# A Scale at 10 MeV, Gravitational Topological Vacuum, and Large Extra Dimensions

@article{Aydemir2017ASA, title={A Scale at 10 MeV, Gravitational Topological Vacuum, and Large Extra Dimensions}, author={Ufuk Aydemir}, journal={Universe}, year={2017} }

We discuss a possible scale of gravitational origin at around 10 MeV, or 10−12 cm, which arises in the MacDowell-Mansouri formalism of gravity due to the topological Gauss-Bonnet term in the action, as pointed out by Bjorken several years ago.~A length scale of the same size emerges also in the Kodama solution in gravity, which is known to be closely related to the MacDowell-Mansouri formulation. We particularly draw attention to the intriguing incident that existence of six compact extra…

## One Citation

### Gravity and unification: a review

- PhysicsClassical and Quantum Gravity
- 2018

We review various classical unified theories of gravity and other interactions that have appeared in the literature, paying special attention to scenarios in which spacetime remains four-dimensional,…

## References

SHOWING 1-10 OF 126 REFERENCES

### Phenomenology, astrophysics and cosmology of theories with submillimeter dimensions and TeV scale quantum gravity

- Physics
- 1999

We recently proposed a solution to the hierarchy problem not relying on low-energy supersymmetry or technicolor. Instead, the problem is nullified by bringing quantum gravity down to the TeV scale.…

### Cosmological constant from the ghost: A toy model

- Physics
- 2009

We suggest that the solution to the cosmological vacuum energy puzzle is linked to the infrared sector of the effective theory of gravity interacting with standard model fields. We propose a specific…

### Quantum gravity with a positive cosmological constant

- Physics
- 2002

A quantum theory of gravity is described in the case of a positive cosmological constant in 3 + 1 dimensions. Both old and new results are described, which support the case that loop quantum gravity…

### Higgs mass, superconnections, and the TeV-scale left-right symmetric model

- Physics
- 2015

We discuss the physical implications of formulating the Standard Model (SM) in terms of the superconnection formalism involving the superalgebra s u ( 2 / 1 ) . In particular, we discuss the…

### Lectures on the Cosmological Constant Problem

- Physics
- 2015

These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, emphasising the…