Communication Through an Extra Dimension

Kälbermann, G.

doi:10.1142/s0217751x00001920

Cited by 25 publications

(39 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This picture leads to a framework in which the on-brane geodesic felt by an active neutrino is longer than the bulk geodesic felt by a sterile neutrino. Such apparent superluminal behavior for gauge-singlet quanta has been noted before, for the graviton [8,9].…”

Section: A Metric For Bulk Shortcutssupporting

confidence: 77%

Sterile-active neutrino oscillations and shortcuts in the extra dimension

2005

View full text Add to dashboard Cite

We discuss a possible new resonance in active-sterile neutrino oscillations arising in theories with large extra dimensions. Fluctuations in the brane effectively increase the path-length of active neutrinos relative to the path-length of sterile neutrinos through the extra-dimensional bulk. Well below the resonance, the standard oscillation formulas apply. Well above the resonance, active-sterile oscillations are suppressed. We show that a resonance energy in the range of 30−400 MeV allows an explanation of all neutrino oscillation data, including LSND data, in a consistent four-neutrino model.A high resonance energy implies an enhanced signal in MiniBooNE. A low resonance energy implies a distorted energy spectrum in LSND, and an enhanced ν µ depletion from a stopped-pion source. The numerical value of the resonance energy may be related back to the geometric aspects of the brane world. Some astrophysical and cosmological consequences of the brane-bulk resonance are briefly sketched.

show abstract

Section: A Metric For Bulk Shortcutssupporting

confidence: 77%

Sterile-active neutrino oscillations and shortcuts in the extra dimension

2005

View full text Add to dashboard Cite

show abstract

“…Rather than adapt inflation in brane cosmology, one may wonder wether it is possible to solve the horizon problem altogether without using inflation. A promising feature of brane cosmology in this respect is the possibility for a signal to propagate more rapidly in the bulk than along the brane, 41) thus modifying ordinary causality. 42) This property can also be found in non cosmological brane models, usually called Lorentz violation.…”

Section: §6 Inflation In the Branementioning

confidence: 99%

Brane Cosmology

Langlois

2002

Prog. Theor. Phys. Suppl.

293

296

View full text Add to dashboard Cite

These notes give an introductory review on brane cosmology. This subject deals with the cosmological behaviour of a brane-universe, i.e. a three-dimensional space, where ordinary matter is confined, embedded in a higher dimensional spacetime. In the tractable case of a five-dimensional bulk spacetime, the brane (modified) Friedmann equation is discussed in detail, and various other aspects are presented, such as cosmological perturbations, bulk scalar fields and systems with several branes. * ) by guest on July 6, 2015 http://ptps.oxfordjournals.org/ Downloaded from §2. Pre-history of brane cosmology Since our purpose is to describe (homogeneous) cosmology within the brane, we will model our four-dimensional universe as an infinitesimally thin wall of constant spatial curvature embedded in a five-dimensional spacetime. This means that we need to consider spacetimes with planar (or spherical/hyperboloidal) symmetry along by guest on July 6, 2015 http://ptps.oxfordjournals.org/ Downloaded fromwhere R AB is the five-dimensional Ricci tensor and R = R A A its trace. Λ stands for a possible bulk cosmological constant, whereas T AB is the total energy momentum tensor. It includes the energy-momentum tensor of the brane, which is distributional by guest on July 6, 2015 http://ptps.oxfordjournals.org/ Downloaded from

show abstract

“…Such a possibility has been alluded to before (see for example Ref. [4] and the footnote in Ref. [5]).…”

Section: Introductionmentioning

confidence: 96%

Can geodesics in extra dimensions solve the cosmological horizon problem?

2000

View full text Add to dashboard Cite

We demonstrate a non-inflationary solution to the cosmological horizon problem in scenarios in which our observable universe is confined to three spatial dimensions (a three-brane) embedded in a higher dimensional space. A signal traveling along an extra-dimensional null geodesic may leave our three-brane, travel into the extra dimensions, and subsequently return to a different place on our three-brane in a shorter time than the time a signal confined to our three-brane would take. Hence, these geodesics may connect distant points which would otherwise be "outside" the four dimensional horizon (points not in causal contact with one another).98.80, 98.80.C

show abstract

Communication Through an Extra Dimension

Cited by 25 publications

References 11 publications

Sterile-active neutrino oscillations and shortcuts in the extra dimension

Sterile-active neutrino oscillations and shortcuts in the extra dimension

Brane Cosmology

Can geodesics in extra dimensions solve the cosmological horizon problem?

Contact Info

Product

Resources

About