Probing Quantum Gravity

Dear Colleagues,

Experimental and observational tests are key in any area of physics, including quantum gravity, where the difference in scales between the Planck scale and directly accessible energy scales poses a well-known challenge to attempts that bridge the gap between theory development and observations.
Nevertheless, promising ideas to bridge that gap have been developed in the last few years, including:

• Effects of quantum gravity in the early universe, for instance, implications for the cosmic microwave background
• Constraints on quantum gravity arising in the late universe, e.g., regarding the implications of (dynamical) dark energy for quantum gravity
• Understanding restrictions on particle physics that arise from a given underlying microphysics including quantum gravity
• Tests making use of the strong gravity regime now accessible through gravitational wave observations and images of black holes, to constrain potential (non-local) effects from quantum gravity, e.g., in black hole spacetimes
• Novel ideas to test the effects of (classical) gravity in (table-top) experiments with quantum system,s as a step forward in understanding the interplay of gravity and quantum physics

This feature paper collection will provide a broad overview of the current status and future prospects of probes of quantum gravity. Contributions are invited from all theoretical approaches to quantum gravity, as well as from a perspective focused on experiments/observations, where novel opportunities for quantum gravity could arise. In particular, contributions that bridge (perceived) boundaries between fields are very highly welcomed!

Prof. Dr. José Velhinho
Collection Editors

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