of the big bang and its connection to the flatness and acceleration of the universe

Hujeirat¹

2022

Preprint

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It was argued that old and massive neutron stars end up as black objects that are made of purely incompressible superconducting gluon-quark superfluid matter (henceforth SuSu-objects). Based on theoretical investigations and numerical solving of the field equations with time-dependent spacetime topologies, I argue that a dense cluster of SuSu-objects at the background of flat spacetime that merged smoothly is a reliable candidate for the progenitor of the big bang. Here we present and use a new time-dependent spacetime metric, which unifies the metrics of Minkowski, Schwarzschild, and Friedmann as well as a modified TOV-equation for modeling dynamical contractions of relativistic objects. Had the progenitor undergone an abrupt decay, a hadronizing front forms at its surface and starts propagating from outside-to-inside, thereby hadronizing its entire content and changing the topology of the embedding spacetime from a flat into a dynamically expanding curved one. For an observer located at the center of the progenitor, $\mathcal{H}_0,$ the universe would be seen as isotropic and homogeneous, implying therefore that the last big bang event must have occurred in our neighborhood.For $ t\gg \tau_{dyn}$ the curved spacetime re-converge into a flat one, whereas the outward-propagation topological front, which separates the enclosed curved spacetime from the exterior flat one, would appear spatially and temporally accelerating outwards. The here-presented scenario suggests possible solutions to the flatness problem, the origin of acceleration of the universe andthe pronounced activities of high redshift QSOs .We anticipate that future observations by the James-Webb-Telescope to support our scenario when active QSOs with $ z >12 $ would be detected.

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Section: Introductionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The progenitor of the big bang and its connection to the flatness and acceleration of the universe

Hujeirat¹

2022

Preprint

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“…and n c R correspond to the cross-sectional area of the Su-Su-core and to the corresponding radius, respectively. The increase in the dimension of the core implies that the matter in the geometrically thin boundary layer between the SuSu-core and the ambient medium should undergo a crossover phase transition into an incompressible superfluid, whose total energy density saturates around the critical value [12] and the references therin). The growth of the core proceeds on the cosmic time scale and ends when the pulsar has metamorphosed entirely into a maximally compact invisible dark energy object and therefore becomes observationally indistinguishable from a stellar black hole.…”

Section: ∆ωmentioning

confidence: 99%

“…In [9] these equations were solved at the background of a bimetric space-time (see Figure 1). Unlike the original model [8], in which the spin-down of the Su-Su-core is set to follow a priori given sequence of values { } n c Ω , in the present work however, the SuSu-core is set to undergo an abrupt spin-down, if the difference between its Eigen rotation and that of the ambient medium surpasses a critical value { }…”

mentioning

confidence: 95%

How Massive Are the Superfluid Cores in the Crab and Vela Pulsars and Why Their Glitch-Events Are Accompanied with under and Overshootings?

Hujeirat

Samtaney

2020

JMP

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The Crab and Vela are well-studied glitching pulsars and the data obtained so far should enable us to test the reliability of models of their internal structures. Very recently it was proposed that glitching pulsars are embedded in bimetric spacetime: their incompressible superfluid cores (SuSu-cores) are embedded in flat spacetime, whereas the ambient compressible and dissipative media are enclosed in Schwarzschild spacetime. In this letter we apply this model to the Crab and Vela pulsars and show that a newly born pulsar initially of 1.25M and an embryonic SuSu-core of 0.029M  could evolve into a Crab-like pulsar after 1000 years and into a Vela-like pulsar 10,000 years later to finally fade away as an invisible dark energy object after roughly 10 Myr. Based thereon we infer that the Crab and the Vela pulsars should have SuSu-cores of 0.15M  and 0.55M  , respectively. Furthermore, the under-and overshootings phenomena observed to accompany the glitch events of the Vela pulsar are rather a common phenomenon of glitching pulsars that can be well-explained within the framework of bimetric spacetime.

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“…It is worthwhile to mention that, for studying of the compact objects such as neutron stars in modified gravities, it is necessary that we extract modified TOV equation. For example, the modified TOV equation in dilaton gravity [51], vector-tensor-Horndeski theory of gravity [52], gravity's rainbow [53,54], F (R) and F (G) gravities [55][56][57], massive gravity [58,59], and F (R, T ) gravity [60], have been evaluated (see [61][62][63][64][65][66][67][68][69][70][71][72][73][74] for more details). Therefore, for studying the structure of neutron stars with a quark core in Einstein-Λ gravity, we have to modify TOV equation.…”

Section: Introductionmentioning

confidence: 99%

The structure of hybrid neutron star in Einstein-$Λ$ gravity

Yazdizadeh,

Bordbar,

Panah

2019

Preprint

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Motivated by importance of the cosmological constant on structure of the hybrid neutron star. In other words, we want to investigate the structure of neutron stars by considering both the effects of the cosmological constant and the existence of quark matter for neutron stars in Einstein gravity. For this purpose, we use of a suitable equation of state (EoS) which includes a layer of hadronic matter, a mixed phase of quarks and hadrons, and, a quark matter in core. In order to investigate the effect of the cosmological constant on the structure of hybrid neutron stars, we utilize of modified TOV equation in Einstein-Λ gravity. Then we plot the mass-radius diagram for different value of the cosmological constant. Our results show that for small values of the cosmological constant (Λ), especially for the cosmological constant from the cosmological perspective (Λ = 10 −52 m −2 ), Λ has no significant effect on structure of hybrid neutron star. But for bigger values, for example, by considering Λ > 10 −14 m −2 , this quantity affects on the maximum mass and radius of these stars. The maximum mass and radius of these stars decrease by increasing the cosmological constant Λ. Also by determining and analyzing radius, compactness, Kretschmann scalar and gravitational redshift of a hybrid neutron star with M = 1.4M ⊙ in the presence of the cosmological constant, we find that, by increasing Λ, this star is contracted. Also, our results about dynamical stability show that these stars satisfy this stability.

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Glitches: The Exact Quantum Signatures of Pulsars Metamorphosis

Cited by 13 publications

References 17 publications

The progenitor of the big bang and its connection to the flatness and acceleration of the universe

The progenitor of the big bang and its connection to the flatness and acceleration of the universe

How Massive Are the Superfluid Cores in the Crab and Vela Pulsars and Why Their Glitch-Events Are Accompanied with under and Overshootings?

The structure of hybrid neutron star in Einstein-$Λ$ gravity

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