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Phenomenological Quantum Gravity
Sabine Hossenfelder, Lee Smolin
If the history of science has taught us anything, it's that persistence and creativity makes the once impossible possible. It has long been thought experimental tests of quantum gr…
A note on the Plebanski action with cosmological constant and an Immirzi parameter
Lee Smolin, Simone Speziale
We study the field equations of the Plebanski action for general relativity when both the cosmological constant and an Immirzi parameter are present. We show that the Lagrange mult…
Prospects for constraining quantum gravity dispersion with near term observations
Giovanni Amelino-Camelia, Lee Smolin
We discuss the prospects for bounding and perhaps even measuring quantum gravity effects on the dispersion of light using the highest energy photons produced in gamma ray bursts me…
The quantization of unimodular gravity and the cosmological constant problem
Lee Smolin
A quantization of unimodular gravity is described, which results in a quantum effective action which is also unimodular, ie a function of a metric with fixed determinant. A consequ…
Disordered Locality as an Explanation for the Dark Energy
Chanda Prescod-Weinstein, Lee Smolin
We discuss a novel explanation of the dark energy as a manifestation of macroscopic non-locality coming from quantum gravity, as proposed by Markopoulou. It has been previously sug…
Time and symmetry in models of economic markets
Lee Smolin
These notes discuss several topics in neoclassical economics and alternatives, with an aim of reviewing fundamental issues in modeling economic markets. I start with a brief, non-r…
Conservative solutions to the black hole information problem
Sabine Hossenfelder, Lee Smolin
We review the different options for resolution of the black hole loss of information problem. We classify them first into radical options, which require a quantum theory of gravity…
The weak anthropic principle and the landscape of string theory
George F R Ellis, Lee Smolin
We note that there is an exception to the general arguments that no falsifiable predictions can be made, on the basis of of presently available data, by applying the weak anthropic…