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ProfessorDavid Wiltshire

Physics 714
Internal Phone: 95128

Qualifications & Memberships

Research Interests

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".

Research/Scholarly/Creative Works

  • Coley AA. and Wiltshire DL. (2017) What is general relativity? Physica Scripta 92(5)
  • Bolejko K., Nazer MA. and Wiltshire DL. (2016) Differential cosmic expansion and the Hubble flow anisotropy. Journal of Cosmology and Astroparticle Physics (6) ARTN 035 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) ARTN 1630007 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.
  • Buchert T., Carfora M., Ellis GFR., Kolb EW., MacCallum MAH., Ostrowski JJ., Rasanen S., Roukema BF., Andersson L. and Coley AA. (2015) Is there proof that backreaction of inhomogeneities is irrelevant in cosmology? Classical and Quantum Gravity 32(21) ARTN 215021 http://dx.doi.org/10.1088/0264-9381/32/21/215021.