# Why things fall

@article{Dreyer2007WhyTF, title={Why things fall}, author={Olaf Dreyer}, journal={arXiv: General Relativity and Quantum Cosmology}, year={2007} }

In this paper we discuss Internal Relativity, a recent program to address the problem of quantum gravity. In our approach we change the relationship between spacetime and matter. Currently we view matter as propagating on spacetime. Einstein's equations encode how spacetime curves due to the presence of matter and how spacetime, in turn, tells matter how to propagate. In internal realtivity matter and spacetime cease to exist as distinct entities, rather, they arise simultaneously from an…

## 17 Citations

Analogue Models for Emergent Gravity

- Physics
- 2009

Gravity stands out among the fundamental interactions because of its apparent incompatibility with having a quantum description. Moreover, thermodynamic aspects of gravitation theory appears as…

Exploring Spacetime Phenomenology: From Lorentz Violations to Experimental Tests of Non-locality

- Physics
- 2016

Doctor of Philosophy Exploring Spacetime Phenomenology: From Lorentz Violations to Experimental Tests of Non-locality by Alessio BELENCHIA This thesis deals primarily with the phenomenology…

Analogue gravitational phenomena in Bose-Einstein condensates

- Physics
- 2012

Analogue gravity is based on the simple observation that perturbations propagating in several physical systems can be described by a quantum field theory in a curved spacetime. While phenomena like…

Emergence of Lorentzian signature and scalar gravity

- Physics
- 2009

In recent years, a growing momentum has been gained by the emergent gravity framework. Within the latter, the very concepts of geometry and gravitational interaction are not seen as elementary…

Emergent Gravity : the Analogue Models Perspective

- Sociology
- 2009

This thesis is devoted to the study of some aspects of emergent gravity scenarios, i.e. of non-gravitational systems which exhibit, under suitable conditions, the emergence of effective spacetime…

Time is not the problem

- Physics
- 2009

Attempts to quantize general relativity encounter an odd problem. The Hamiltonian that normally generates time evolution vanishes in the case of general relativity as a result of diffeomorphism…

Relativistic Bose?Einstein condensates: a new system for analogue models of gravity

- Physics
- 2010

In this paper we propose to apply the analogy between gravity and condensed matter physics to relativistic Bose?Einstein condensates (RBECs), i.e. condensates composed by relativistic constituents.…

Early Universe Cosmology in Internal Relativity

- Physics
- 2008

We present a new approach to early universe cosmology. Inflation is replaced by a phase transition in which both matter and geometry are created simultaneously. We calculate the spectrum of metric…

The quantum geometric limit

- Physics
- 2012

In Einstein's gedankenexperiment for measuring space and time, an ensemble of clocks moving through curved spacetime measures geometry by sending signals back and forth, as in the global positioning…

Quantum histories and quantum gravity

- Physics
- 2009

This paper reviews the histories approach to quantum mechanics. This discussion is then applied to theories of quantum gravity. It is argued that the results of all measurements in suitably defined…

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