We explore scalar radiation from neutron star-black hole binaries in scalar-tensor theories with kinetic screening ($K$-essence). Using 3+1 numerical relativity simulations in the decoupling limit, we investigate scalar dipole and quadrupole radiation for different values of the strong coupling constant $Λ$. Our results show that kinetic screening effectively suppresses the scalar dipole radiation as $Λ$ decreases. This is validated by comparing to analytic predictions for the screening of dipole scalar emission, with which our numerical results show good agreement. However, our numerical simulations show that the suppression of scalar quadrupole radiation is less efficient, even when the screening radius exceeds the wavelength of the emitted radiation. In fact, the dependence of the scalar quadrupole amplitude on $Λ$ flattens out for the smallest $Λ$ that we can simulate, and the quadrupole amplitude is suppressed only by a factor $\lesssim 3$ relative to the Fierz-Jordan-Brans-Dicke case. Overall, our study shows that scalar quadrupole radiation from mixed binaries may be used to place constraints on $K$-essence theories with next-generation gravitational-wave detectors.
Primary black-hole scalar charges and kinetic screening in $K$-essence-Gauss-Bonnet gravity
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））；CEICO, Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所 CEICO）；Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS)（基础科学研究所宇宙理论物理中心）；Centro Atómico Bariloche and CONICET（巴里洛切原子能中心和阿根廷国家科学研究委员会）
Scalar emission from binary neutron stars in scalar-tensor theories with kinetic screening
SISSA（的里雅斯特国际高等研究学院）；INFN Sezione di Trieste（意大利国家核物理研究所的里雅斯特分部）；IFPU - Institute for Fundamental Physics of the Universe（宇宙基础物理研究所）；CENTRA, Departamento de Fisica, Instituto Superior Técnico – IST, Universidade de Lisboa – UL（里斯本大学技术学院物理系中心天体物理学与理论研究组）；Center for Gravitation, Cosmology and Astrophysics, Department of Physics & Astronomy, University of Wisconsin-Milwaukee（威斯康星大学密尔沃基分校引力、宇宙学与天体物理中心）；Nottingham Centre of Gravity（诺丁汉重力研究中心）；School of Mathematical Sciences, University of Nottingham（诺丁汉大学数学科学学院）
Multi-Field Dilaton Screening Beyond the Thin-Shell Mechanism
Institut de Physique Théorique, Université Paris-Saclay（巴黎萨克雷大学理论物理研究所）；School of Mathematical and Physical Sciences, University of Sheffield（谢菲尔德大学数学与物理科学学院）；DAMTP & Kavli Institute of Cosmology (KICC), Cambridge University（剑桥大学应用数学与理论物理系及卡弗里宇宙学研究所）
Constraints of general screened modified gravities from comprehensive analysis of binary pulsars
利用双星系统进行重力测量已成为当前的一个重要课题。屏蔽修正引力理论是一种具有屏蔽机制的标量-张量理论，以满足严格的太阳系实验要求。本文研究了屏蔽机制对双星轨道动力学的影响，并详细计算了屏蔽机制中的五个后开普勒（PK）参数。这些参数不同于广义相对论（GR）的参数，并且这些差异被标量电荷量化，这导致了该理论中的偶极辐射。我们分别结合了十个二元双星的PK参数的观测值，中子星（NS）-白矮星（WD）双星中的偶极辐射导致了对GR偏差的更严格的约束。对NS和WD标量电荷最严格的约束系统是PSR~ B 1913 $+$ 16和PSR ~ B 1913。J1738 $+$ 0333。所有的测试结果排除了显着的强场偏差，并显示出良好的协议与GR。
