Next Article in Journal
A Dyna-Q-Based Solution for UAV Networks Against Smart Jamming Attacks
Next Article in Special Issue
Effect of Quantum Gravity on the Stability of Black Holes
Previous Article in Journal
Extremal Bipartite Graphs with Given Parameters on the Resistance–Harary Index
Previous Article in Special Issue
Hadronic and Hadron-Like Physics of Dark Matter
Article

The Lanczos Equation on Light-Like Hypersurfaces in a Cosmologically Viable Class of Kinetic Gravity Braiding Theories

1
Department of Theoretical Physics, University of Szeged, Tisza L. krt. 84-86, H-6720 Szeged, Hungary
2
Institute of Physics, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(5), 616; https://doi.org/10.3390/sym11050616
Received: 11 April 2019 / Accepted: 22 April 2019 / Published: 2 May 2019
(This article belongs to the Special Issue Cosmological Inflation, Dark Matter and Dark Energy)
We discuss junction conditions across null hypersurfaces in a class of scalar–tensor gravity theories (i) with second-order dynamics, (ii) obeying the recent constraints imposed by gravitational wave propagation, and (iii) allowing for a cosmologically viable evolution. These requirements select kinetic gravity braiding models with linear kinetic term dependence and scalar field-dependent coupling to curvature. We explore a pseudo-orthonormal tetrad and its allowed gauge fixing with one null vector standing as the normal and the other being transversal to the hypersurface. We derive a generalization of the Lanczos equation in a 2 + 1 decomposed form, relating the energy density, current, and isotropic pressure of a distributional source to the jumps in the transverse curvature and transverse derivative of the scalar. Additionally, we discuss a scalar junction condition and its implications for the distributional source. View Full-Text
Keywords: scalar–tensor gravity; junction conditions; null hypersurfaces scalar–tensor gravity; junction conditions; null hypersurfaces
MDPI and ACS Style

Racskó, B.; Gergely, L.Á. The Lanczos Equation on Light-Like Hypersurfaces in a Cosmologically Viable Class of Kinetic Gravity Braiding Theories. Symmetry 2019, 11, 616. https://doi.org/10.3390/sym11050616

AMA Style

Racskó B, Gergely LÁ. The Lanczos Equation on Light-Like Hypersurfaces in a Cosmologically Viable Class of Kinetic Gravity Braiding Theories. Symmetry. 2019; 11(5):616. https://doi.org/10.3390/sym11050616

Chicago/Turabian Style

Racskó, Bence, and László Á. Gergely 2019. "The Lanczos Equation on Light-Like Hypersurfaces in a Cosmologically Viable Class of Kinetic Gravity Braiding Theories" Symmetry 11, no. 5: 616. https://doi.org/10.3390/sym11050616

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop