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Since Stephen Hawking discovered that black holes emit thermal radiation,
black holes have become the theoretical laboratories for testing our ideas on
quantum gravity. This dissertation is devoted to the study of singularities,
the formation of black holes by gravitational collapse and the global structure
of spacetime. All our investigations are...
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Citations
... In addition, spherically symmetric spacetimes without/with the presence of matter were also investigated [122][123][124], and was found that the solar system tests can be satisfied by properly choosing the coupling constants of the theory. ...
... Since they were first discovered in [203,217], universal horizons have been studied intensively, and already attracted lots of attention. These include universal horizons in static spacetimes [124,[220][221][222][223][224][225][226][227][228][229][230][231][232][233][234][235][236], and the ones with rotation [219,237,238] 25 . In particular, it was showed that universal horizons exist in the 24 To avoid theČerenkov effects, in the khronometric theory, or more general, in the Einstein-aether theory, c φ is required to be no less than the speed of light c φ ≥ c [204]. ...
Ho\v{r}ava's quantum gravity at a Lifshitz point is a theory intended to quantize gravity by using traditional quantum field theories. To avoid Ostrogradsky's ghosts, a problem that has been facing in quantization of general relativity since the middle of 1970's, Ho\v{r}ava chose to break the Lorentz invariance by a Lifshitz-type of anisotropic scaling between space and time at the ultra-high energy, while recovering (approximately) the invariance at low energies. With the stringent observational constraints and self-consistency, it turns out that this is not an easy task, and various modifications have been proposed, since the first incarnation of the theory in 2009. In this review, we shall provide a progress report on the recent development of Ho\v{r}ava gravity. In particular, we first present four so far most-studied versions of Ho\v{r}ava gravity, by focusing first on their self-consistency and then their consistency with experiments, including the solar system tests and cosmological observations. Then, we provide a general review on the recent development of the theory in three different but also related areas: (i) universal horizons, black holes and their thermodynamics; (ii) non-relativistic gauge/gravity duality; and (iii) quantization of the theory. The studies in these areas can be easily generalized to other gravitational theories with broken Lorentz invariance.
