GeomGravX: 10 Years of Geometric Foundations of Gravity and eXtensions (in Tartu)

Session

Monday Parallel B2

29 Jun 2026, 15:50

A106 (Physicum, University of Tartu)

91. Lucy Zheng: Space-time structure and phenomenology of Cartan Khronon theory

29/06/2026, 15:50

1

Cartan Khronon framework provides a foundation for unconventional space-time structure with a clock field, dubbed ‘khronon’, which spontaneously breaks the symmetry between space and time. This allows gravitational theory to have a Spin(4) gauge structure with a Euclidean background. This talk aims to clarify the motivation for the Euclidean background, the procedure of dimensional Wick...

90. Stylianos Papadopoulos: Gravitational Instantons and Chiral Reduction in Spin(4) Gauge theory of space-time.

29/06/2026, 16:15

1

In this talk, the Spin(4) gauge formulation of spacetime with a Cartan khronon field is presented. As motivation, the relation between Euclidean and Lorentzian descriptions is recalled as a Wick-rotation prescription relating two dynamically equivalent descriptions of the same underlying field configurations, once a time direction is selected by the Cartan khronon. Within this setting, the...

92. Priidik Gallagher: A practical guide to unifying the Khronon

29/06/2026, 16:40

A review of the question how to put the Cartan Khronon into a gauge-gravity unified field theory is provided. The issues are several-fold, from conceptual to technical: suggestions for future developments are provided. The Cartan Khronon is quite special in its particular balance of self-dual Einstein-Cartan gravity constrained to waywiser form, thus producing ideal dust. However, supplying...

93. Mehraveh Nikjoo: Emulator-Assisted Investigation of Left-Right Symmetric Higgs Inflation

29/06/2026, 17:05

This work investigates inflation in a left-right symmetric extension of Higgs inflation, formulated in a first-order gravitational framework. Specializing to a single-field inflationary trajectory, the model admits two physically distinct cases: real , associated with complex-conjugate non-minimal couplings, and purely imaginary , associated with real non-minimal couplings.
We explore the...

21. Space-time structure and phenomenology of Cartan Khronon theory

Lucy Zheng (University of Tartu)

Oral talk

Cartan Khronon framework provides a foundation for unconventional space-time structure with a clock field, dubbed ‘khronon’, which spontaneously breaks the symmetry between space and time. This allows gravitational theory to have a Spin(4) gauge structure with a Euclidean background. This talk aims to clarify the motivation for the Euclidean background, the procedure of dimensional Wick...