In bouncing cosmological backgrounds, event and particle horizons can appear or disappear independently of the local expansion rate because they are determined by the full spacetime history.
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In O(d,d) symmetric gravity with curvature corrections, black brane singularities are not resolved but approach with altered Kasner exponents, while a dilaton generates negative cosmological constants at small coupling.
The work analyzes the dual geometry of charged black holes in a T-duality invariant heterotic string theory in two dimensions and extends a prior non-perturbative solution to multiple abelian gauge fields.
citing papers explorer
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Cosmological horizons in regular bouncing backgrounds
In bouncing cosmological backgrounds, event and particle horizons can appear or disappear independently of the local expansion rate because they are determined by the full spacetime history.
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$O(d,d)$ symmetric gravity and finite coupling holography
In O(d,d) symmetric gravity with curvature corrections, black brane singularities are not resolved but approach with altered Kasner exponents, while a dilaton generates negative cosmological constants at small coupling.
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Heterotic Black Holes in Duality-Invariant Formalism
The work analyzes the dual geometry of charged black holes in a T-duality invariant heterotic string theory in two dimensions and extends a prior non-perturbative solution to multiple abelian gauge fields.