Electromagnetic signal of the QCD phase transition in neutron star mergers

Chen, Pisin; Labun, Lance

doi:10.1103/physrevd.88.083006

Cited by 10 publications

(4 citation statements)

References 68 publications

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“…The PT process can lead to observational signatures in the form of neutrino emission (Bhattacharyya et al 2006b;Pagliara et al 2013), gamma-ray bursts (GRBs) (Fryer & Woosley 1998;Bombaci & Datta 2000;Drago et al 2004;Mallick & Sahu 2014), GWs (Marranghello et al 2002;Lin et al 2011;Orsaria et al 2019) and even electromagnetic radiations (Jaikumar et al 2007;Chen & Labun 2013). Observing these signals could provide evidence of QSs existence and will lead to the inclusion of a new star to the existing family of compact stars, and will also provide insight into the high-density matter.…”

Section: Introductionmentioning

confidence: 99%

Spin-down induced quark-hadron phase transition in cold isolated neutron stars

Prasad

Mallick

2022

Monthly Notices of the Royal Astronomical Society

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We have studied the spin-down induced phase transition in cold, isolated neutron stars in this work. After birth, as the star slows down, its central density rises and crosses the critical density of phase transition, and a quark core is seeded inside the star. Intermediate mass stars are more likely to have a quark seeding in their lifetime at birth. Smaller neutron stars do not have a quark core and remain neutron stars throughout their life, whereas in massive stars, a quark core exists at their center from birth. In intermediate and massive stars, the quark core grows further as the star slows down. The appearance of a quark core leads to a sudden change in the moment of inertia of the star in its evolutionary history, and it is also reflected in a sudden discontinuity in the braking index of the star (at the frequency where the quark core first seeds). The energy released during the phase transition process as the quark core is seeded can excite the f-mode oscillation in the star and is emitted in the form of the gravitational wave, which is in the range of detection with present operating detectors; however, future detectors will enable a more clean extraction of this signals. Also, neutrinos and bursts of gamma-rays can originate from phase transition events. The spin-down induced phase transition could be gradual or in the form of subsequent leaps producing persistent or multiple transient emissions.

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Section: Introductionmentioning

confidence: 99%

Spin-down induced quark-hadron phase transition in cold isolated neutron stars

Prasad

Mallick

2022

Monthly Notices of the Royal Astronomical Society

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“…InFigure 1, ALICE, RHIC, FAIR, and NICA refer to various current and projected experimental programmes[55][56][57][58][59] designed to explore the physics of this diagram. Astrophysical phenomena such as core-collapse supernovae and neutron star mergers could also serve as arenas to study QCD phase transitions; see for example[60][61][62][63] 4. We are of course restricting ourselves here to those AdS-Reissner-Nordström black holes which do in fact give a broadly correct dual representation of the quark-gluon plasma.…”

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confidence: 99%

Cold black holes in the Harlow–Hayden approach to firewalls

2015

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Firewalls are controversial principally because they seem to imply departures from general relativistic expectations in regions of spacetime where the curvature need not be particularly large. One of the virtues of the Harlow-Hayden approach to the firewall paradox, concerning the time available for decoding of Hawking radiation emanating from charged AdS black holes, is precisely that it operates in the context of cold black holes, which are not strongly curved outside the event horizon. Here we clarify this point. The approach is based on ideas borrowed from applications of the AdS/CFT correspondence to the quark-gluon plasma. Firewalls aside, our work presents a detailed analysis of the thermodynamics and evolution of evaporating charged AdS black holes with flat event horizons. We show that, in one way or another, these black holes are always eventually destroyed in a time which, while long by normal standards, is short relative to the decoding time of Hawking radiation.

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“…Suggested scenarios invoke an early brief accretion phase (Metzger et al 2008), an early brief differential rotation phase (Fan et al 2013), or an early brief phasetransition phase (e.g. Cheng & Dai 1996;Chen & Labun 2013). The short GRB could be collimated by the torus within the accretion scenario (Bucciantini et al 2012).…”

Section: Conclusion and Discussionmentioning

confidence: 99%

A test of the millisecond magnetar central engine model of GRBs with Swift data

Lü,

Zhang

2014

Preprint

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A rapidly spinning, strongly magnetized neutron star (magnetar) has been proposed as one possible candidate of the central engine of gamma-ray bursts (GRBs). We systematically analyze the Swift/XRT light curves of long GRBs detected before 2013 August, and characterize them into four categories based on how likely they may harbor a magnetar central engine: Gold, Silver, Aluminum, and Non-magnetar. We also independently analyze the data of short GRBs with a putative magnetar central engine. We then perform a statistical study of various properties of the magnetar samples and the non-magnetar sample, and investigate whether the data are consistent with the hypothesis that there exist two types of central engines. By deriving the physical parameters of the putative magnetars, we find that the observations of the Gold and Silver samples are generally consistent with the predictions of the magnetar model. For a reasonable beaming factor for long GRBs, the derived magnetar surface magnetic field B p and initial spin period P 0 fall into the reasonable range. Magnetar winds in short GRBs, on the other hand, are consistent with being isotropic. No GRB in the magnetar sample has a beam-corrected total energy exceeding the maximum energy budget defined by the initial spin energy of the magnetar, while some non-magnetar GRBs do violate such a limit. With beaming correction, on average the non-magnetar sample is more energetic and luminous than the magnetar samples. Our analysis hints that millisecond magnetars are likely operating in a good fraction, but probably not all, GRBs.

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Electromagnetic signal of the QCD phase transition in neutron star mergers

Cited by 10 publications

References 68 publications

Spin-down induced quark-hadron phase transition in cold isolated neutron stars

Spin-down induced quark-hadron phase transition in cold isolated neutron stars

Cold black holes in the Harlow–Hayden approach to firewalls

A test of the millisecond magnetar central engine model of GRBs with Swift data

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