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The status of cosmological natural selection
Lee Smolin
The problem of making predictions from theories that have landscapes of possible low energy parameters is reviewed. Conditions for such a theory to yield falsifiable predictions fo…
Holography and the scale-invariance of density fluctuations
Joao Magueijo, Lee Smolin, Carlo R. Contaldi
We study a scenario for the very early universe in which there is a fast phase transition from a non-geometric, high temperature phase to a low temperature, geometric phase describ…
Quantum Graphity
Tomasz Konopka, Fotini Markopoulou, Lee Smolin
We introduce a new model of background independent physics in which the degrees of freedom live on a complete graph and the physics is invariant under the permutations of all the p…
Phenomenological Quantum Gravity
S. Hossenfelder
Planck scale physics represents a future challenge, located between particle physics and general relativity. The Planck scale marks a threshold beyond which the old description of…
Could quantum mechanics be an approximation to another theory?
Lee Smolin
We consider the hypothesis that quantum mechanics is an approximation to another, cosmological theory, accurate only for the description of subsystems of the universe. Quantum theo…
Quantum gravity and the standard model
Sundance O. Bilson-Thompson, Fotini Markopoulou, Lee Smolin
We show that a class of background independent models of quantum spacetime have local excitations that can be mapped to the first generation fermions of the standard model of parti…