Screening mechanisms are a natural method for suppressing long-range forces in scalar-tensor theories as they link the local background density to their strength. Focusing on Brans-Dicke theories, those including a non-minimal coupling between a scalar degree of freedom and the Ricci scalar, we study the origin of these screening mechanisms from a field theory perspective, considering the influence of the Standard Model on the mechanisms. Additionally, we further consider the role of scale symmetries on screening, demonstrating that only certain sectors, those obtaining their mass via the Higgs mechanism, contribute to screening the fifth forces. This has significant implications for baryons, which obtain most of their mass from the gluon's binding energy. Given that the Planck mass is related to the vacuum expectation value of the non-minimally coupled field, we find an extensive region of the parameter space where screening mechanisms create a spatially dependent gravitational constant. We say that the field over-screens when this effect is more significant than the fifth forces suppressed by screening mechanisms, as we illustrate for the chameleon and symmetron models.
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）
Color screening versus thermal decay as the mechanism of $Υ$ suppression in high energy nuclear collisions
Tianjin University（天津大学）；Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Physics, Campus Frankfurt（黑森亥姆霍兹FAIR研究院，GSI重离子物理中心法兰克福校区）；Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität（约翰·沃尔夫冈·歌德大学理论物理研究所）；Yantai University（烟台大学）；Tsinghua University（清华大学）；South Center for Nuclear-Science Theory, Institute of Modern Physics, Chinese Academy of Sciences（中国科学院现代物理研究所核科学理论南方中心）
QCD phase diagram in a magnetized medium from the chiral symmetry perspective: The linear sigma model with quarks and the Nambu--Jona-Lasinio model effective descriptions
