Equation of state of cosmic strings with fermionic current carriers

Ringeval, Christophe

doi:10.1103/physrevd.63.063508

Cited by 19 publications

(15 citation statements)

References 46 publications

(88 reference statements)

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“…(3.5). 8 The second and the third terms represent the massive bounded modes in the string and the unbounded continuous modes, respectively [17,35,36]. The creation operators of the zero modes satisfy,…”

Section: Decay Of Fermion Zero Mode In Curved Stringmentioning

confidence: 99%

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On stability of fermionic superconducting current in cosmic string

Ibe

Kobayashi

Nakayama

et al. 2021

J. High Energ. Phys.

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Recently, the chiral superconductivity of the cosmic string in the axion model has gathered attention. The superconductive nature can alter the standard understanding of the cosmology of the axion model. For example, a string loop with a sizable super-conducting current can become a stable configuration, which is called a Vorton. The superconductive nature can also affect the cosmological evolution of the string network. In this paper, we study the stability of the superconducting current in the string. We find the superconductivity is indeed stable for a straight string or infinitely small string core size, even if the carrier particles are unstable in the vacuum. However we also find that the carrier particle decays in a curved string in typical axion models, if the carrier particles are unstable in the vacuum. Accordingly, the lifetime of the Vorton is not far from that of the carrier particle in the vacuum.

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Section: Decay Of Fermion Zero Mode In Curved Stringmentioning

confidence: 99%

“…In this analysis, we do not take into account the contributions of the bounded massive modes to the fermion propagator [17,35,36]. The fermion zero mode can also decay into the SM particles through the mixing with the bounded massive modes due to the modulation.…”

Section: Jhep05(2021)217mentioning

confidence: 99%

On stability of fermionic superconducting current in cosmic string

Ibe

Kobayashi

Nakayama

et al. 2021

J. High Energ. Phys.

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“…We have solved numerically the coupled set of differential equations (9), (11) and (12), subject to the appropriate boundary conditions (13) and (14).…”

Section: B Numerical Constructionmentioning

confidence: 99%

“…[10] and references therein), in which case they are very likely to have bosonic condensates [11] or be currentcarrying [12]. The structure of such objects has been studied in detail for many models, from the original Witten [13] fermionic [14,15] or bosonic kind [16][17][18][19], leading to effective equations of state [20,21] potentially useful for large scale network simulations [22,23]. Until the reason why strings have yet not been observed in the CMB is clarified, it is therefore of utmost importance to understand in as many details as possible their internal structure and the associated plausible cosmological consequences.…”

Section: Introductionmentioning

confidence: 99%

Excited cosmic strings with superconducting currents

2017

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Hartmann, Betti, Michel, Florent Peter, Patrick (2017). Excited cosmic strings with superconducting currents. Physical Review D 96(12): 123531 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We present a detailed analysis of excited cosmic string solutions that possess superconducting currents. These currents can be excited inside the string core, and-if the condensate is large enough-can lead to the excitations of the Higgs field. Next to the case with global unbroken symmetry, we discuss also the effects of the gauging of this symmetry and show that excited condensates persist when coupled to an electromagnetic field. The space-time of such strings is also constructed by solving the Einstein equations numerically and we show how the local scalar curvature is modified by the excitation. We consider the relevance of our results on the cosmic string network evolution as well as observations of primordial gravitational waves and cosmic rays.

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“…By substituting the non-vanishing components of the torsion (25) and (26) satisfying the SCP into the expression for the spin density of a Weyssenhoff fluid (28), it is straightforward to show that the spin-density tensor has to vanish:…”

Section: Weyssenhoff Fluid With Macroscopic Spin Averagingmentioning

confidence: 99%

Classical big-bounce cosmology: dynamical analysis of a homogeneous and irrotational Weyssenhoff fluid

Brechet

Hobson

Lasenby

2008

Class. Quantum Grav.

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A dynamical analysis of an effective homogeneous and irrotational Weyssenhoff fluid in general relativity is performed using the 1+3 covariant approach that enables the dynamics of the fluid to be determined without assuming any particular form for the spacetime metric. The spin contributions to the field equations produce a bounce that averts an initial singularity, provided that the spin density exceeds the rate of shear. At later times, when the spin contribution can be neglected, a Weyssenhoff fluid reduces to a standard cosmological fluid in general relativity. Numerical solutions for the time evolution of the generalized scale factor R(t) in spatially curved models are presented, some of which exhibit eternal oscillatory behaviour without any singularities. In spatially flat models, analytical solutions for particular values of the equation-of-state parameter are derived. Although the scale factor of a Weyssenhoff fluid generically has a positive temporal curvature near a bounce (i.e.R(t) > 0), it requires unreasonable fine tuning of the equation-of-state parameter to produce a sufficiently extended period of inflation to fit the current observational data.

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Equation of state of cosmic strings with fermionic current carriers

Cited by 19 publications

References 46 publications

On stability of fermionic superconducting current in cosmic string

On stability of fermionic superconducting current in cosmic string

Excited cosmic strings with superconducting currents

Classical big-bounce cosmology: dynamical analysis of a homogeneous and irrotational Weyssenhoff fluid

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