Extra dimensions present a new flatness problem

Daniel J. H. Chung, Edward W. Kolb, and Antonio Riotto
Phys. Rev. D 65, 083516 – Published 8 April 2002
PDFExport Citation

Abstract

There is no known fundamental reason to demand as a cosmological initial condition that the bulk possess an SO(3,1) isometry. On the contrary, one expects bulk curvature terms that violate the SO(3,1) isometry at early epochs, leading to a violation of Lorentz invariance on our brane. Demanding that the Lorentz noninvariant terms are small leads to a new “flatness” problem, not solved by the usual formulation of inflation for a class of braneworld solutions. Furthermore, unlike in four dimensions, the Lorentz violations induced from the bulk curvature cannot always be removed as the infrared cutoff is taken arbitrarily large. This means that the equivalence principle in higher dimensions does not guarantee the equivalence principle in dimensionally reduced theories. Near-future experiments are expected to severely constrain these Lorentz-violating “signatures” of extra dimensions.

  • Received 15 August 2000

DOI:https://doi.org/10.1103/PhysRevD.65.083516

©2002 American Physical Society

Authors & Affiliations

Daniel J. H. Chung*

  • Randall Physics Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120

Edward W. Kolb

  • NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500
  • Department of Astronomy and Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433

Antonio Riotto

  • Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
  • INFN, Sezione di Pisa, I-56127 Pisa, Italy

  • *Electronic mail: djchung@umich.edu
  • Electronic mail: rocky@rigoletto.fnal.gov
  • Electronic mail: riotto@cibs.sns.it

References (Subscription Required)

Click to Expand
Issue

Vol. 65, Iss. 8 — 15 April 2002

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×