350 citations · 898 across the 31 of their papers we have counts for
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Truly Lorentzian quantum cosmology
Ding Jia
Quantum cosmology based on Lorentzian path integrals is a promising avenue. However, many previous works allow non-Lorentzian configurations by integrating the squared scale factor…
Light ray fluctuation and lattice refinement of simplicial quantum gravity
Ding Jia
In several approaches of non-perturbative quantum gravity, a major outstanding problem is to obtain results valid at the infinite lattice refinement limit. Working with Lorentzian…
Is singularity resolution trivial?
Ding Jia
Many non-trivial ideas have been proposed to resolve singularities in quantum gravity. In this short note I argue that singularity resolution can be trivial in gravitational path i…
Light ray fluctuations in simplicial quantum gravity
Ding Jia
A non-perturbative study on the quantum fluctuations of light ray propagation through a quantum region of spacetime is long overdue. Within the theory of Lorentzian simplicial quan…
Complex, Lorentzian, and Euclidean simplicial quantum gravity: numerical methods and physical prospects
Ding Jia
Evaluating gravitational path integrals in the Lorentzian has been a long-standing challenge due to the numerical sign problem. We show that this challenge can be overcome in simpl…
Time-space duality in 2D quantum gravity
Ding Jia
An important task faced by all approaches of quantum gravity is to incorporate superpositions and quantify quantum uncertainties of spacetime causal relations. We address this task…