TL;DR
This paper reviews three critical issues—ghosts, cosmological crashes, and vacuum instability—in the DGP braneworld model, challenging its viability as an alternative to dark energy for late-time cosmic acceleration.
Contribution
It identifies and discusses three fundamental flaws in the DGP model, providing a critical assessment of its theoretical consistency.
Findings
DGP model suffers from ghost instabilities.
The model encounters cosmological crashes.
Vacuum stability is compromised in the DGP framework.
Abstract
In this talk I review three fatal flaws of the DGP braneworld model, which has been put forward as a possible model for late time acceleration without a cosmological constant: Ghosts, Cosmological Crashes, and Instability of the 5D vacuum. The talk is based on work in collaboration with Charmousis, Kaloper, Myers and Padilla.
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