Heavy neutron stars from light scalars

被引：4

作者：

Balkin, Reuven ^{[1
]}

Serra, Javi ^{[2
]}

Springmann, Konstantin ^{[3
]}

Stelzl, Stefan ^{[4
]}

Weiler, Andreas ^{[3
]}

机构：

[1] Technion Israel Inst Technol, Phys Dept, IL-3200003 Haifa, Israel

[2] UAM, CSIC, Inst Fis Teor, Madrid 28049, Spain

[3] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[4] Ecole Polytech Fed Lausanne, Inst Phys, Theoret Particle Phys Lab, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2025年 / 02期

基金：

瑞士国家科学基金会;

关键词：

Axions and ALPs; Finite Temperature or Finite Density; New Light Particles; ROTATING RELATIVISTIC STARS; GENERAL-RELATIVITY; MASS-DISTRIBUTION; FIELD-EQUATIONS; PULSAR; CONSERVATION; PRINCIPLE; AXIONS; BOUNDS; LIMITS;

D O I：

10.1007/JHEP02(2025)141

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study how light scalar fields can change the stellar landscape by triggering a new phase of nuclear matter. Scalars coupled to nucleons can develop a non-trivial expectation value at finite baryon density. This sourcing of a scalar reduces the nucleon mass and provides an additional energy density and pressure source. Under generic conditions, a new ground state of nuclear matter emerges, with striking implications for the configuration of stellar remnants. Notably, neutron stars in the new ground state can be significantly heavier than QCD equations of state currently predict. We also find hybrid stellar compositions and stable self-bound objects with sizes as small as the Compton wavelength of the scalar. We discuss several specific realizations of this scenario: the QCD axion and lighter generalizations thereof and linearly or quadratically coupled scalar fields effectively equivalent to a class of scalar-tensor modification of gravity. Lastly, we explore phenomenological signatures relevant to electromagnetic and gravitational wave observations of neutron stars, such as atypical compactness and instability gaps in radii.

引用

页数：54

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