The Cosmological Slingshot Scenario: a Stringy Proposal for the Early Time Cosmology

Understand

In the Cosmological Slingshot Scenario, our Universe is a D3-brane that extends in the 4d noncompact directions of a warped Calabi-Yau compactification of IIB Supergravity.

• Early time cosmology corresponds to a period in which the brane moves inside a warped throat where a non-vanishing angular momentum ensures that the trajectory of the brane has a turning point.
• The corresponding induced metric on the D3-brane experiences a cosmological evolution with a bounce.
• In this framework, the homogeneity, flatness, and isotropy problems of standard cosmology might be avoided.