Black Hole Entropy and Holographic Entanglement Entropy in DGP Brane Gravity

@misc{kanai2026black,
  title = {{Black Hole Entropy and Holographic Entanglement Entropy in DGP Brane Gravity}},
  author = {Takamasa Kanai},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.05946},
  eprint = {2610.05946},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.05946},
}

TY  - UNPB
TI  - Black Hole Entropy and Holographic Entanglement Entropy in DGP Brane Gravity
AU  - Takamasa Kanai
PY  - 2026
DA  - 2026/10/05
PB  - arXiv
DO  - 10.48550/arxiv.2610.05946
UR  - https://arxiv.org/abs/2610.05946
AB  - We investigate the relation between gravitational entropy and holographic entanglement entropy in braneworld gravity with gravitational dynamics localized on the brane. We first consider the DGP brane model, in which an Einstein-Hilbert term is included in the brane action, and derive the condition under which the gravitational entropy of a braneworld black hole agrees with the holographic entanglement entropy. We show that the two entropies coincide when a specific condition involving the extrinsic curvature of the brane is satisfied. In particular, this condition is automatically satisfied for static configurations. We then generalize the brane-localized Einstein-Hilbert term to higher-curvature gravitational theories. For Lovelock gravity and f(R) gravity on the brane, we derive the corresponding conditions for the equality between gravitational entropy and holographic entanglement entropy and show that they take the same form as that obtained for Einstein gravity. Although the equality is not guaranteed for general stationary configurations, the required condition is satisfied for static braneworld black holes, leading to an agreement between the two entropies. These results clarify the relation between gravitational entropy and holographic entanglement entropy in braneworld gravity and contribute to a deeper understanding of holography in braneworld settings.
ER  -