从奇异夸克物质中子星诞生时诱发的脉冲星踢速度估算中微子磁矩

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Universe Pub Date : 2024-07-20 DOI:10.3390/universe10070301
Alejandro Ayala, Santiago Bernal-Langarica, Daryel Manreza-Paret
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引用次数: 0

摘要

我们通过计算奇异夸克物质中子星诞生时内核中可能发生的中微子奇异性翻转率来估计电子中微子的磁矩。我们表明,这一过程允许中微子各向异性地逃逸,从而诱发了恒星的踢速度。虽然从左手中微子到右手中微子的翻转过程被假定为在平衡状态下发生,但由于右手中微子不与物质发生相互作用,反向过程不会发生,从而导致详细平衡的丧失,因此不成功定理并不适用。为简单起见,我们将恒星内核模拟为由奇异夸克物质组成。我们发现,即使右旋中微子释放的能量只是左旋中微子释放的总能量的一小部分,该过程描述的原生条件下的踢速度也与观测到的速度一致,并且跨越了典型磁场强度的正确半径、温度和化学势范围。中微子磁矩估计为μν∼3.6×10-18μB,其中μB是玻尔磁子。这个值比标准模型最小扩展中对大质量中微子的约束更为严格。
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Estimate for the Neutrino Magnetic Moment from Pulsar Kick Velocities Induced at the Birth of Strange Quark Matter Neutron Stars
We estimate the magnetic moment of electron neutrinos by computing the neutrino chirality flip rate that can occur in the core of a strange quark matter neutron star at birth. We show that this process allows neutrinos to anisotropically escape, thus inducing the star kick velocity. Although the flip from left- to right-handed neutrinos is assumed to happen in equilibrium, the no-go theorem does not apply because right-handed neutrinos do not interact with matter and the reverse process does not happen, producing the loss of detailed balance. For simplicity, we model the star core as consisting of strange quark matter. We find that even when the energy released in right-handed neutrinos is a small fraction of the total energy released in left-handed neutrinos, the process describes kick velocities for natal conditions, which are consistent with the observed ones and span the correct range of radii, temperatures and chemical potentials for typical magnetic field intensities. The neutrino magnetic moment is estimated to be μν∼3.6×10−18μB, where μB is the Bohr magneton. This value is more stringent than the bound found for massive neutrinos in a minimal extension of the standard model.
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来源期刊
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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