ScholarBank@NUShttps://scholarbank.nus.edu.sgThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Wed, 08 Dec 2021 07:50:46 GMT2021-12-08T07:50:46Z5031- Gravitational lensing in conformal and emergent gravityhttps://scholarbank.nus.edu.sg/handle/10635/206478Title: Gravitational lensing in conformal and emergent gravity
Authors: Lim, Y.-K.; Wang, Q.-H.
Editors: Yang, A.; Wang, W.Y.; Ng, S.C.C.; Chan, A.H.; Oh, C.H.; Phua, K.K.
Abstract: The gravitational bending of light in the framework of conformal gravity is considered where an exact solution for null geodesics in the Mannheim-Kazanas is obtained. The linear coefficient ? characteristic to conformal gravity is shown to contribute enhanced deflection compared to the angle predicted by General Relativity for small ?. We also briefly consider gravitational lensing in covariant emergent gravity. © The Authors, published by EDP Sciences.
Mon, 01 Jan 2018 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/2064782018-01-01T00:00:00Z
- New form of the C metric with cosmological constanthttps://scholarbank.nus.edu.sg/handle/10635/128001Title: New form of the C metric with cosmological constant
Authors: Chen Y.; Lim Y.-K.; Teo E.
Thu, 01 Jan 2015 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/1280012015-01-01T00:00:00Z
- Warped branches of flux compactificationshttps://scholarbank.nus.edu.sg/handle/10635/125040Title: Warped branches of flux compactifications
Authors: Lim, Y.-K.
Abstract: We consider Freund-Rubin-type compactifications which are described by (p+q)-dimensional Einstein gravity with a positive cosmological constant and a q-form flux. Using perturbative expansions of Kinoshita's ansatz for warped dS p×Sq and AdS p×Sq spacetimes, we obtain analytical solutions describing the warped branches and their respective phase spaces. These equations are given by inhomogeneous Gegenbauer differential equations which can be solved by the Green's function method. The requirement that the Green's functions are regular provides constraints which determine the structure of the phase space of the warped branches. We apply the perturbation results to calculate the thermodynamic variables for the warped dS p×Sq branch. In particular, the first law of thermodynamics can be reproduced using this method. © 2012 American Physical Society.
Tue, 20 Mar 2012 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/1250402012-03-20T00:00:00Z