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Open Access4D spherically symmetric time-dependent quantum gravity amplitudes
In these short notes, we compute non-perturbatively the time-dependent quantum gravity amplitudes for a four-dimensional spherically symmetric space-time with space-like and time-like boundaries. We solve the ...
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Open AccessQuantum gravity on a manifold with boundaries: Schrödinger evolution and constraints
In this work, we derive the boundary Schrödinger (functional) equation for the wave function of a quantum gravity system on a manifold with boundaries together with a new constraint equation defined on the tim...
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Open AccessSchwarzschild black hole states and entropies on a nice slice
In this work, we define a quantum gravity state on a nice slice. The nice slices provide a foliation of spacetime and avoid regions of strong curvature. We explore the topology and the geometry of the manifold...
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Open AccessSpontaneous symmetry breaking in tensor theories
In this work we study spontaneous symmetry breaking patterns in tensor models. We focus on the patterns which lead to effective matrix theories transforming in the adjoint of U(N). We find the explicit form of th...
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Article
Open AccessA string theory which isn’t about strings
Quantization of closed string proceeds with a suitable choice of worldsheet vacuum. A priori, the vacuum may be chosen independently for left-moving and right-moving sectors. We construct ab initio quantized boso...
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Article
Open AccessGauge symmetry enhancing-breaking from a Double Field Theory perspective
Gauge symmetry enhancing, at specific points of the compactification space, is a distinguished feature of string theory. In this work we discuss the breaking of such symmetries with tools provided by Double Fi...
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Open AccessEnhanced gauge symmetry and winding modes in double field theory
We provide an explicit example of how the string winding modes can be incorporated in double field theory. Our guiding case is the closed bosonic string compactified on a circle of radius close to the self-dua...
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Article
Open AccessOn the exceptional generalised Lie derivative for d ≥ 7
In this work we revisit the E 8 ...
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Open AccessE8 geometry
We investigate exceptional generalised diffeomorphisms based on E8(8) in a geometric setting. The transformations include gauge transformations for the dual gravity field. The surprising key result, which allows ...
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Open AccessThe gauge structure of exceptional field theories and the tensor hierarchy
We address the construction of manifest U-duality invariant generalized diffeomorphisms. The closure of the algebra requires an extension of the tangent space to include a tensor hierarchy indicating the exist...
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Open AccessExtended geometry and gauged maximal supergravity
We consider generalized diffeomorphisms on an extended mega-space associated to the U-duality group of gauged maximal supergravity in four dimensions, E 7(7). Through the bein for the extended met...
