Δ重子伪装：在中子星物质中的内涵相变及其夸克模仿特征
The Delta-isobar masquerade: intrahadronic phase transitions and their quark-mimicking signatures in neutron stars
AI总结：
研究通过Δ重子机制在中子星内部引发相变，揭示其可模拟夸克物质特征，扩展了伪装问题至引力波震颤学领域。
摘要：
我们研究了在纯强子性中子星物质中，Δ(1232)同位素引发一级相变的条件，使用SW4L相对论平均场参数化方法。对于标量-向量耦合差异0.15≤x_{σΔ} - x_{ωΔ}≤0.2和x_{σΔ}≥1.3，Δ^-共振的出现会产生一种类似于范德瓦尔不稳定的机制，该机制由标量介子领域的自放大反馈驱动，其中Δ^-粒子分数作为Landau型相变的序参量。Maxwell构造得出在重子密度n_b≈(1.3-2)n_0处存在明显的密度不连续性，将Δ-自由外核与Δ-丰富的内核分隔开。由此产生的中子星序列满足所有当前多信使约束：最大质量M_max≈2.15-2.25M_⊙，半径R_{1.4}≈11-12km，以及潮汐变形度Λ_{1.4}≈190-480，与NICER观测和GW170817兼容。我们首次计算了由Δ诱导界面的ℓ=2组成g-模特征频率，得到ν_g≈400-1100Hz，引力波阻尼时间τ_g≈10^3-10^9s。这些频率与预测的强子-夸克相变界面的频率定量重叠，证明了质量-半径“膝”、减少的潮汐变形度和g-模光谱通常被认为是夸克去束缚特征的可以由纯内涵机制重现。这将伪装问题从静态可观测到引力波天体震颤学领域，意味着未来检测到断层g-模单独不足够识别中子星核心的夸克物质。
英文摘要：
We investigate the conditions under which $Δ(1232)$ isobars trigger a first-order phase transition within purely hadronic neutron-star matter, using the SW4L relativistic mean-field parametrization. For scalar-vector coupling differences $0.15 \lesssim x_{σΔ} - x_{ωΔ} \lesssim 0.2$ and $x_{σΔ} \gtrsim 1.3$, the onset of $Δ^-$ resonances produces a van der Waals-like instability driven by a self-amplifying feedback in the scalar meson sector, in which the $Δ^-$ particle fraction acts as the order parameter of a Landau-type transition. A Maxwell construction yields a sharp density discontinuity at baryon densities $n_b \sim (1.3$-$2)\,n_0$, separating a $Δ$-free outer core from a $Δ$-rich inner core. The resulting neutron-star sequences satisfy all current multimessenger constraints: maximum masses $M_{\rm max} \approx 2.15$-$2.25\,M_\odot$, radii $R_{1.4} \approx 11$-$12$ km, and tidal deformabilities $Λ_{1.4} \approx 190$-$480$, compatible with NICER observations and GW170817. We compute, for the first time for a $Δ$-induced interface, the $\ell = 2$ composition $g$-mode eigenfrequencies, obtaining $ν_g \sim 400$-$1100$ Hz with gravitational-wave damping times $τ_g \sim 10^3$-$10^9$ s. These frequencies overlap quantitatively with those predicted for hadron-quark phase-transition interfaces, demonstrating that the mass-radius ``knee'', reduced tidal deformability, and $g$-mode spectrum conventionally regarded as signatures of quark deconfinement can be reproduced by a purely intrahadronic mechanism. This extends the masquerade problem from static observables to the domain of gravitational-wave asteroseismology, implying that a future detection of a discontinuity $g$-mode alone would not suffice to identify quark matter in neutron-star cores.
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