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We consider braneworld scenarios embedded into string theory. We find that the Dbrane backreaction induces a large increase in the open string?s proper length. Consequently the stringy nature of elementary particles can be detected at distances much larger than the fundamental string scale. As an example, we compute the gravitational potential between two open strings ending on backreacting D3branes in fourdimensional compactifications of type II string theory. We find that the Newtonian potential receives a correction that goes like 1/r but that is not proportional to the inertial masses of the open strings, implying a violation of the equivalence principle in the effective gravitational theory. This stringy correction is screened by thermal effects when the distance between the strings is greater than the inverse temperature. This suggests new experimental tests for many phenomenological models in type II string theory.
Dbranes are nonperturbative extended objects which play a key role in many recent developments of string theory. The elementary degrees of freedom of Dbranes are open strings with endpoints attached to the Dbranes. String theory has been extensively studied in the probebrane approximation, while much less is understood when the backreaction of the Dbranes is taken into account. In this Letter we compute the gravitational potential energy between open strings ending on backreacting D3branes. We find that the Dbrane backreaction yields a large correction to the gravitational potential. This happens because the gravitons exchanged between the open strings are sensitive to the geometry in the neighborhood of the Dbranes, which is strongly deformed by the Dbrane backreaction.
Our results are relevant for a large family of phenomenological models, which are promising candidates to embed our universe into string theory. In these scenarios, the standard model is localized on Dbranes arranged in a fourdimensional compactification of superstring theory. Our computations show that an observer living on such a braneworld could detect a macroscopic violation of the equivalence principle at very low temperatures.
Dbranes are nonperturbative extended objects which play a key role in many recent developments of string theory. The elementary degrees of freedom of Dbranes are open strings with endpoints attached to the Dbranes. String theory has been extensively studied in the probebrane approximation, while much less is understood when the backreaction of the Dbranes is taken into account. In this Letter we compute the gravitational potential energy between open strings ending on backreacting D3branes. We find that the Dbrane backreaction yields a large correction to the gravitational potential. This happens because the gravitons exchanged between the open strings are sensitive to the geometry in the neighborhood of the Dbranes, which is strongly deformed by the Dbrane backreaction.
Our results are relevant for a large family of phenomenological models, which are promising candidates to embed our universe into string theory. In these scenarios, the standard model is localized on Dbranes arranged in a fourdimensional compactification of superstring theory. Our computations show that an observer living on such a braneworld could detect a macroscopic violation of the equivalence principle at very low temperatures.
Originele taal2  English 

Pagina's (vantot)  456459 
Aantal pagina's  4 
Tijdschrift  Physics Letters B 
Volume  712 
Nummer van het tijdschrift  45 
Status  Published  12 jun 2012 
Vingerafdruk
Duik in de onderzoeksthema's van 'The fate of Newtonʼs law in braneworld scenarios'. Samen vormen ze een unieke vingerafdruk.
SRP8: SRP (Zwaartepunt): HogeEnergiefysica
D'Hondt, J., Van Eijndhoven, N., Craps, B. & Buitink, S.
1/11/12 → 31/10/24
Project: Fundamenteel

FWOTM563: String theorie in ruimtetijden met RamondRamond fluxen en in nietcompacte gekromde ruimtetijden.
Benichou, R. & Sevrin, A.
1/10/10 → 30/09/13
Project: Fundamenteel