PARTICLE AND QUANTUM FIELD THEORY INVESTIGATIONS

该提案涵盖了许多相互关联的主题，旨在回答理论物理学中真正的基本问题。其中包括：在大（宇宙）距离上正确的引力理论是什么？什么是量子引力？它的能量尺度是多少？黑洞是如何区分的？等级制度问题的根源和解决办法是什么？这个小组由四个理论家组成，他们分别或共同研究这些基本问题。Porrati打算对相互作用的高自旋粒子（包括有质量和无质量）的一般定理进行系统的研究。他建议扩展先前关于重力反作用效应的结果，以了解它们在短距离和长距离上的影响。他将与G。Dvali和G. Gabadadze理解IR修正引力以及标准广义相对论的动力学。Porrati将利用他在弦理论方面的专业知识和他过去在AdS/CFT对偶性方面的工作来研究更简单的、潜在可解的低维量子引力模型。Gabadadze正计划在引力的大距离修正范式内处理宇宙学常数问题和宇宙加速度问题。他将：寻找导致加速膨胀的膜诱导引力模型。Sirlin计划继续研究精确电弱物理学的几个方面以及量子场论中的相关概念，并寻求超越标准模型的新物理学的信号和边界。 Dvali的研究将集中在识别和研究标准模型之外的新物理学，包括宇宙学和粒子物理学。他感兴趣的是稳定弱尺度机制背后的动力学将如何对LHC物理学产生影响（例如，迷你黑洞的产生）。他还对引力理论感兴趣，这些理论提供了长距离的新物理学，一方面可以解释宇宙的加速膨胀，另一方面可以有可检验的实验结果。PI参与了与纽约大学教育学院合作的各种推广项目。他们还举办通俗讲座，充当拉丁美洲学生的联络人，并撰写科普文章。

This proposal covers many interrelated topics aiming to answer truly fundamental questions in theoretical physics. Among them: what is the correct gravity theory at large (cosmic) distances? What is quantum gravity? What is its energy scale? How (in)distinguishable are black holes? What is the origin of and solution to the hierarchy problem? The group consists of four theorists who work both separately and together on these fundamental questions. Porrati intends to undertake a systematic study of general theorems on interacting high-spin particles, both massive and massless. He proposes to extend previous results on back-reaction effects of gravity to understand their effects at short and large distances. He will work with G. Dvali and G. Gabadadze to understand the dynamics of IR modified gravity as well as of standard General Relativity. Porrati will use his expertise in string theory, and his past work on the AdS/CFT duality to study simpler,potentially soluble models of quantum gravity in lower dimension.Gabadadze is planning to approach the cosmological constant problem, and the issue of cosmic acceleration within the paradigm of large distance modification of gravity. He will: search for brane induced gravity models that lead to an accelerated expansion. Sirlin plans to continue his studies of several aspects of precision electroweak physics and related concepts in Quantum Field Theory, and to pursue the search of signals and bounds for new physics beyond the Standard Model. Dvali's research will focus on identifying and studying the new physics beyond the Standard Model, both in cosmology and particle physics. He is interested in how the dynamics behind the mechanism of stabilizing the weak scale will have consequences for LHC physics (such as, for example, production of mini black holes). He is also interested in theories of gravity that provide new physics at long distances, that on the one hand could explain the accelerated expansion of the Universe, and on the other can have testable experimental consequences.The PIs are involved in working with the NYU School of education on various outreach projects. They also give popular lectures, serve as liaisons with Latin-American students and write popular science articles.