Stable neutral Fermi ball

Ogure, Kenzo; Yoshida, Tetsuya; Arafune, J.

doi:10.1103/physrevd.67.123518

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…The Gaussian approximation [24] in 3+1 dimensions gives the same result. However, the renormalization group approach applied to the linear sigma model [25,26] indicates that the phase transition is of second order. Arnold and Espinosa [27] pointed out that loop diagrams other than superdaisy ones are important near critical temperature.…”

Section: The Higher-loop Diagrams Contributionmentioning

confidence: 99%

On the chiral phase transition in the linear sigma model

2004

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The Cornwall-Jackiw-Tomboulis (CJT) effective action for composite operators at finite temperature is used to investigate the chiral phase transition within the framework of the linear sigma model as the low-energy effective model of quantum chromodynamics (QCD). A new renormalization prescription for the CJT effective action in the Hartree-Fock (HF) approximation is proposed. A numerical study, which incorporates both thermal and quantum effect, shows that in this approximation the phase transition is of first order. However, taking into account the higher-loop diagrams contribution the order of phase transition is unchanged.

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Section: The Higher-loop Diagrams Contributionmentioning

confidence: 99%

On the chiral phase transition in the linear sigma model

2004

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“…We, however, pointed out that the perturbative correction due to the domain wall curvature can stabilize the Fermi ball when the volume energy is small enough compared to the curvature effect [6,7]. In case of a simple model with a single fermion flavor, we found that only in the quite narrow region of the parameters does the Fermi ball become stable.…”

Section: Introductionmentioning

confidence: 87%

“…This leads us to the fact that except for the special case of N (a) i = c (a) N i , state A has lower energy than that of state B, and thus the Fermi ball is stable against the fragmentation in the leading order approximation. This situation that the Fermi ball is stable in most cases is characteristic of the case with multi-flavor of fermions, and qualitatively different from the case of a single flavor [7]. In case of N (a) i = c (a) N i , the two states have the same energy in the leading order approximation, and the correction term δE determines the stability of the Fermi ball against the fragmentation.…”

Section: Stability Of Fermi Ballmentioning

confidence: 93%

Stability of neutral Fermi balls with multiflavor fermions

2003

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A Fermi ball is a kind of nontopological soliton which is thought to arise from the spontaneous breaking of an approximate Z 2 symmetry and to contribute to cold dark matter. We consider a simple model in which fermion fields with multiflavors are coupled to a scalar field through Yukawa coupling and examine how the number of the fermion flavors affects the stability of the Fermi ball against the fragmentation. ͑1͒ We find that the Fermi ball is stable against fragmentation in most cases even in the lowest-order thin-wall approximation. ͑2͒ We then find that in the other specific cases the stability is marginal in the lowest-order thin-wall approximation, and the next-to-leading order correction determines the stable region of the coupling constants; we examine the simplest case where the total fermion number N i and the Yukawa coupling constant G i of each flavor i are common to the flavors, and find that the Fermi ball is stable in a limited region of the parameters and has the broader region for the larger number of flavors.

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“…In the top frame, sensor separation is 1 mm and in the bottom frame the sensor mass is 1 g, both for a dark matter mass of Mp. models with flat field-directions in their potential [51][52][53][54][55][56][57][58][59] such as models with scalar fields carrying a conserved-U(1) charge. These charge-carrying field configurations can be produced through phase transitions [60] in the early universe via the fragmentation of scalar condensates and could be a by-product of baryogenesis [61][62][63].…”

Section: Models and Relevant Parameter Spacementioning

confidence: 99%

Models of ultra-heavy dark matter visible to macroscopic mechanical sensing arrays

Blanco,

Elshimy,

Lang

et al. 2021

Preprint

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In recent years, the sensitivity of opto-mechanical force sensors has improved leading to increased interest in using these devices as particle detectors. In this study we consider scenarios where dark matter with mass close to the Planck scale may be probed by a large array of opto-mechanical accelerometers. We motivate a macroscopic mechanical search for ultra-heavy dark matter, exemplified by the efforts of the Windchime collaboration, by providing a survey of the model space that would be visible to such a search. We consider two classes of models, one that invokes a new long-range unscreened force and another that is only gravitationally interacting. We identify significant regions of well-motivated, potentially visible parameter space for versatile models such as Q-balls, composite dark matter, relics of gravitational singularities, and gravitationally produced ultra-heavy particles.

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Stable neutral Fermi ball

Cited by 7 publications

References 17 publications

On the chiral phase transition in the linear sigma model

On the chiral phase transition in the linear sigma model

Stability of neutral Fermi balls with multiflavor fermions

Models of ultra-heavy dark matter visible to macroscopic mechanical sensing arrays

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