Causality in (2+1)-dimensional gravity
نویسندگان
چکیده
منابع مشابه
Causality Constrains Higher Curvature Corrections to Gravity
We show that causality constrains the sign of quartic Riemann corrections to the Einstein-Hilbert action. Our constraint constitutes a restriction on candidate theories of quantum gravity.
متن کاملEntropy Bound and Causality Violation in Higher Curvature Gravity
In any quantum theory of gravity we do expect corrections to Einstein gravity to occur. Yet, at fundamental level, it is not apparent what the most relevant corrections are. We argue that the generic curvature square corrections present in lower dimensional actions of various compactified string theories provide a natural passage between the classical and quantum realms of gravity. The Gauss-Bo...
متن کاملCausality of Massive Spin 2 Field in External Gravity
We investigate the structure of equations of motion and lagrangian constraints in the most general theory of massive spin 2 field interacting with external gravitational field. We demonstrate how consistency with the flat spacetime limit can be achieved if the external gravity fulfills vacuum Einstein equations with arbitrary cosmological constant and show that in this case there exists one-par...
متن کاملCausality and matter propagation in 3d spin foam quantum gravity
In this paper we tackle the issue of causality in quantum gravity, in the context of 3d spin foam models. We identify the correct procedure for implementing the causality/orientation dependence restriction that reduces the path integral for BF theory to that of quantum gravity in first order form. We construct explicitly the resulting causal spin foam model. We then add matter degrees of freedo...
متن کاملResolution of the causality paradox in quantum gravity
The metric determines the casual structure of spacetime, but in quantum gravity it is also a dynamical field which must be quantized using this causal structure. A radical resolution of this paradox is proposed: remove the concept of space-like separation entirely. This can be done by describing all fields in terms on p-jets, living on the observer’s trajectory; all points on the trajectory hav...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 1992
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/9/5/015