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29/06/2026, 15:501
Metric affine gravity (MAG) represents an extension of general relativity (GR) in which the metric and affine connection are independent geometrical variables. This leads to two, in addition to curvature, tensors describing the geometry of spacetime, torsion and nonmetricity. And a new tensor describing its matter content together with the stress energy tensor, the hypermomentum tensor. I will...
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29/06/2026, 16:15
In this talk, I will discuss how a small anisotropic “solid remnant” left over after inflation could affect the early Universe. This model is inspired by solid inflation and its generalizations, in which matter is described by a triplet of fields. In our model, the full internal global Euclidean symmetry of this triplet is broken, leading to anisotropic expansion of the Universe. Superhorizon...
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29/06/2026, 16:40
Scalar-tensor theories of gravity are known to generically admit an effective imperfect fluid description, which leads to a natural interpretation of GR as a state of thermal equilibrium. In particular, it is possible to assign a temperature to nonminimally coupled fields, which increases as the theory deviates from GR. However, this temperature is conformally dependent, and can be arbitrarily...
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29/06/2026, 17:05
Physical processes (including field interactions and cosmological evolution) might have different interpretations in different conformal frames. In this talk, we shall discuss how to consistently transform dissipative phenomena between distinct conformal-frame representations of scalar-tensor gravity, and explore the observable consequences thereof in warm inflation scenarios, where the...
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