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16 papers · 1 filter
f(R) Gravities, Killing Spinor Equations, "BPS" Domain Walls and Cosmology
Haishan Liu, H. Lu, Zhao-Long Wang
We derive the condition on f(R) gravities that admit Killing spinor equations and construct explicit such examples. The Killing spinor equations can be used to reduce the fourth-or…
Solutions of Free Higher Spins in AdS
H. Lu, Kai-Nan Shao
We consider free massive and massless higher integer spins in AdS backgrounds in general D dimensions. We obtain the solutions corresponding to the highest-weight state of the spin…
Isometric embedding of negatively curved complete surfaces in Lorentz-Minkowski space
Bing-Long Chen, Le Yin
Hilbert-Efimov theorem states that any complete surface with curvature bounded above by a negative constant can not be isometrically imbedded in We demonstrate that…
Non-memoryless Analog Network Coding in Two-Way Relay Channel
Shengli Zhang, Soung-Chang Liew, Qingfeng Zhou +2
Physical-layer Network Coding (PNC) can significantly improve the throughput of two-way relay channels. An interesting variant of PNC is Analog Network Coding (ANC). Almost all ANC…
Blind Known Interference Cancellation
Shengli Zhang, Soung-Chang Liew, Hui Wang
This paper investigates interference-cancellation schemes at the receiver, in which the original data of the interference is known a priori. Such a priori knowledge is common in wi…
Linearized Modes in Extended and Critical Gravities
Yi-Xin Chen, H. Lu, Kai-Nan Shao
We construct explicit solutions for the linearized massive and massless spin-2, vector and scalar modes around the AdS spacetimes in diverse dimensions. These modes may arise in ex…