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Journal Articles Nucl.Phys.B Year : 2019

One-loop bosonic string and De Sitter space

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We calculate the bosonic string one-loop three- and four-point amplitudes to quadradic order in momentum, and we read off the one-loop low-energy two-derivative effective action for the massless fields, Seff . Treating the renormalized one-loop vacuum energy as a tunable parameter and extrapolating to a supercritical dimension D>26 , one can reach a regime where the one-loop couplings in Seff are of the same order as the tree-level ones while all higher-loop corrections are negligible. Moreover the effective spacetime curvature is small in string units. We show that the effective action thus obtained admits weakly-curved de Sitter solutions with constant dilaton at small string coupling.
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hal-01897220 , version 1 (20-07-2022)



Sabine Harribey, Dimitrios Tsimpis. One-loop bosonic string and De Sitter space. Nucl.Phys.B, 2019, 948, pp.114768. ⟨10.1016/j.nuclphysb.2019.114768⟩. ⟨hal-01897220⟩
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