Combined boson-fermion stars

Henriques, Alfredo B.; Liddle, Andrew R.; Moorhouse, R. G.

doi:10.1016/0370-2693(89)90623-0

Cited by 78 publications

(88 citation statements)

References 15 publications

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“…The stability of four-dimensional boson-fermion stars [5] has been studied by several authors. The perturbative stability can be judged by the line of zero eigenvalue about particle numbers in the (x, y) plane, where we denote ϕ * 0 andμ 0 −1 as x and y, respectively.…”

Section: Stablity Of Boson-fermion Starsmentioning

confidence: 99%

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Exact solutions for boson-fermion stars in 2+1 dimensions

Sakamoto

Shiraishi

1998

Phys. Rev. D

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We solve Einstein equations coupled to a complex scalar field with infinitely large self-interaction, degenerate fermions, and a negative cosmological constant in (2 + 1) dimensions. Exact solutions for static boson-fermion stars are found when circular symmetry is assumed. We find that the minimum binding energy of boson-fermion star takes a negative value if the value of the cosmological constant is sufficiently small. PACS number(s): 04

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Section: Stablity Of Boson-fermion Starsmentioning

confidence: 99%

“…Four-dimensional boson-fermion stars have been studied by many authors [5]. Our threedimensional model includes an additional constant, the cosmological constant.…”

Section: Introductionmentioning

confidence: 99%

Exact solutions for boson-fermion stars in 2+1 dimensions

Sakamoto

Shiraishi

1998

Phys. Rev. D

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“…al. [6] (and further studied in [7,8]), where the fermionic matter was described by a perfect fluid with the Chandrasekhar equation of state, while the bosonic component is modeled by using a real quantized scalar field as in [9]. The bosons and the fermion particles are coupled only through gravity (notice however that non-minimal couplings with the scalar field can arise in other scenarios, such as in neutron stars with hidden extra dimensions [10] or in tensor-scalar theories of gravitation [11]).…”

Section: Introductionmentioning

confidence: 99%

Dynamical evolution of fermion-boson stars

et al. 2013

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Compact objects, like neutron stars and white dwarfs, may accrete dark matter, and then be sensitive probes of its presence. These compact stars with a dark matter component can be modeled by a perfect fluid minimally coupled to a complex scalar field (representing a bosonic dark matter component), resulting in objects known as fermion-boson stars. We have performed the dynamical evolution of these stars in order to analyze their stability, and to study their spectrum of normal modes, which may reveal the amount of dark matter in the system. Their stability analysis shows a structure similar to that of an isolated (fermion or boson) star, with equilibrium configurations either laying on the stable or on the unstable branch. The analysis of the spectrum of normal modes indicates the presence of new oscillation modes in the fermionic part of the star, which result from the coupling to the bosonic component through the gravity.

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“…Finally, we anticipate that the Newtonian approach to the boson star would be valid for a multi-scalar system with many U(1) charges, such as the 'multi-state boson star' [23], and the boson-fermion system [24][25][26][27], in order to extract its inherent characteristics in an efficient manner.…”

Section: Summary and Prospectsmentioning

confidence: 99%

Analytical approximation for Newtonian boson stars in four and five dimensions

Kan

Shiraishi

2016

Phys. Rev. D

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In this paper, we study rotating boson stars in the large coupling limit as well as in the Newtonian limit. We investigate the equilibrium solutions in four and five dimensions by adopting some analytical approximations. We show that the relations among the radius, angular momentum, Newtonian energy, and quadrupole moment (for the four-dimensional solution) of the boson star can be qualitatively realized for the minimal number of boson-star parameters.

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Combined boson-fermion stars

Cited by 78 publications

References 15 publications

Exact solutions for boson-fermion stars in 2+1 dimensions

Exact solutions for boson-fermion stars in 2+1 dimensions

Dynamical evolution of fermion-boson stars

Analytical approximation for Newtonian boson stars in four and five dimensions

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