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General relativity with a topological phase: an action principle
Lee Smolin, Artem Starodubtsev
An action principle is described which unifies general relativity and topological field theory. An additional degree of freedom is introduced and depending on the value it takes th…
Quantum Theory from Quantum Gravity
Fotini Markopoulou, Lee Smolin
We provide a mechanism by which, from a background independent model with no quantum mechanics, quantum theory arises in the same limit in which spatial properties appear. Starting…
The linearization of the Kodama state
Laurent Freidel, Lee Smolin
We study the question of whether the linearization of the Kodama state around classical deSitter spacetime is normalizable in the inner product of the theory of linearized graviton…
Quantum Gravity and Inflation
Stephon Alexander, Justin Malecki, Lee Smolin
Using the Ashtekar-Sen variables of loop quantum gravity, a new class of exact solutions to the equations of quantum cosmology is found for gravity coupled to a scalar field, that…
2+1 gravity and Doubly Special Relativity
Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin
It is shown that gravity in 2+1 dimensions coupled to point particles provides a nontrivial example of Doubly Special Relativity (DSR). This result is obtained by interpretation of…
Quantum symmetry, the cosmological constant and Planck scale phenomenology
Giovanni Amelino-Camelia, Lee Smolin, Artem Starodubtsev
We present a simple algebraic argument for the conclusion that the low energy limit of a quantum theory of gravity must be a theory invariant, not under the Poincare group, but und…
Gravity's Rainbow
Joao Magueijo, Lee Smolin
Non-linear special relativity (or doubly special relativity) is a simple framework for encoding properties of flat quantum space-time. In this paper we show how this formalism may…
How far are we from the quantum theory of gravity?
Lee Smolin
An assessment is offered of the progress that the major approaches to quantum gravity have made towards the goal of constructing a complete and satisfactory theory. The emphasis is…