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Charged Taub-NUT-de Sitter spacetime in DGP braneworld and its thermodynamics

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Chinese Physics C 2023年第3期47卷 252-261页

作者： haryanto m.siahaan Center for Theoretical Physics Department of PhysicsParahyangan Catholic UniversityJalan Ciumbuleuit 94Bandung 40141Indon

We study a charged Taub-NUT spacetime solution in the Dvali-Gabadadze-Porrati (DGP) brane. We show that the Reissner-Nordstrom-Taub-NUT-de Sitter solution of Einstein-maxwell gravity solves the corresponding equations of motion, where the cosmological constant is related to the cross-over scale in the DGP model. Following the approach by Teitelboim in discussing the thermodynamics of de Sitter spacetime and the proposal by Wu et al. for a conserved charge associated with the NUT parameter, we obtain the generalized Smarr mass formula and the first law of thermodynamics of the spacetime.

关键词： DGP brane Taub-NUT de Sitter thermodynamics

Hidden conformal symmetry and pair production near the cosmological horizon in Kerr-Newman-Taub-NUT-de Sitter spacetime

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Chinese Physics C 2023年第3期47卷 239-251页

作者： haryanto m.siahaan Center for Theoretical Physics Department of PhysicsParahyangan Catholic UniversityJalan Ciumbuleuit 94Bandung 40141Indonesia

We show that the study of the hidden conformal symmetry that is associated with the Kerr/CFT correspondence can also apply to the cosmological horizon in the Kerr-Newman-Taub-NUT-de Sitter *** symmetry allows employing some two dimensional conformal field theory methods to understand the properties of the cosmological *** entropy can be understood by using the Cardy formula,and the equation for the scattering process in the near region is in agreement with that obtained from a two point function in the two-dimensional conformal field *** also show that pair production can occur near the cosmological horizon in Kerr-Newman-Taub-NUT-de Sitter for near extremal conditions.

关键词： conformal symmetry Ker/CFT de Stter pair production entropy

Braneworld black holes with modmax electrodynamics on the brane

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Communications in Theoretical Physics 2024年第6期76卷 120-128页

作者： haryanto m.siahaan Jurusan Fisika Universitas Katolik ParahyanganJalan Ciumbuleuit 94Bandung 40141Indonesia

In this study,we investigate modmax electrodynamics localized within the Randall-Sundrum Ⅱ and Dvali-Gabadadze-Porrati branes,deriving corresponding 3-brane spacetime solutions that conform to the effective Einstein equations in each specific *** construct solutions for charged black holes within the effective Einstein equation framework in both braneworld *** examination explores the trajectories of charged objects in this spacetime,underscoring the significance of the nonlinear *** analysis uncovers the fact that,similar to the prior modmax black hole investigation,the nonlinear parameter plays a pivotal role in suppressing the effective charge of the black hole,due to its definite positive value.

关键词： RS-II DGP modmax brane