Chapter

Dealing with Naturalness

Gian Francesco Giudice

in A Zeptospace Odyssey: A Journey into the Physics of the LHC

Published in print December 2009 | ISBN: 9780199581917
Published online February 2010 | e-ISBN: 9780191723001 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199581917.003.0009
Dealing with Naturalness

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The naturalness problem is regarded by most physicists as one of the primary motivations for expecting new particles or new phenomena in zeptospace. This conceptual problem arises from the existence of a large ratio between the weak and the Planck lengths, in spite of the natural tendency of virtual particles to erase any difference between the two lengths. This chapter explains the problem, starting from a discussion of the hierarchy between weak and gravitational forces and then elucidating the meaning of virtual particles. Finally, the role of symmetries in the naturalness problem is introduced.

Keywords: naturalness problem; gravitational forces; virtual particles; fine tuning

Chapter.  3711 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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