The Role of Longitudinal Polarizations in Horndeski and Macroscopic Gravity: Introducing Gravitational Plasmas

被引:9
作者
Moretti, Fabio [1 ]
Bombacigno, Flavio [2 ,3 ]
Montani, Giovanni [1 ,4 ]
机构
[1] Sapienza Univ Rome, Dept Phys, Ple Aldo Moro 5, I-00185 Rome, Italy
[2] Univ Valencia, Dept Fis Teor, Ctr Mixto Univ Valencia CSIC, Valencia 46100, Spain
[3] Univ Valencia, IFIC, Ctr Mixto Univ Valencia CSIC, Valencia 46100, Spain
[4] ENEA, Fus & Nucl Safety Dept, CR Frascati, Via E Fermi 45, I-00044 Rome, Italy
关键词
gravitational waves; gauge-invariant method; Landau damping; macroscopic gravity; GENERAL-RELATIVITY; DARK ENERGY; BLACK-HOLES; WAVES; TENSOR; PROPAGATION; DISPERSION; PARTICLES; EQUATIONS; BOUNCE;
D O I
10.3390/universe7120496
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss some general and relevant features of longitudinal gravitational modes in Horndeski gravity and their interaction with matter media. Adopting a gauge-invariant formulation, we clarify how massive scalar and vector fields can induce additional transverse and longitudinal excitations, resulting in breathing, vector, and longitudinal polarizations. We review, then, the interaction of standard gravitational waves with a molecular medium, outlining the emergence of effective massive gravitons, induced by the net quadrupole moment due to molecule deformation. Finally, we investigate the interaction of the massive mode in Horndeski gravity with a noncollisional medium, showing that Landau damping phenomenon can occur in the gravitational sector as well. That allows us to introduce the concept of "gravitational plasma", where inertial forces associated with the background field play the role of cold ions in electromagnetic plasma.
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页数:28
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