Qualifications & Memberships
My interests broadly cover general relativity, quantum gravity and cosmology. Early in my career my main contributions were on gravitational aspects of higher-dimensional unified models, including so-called brane worlds, in which I was a pioneer. I have made many contributions on higher-dimensional black holes, and have also worked in quantum cosmology. More recently, I have become interested in the challenges to theoretical cosmology posed by new observations, in particular by cosmic acceleration and “dark energy”. I have revisited old assumptions concerning the operational interpretation of measurements in cosmology, and the way we average a universe, which is in fact very lumpy, with galaxy clusters strung in filaments and sheets around huge voids. “Dark energy” may in fact be a misidentification of “quasi-local gravitational energy”, an aspect of Einstein’s theory that we have yet to fully understand. I have proposed a viable alternative to the standard model - the timescape cosmology. My team and I are testing its properties. In future we aim to more deeply understand the nature of gravitational energy by rigorously construct a modified statistical geometry for the universe. The aim is to understand "dark energy" and possibly also "dark matter" as a modified geometrical theory of gravity rather than new exotic "stuff".
- Coley AA. and Wiltshire DL. (2017) What is general relativity? Physica Scripta 92(5) 053001: 10. http://dx.doi.org/10.1088/1402-4896/aa6857 or http://iopscience.iop.org/article/10.1088/1402-4896/aa6857.
- Dam LH., Heinesen A. and Wiltshire DL. (2017) Apparent cosmic acceleration from type Ia supernovae. Monthly Notices of the Royal Astronomical Society 472(1): 835-851. http://dx.doi.org/10.1093/mnras/stx1858.
- Bolejko K., Nazer MA. and Wiltshire DL. (2016) Differential cosmic expansion and the Hubble flow anisotropy. Journal of Cosmology and Astroparticle Physics (06) 035: 32. http://dx.doi.org/10.1088/1475-7516/2016/06/035.
- Buchert T., Coley AA., Kleinert H., Roukema BF. and Wiltshire DL. (2016) Observational challenges for the standard FLRW model. International Journal of Modern Physics D 25(3) 1630007: 17. http://dx.doi.org/10.1142/S021827181630007X.
- McKay JH. and Wiltshire DL. (2016) Defining the frame of minimum non-linear Hubble expansion variation. Monthly Notices of the Royal Astronomical Society 457(3): 3285-3305. http://dx.doi.org/10.1093/mnras/stw128.