# A fine tuning free resolution of the cosmological constant problem

@inproceedings{Alexander2007AFT,
title={A fine tuning free resolution of the cosmological constant problem},
author={Stephon H. S. Alexander and Deepak Vaid},
year={2007}
}
• Published 8 February 2007
• Physics
In a recent paper we discovered that a fermionic condensate is formed from gravitational interactions due to the covariant coupling of fermions in the presence of a torsion‐fermion contact interaction.The condensate gap gives a negative contribution to the bare cosmological constant. In this letter, we show that the cosmological constant problem can be solved without fine tuning of the bare cosmological constant. We demonstrate how a universe with a large initial cosmological constant undergoes…
11 Citations

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## References

SHOWING 1-5 OF 5 REFERENCES

We argue that, when coupled to Einstein's theory of gravity, the Yukawa theory may solve the cosmological constant problem in the following sense: The radiative corrections of fermions generate an

### Fortsch

• Phys. 47, 389
• 1999

• Rel. 4, 1
• 2001

### Quantum theory of manyparticle systems (Dover

• Mineola, N.Y.,
• 2003