Testing braneworlds with the binary pulsar
Ruth Durrer, Philippe Kocian
TL;DR
This paper investigates how five-dimensional braneworld models affect gravitational wave emission from binary pulsars, finding significant deviations from general relativity that are inconsistent with current observations.
Contribution
It provides a calculation of gravitational wave emission in braneworld scenarios, highlighting the impact of extra degrees of freedom on observable pulsar data.
Findings
The 'gravi-scalar' modifies Einstein's quadrupole formula.
Predicted deviations are about 20%, exceeding observational limits.
Current data exclude the braneworld effects considered in this model.
Abstract
In this letter we calculate the emission of gravity waves by the binary pulsar in the framework of five dimensional braneworlds. We consider only spacetimes with one compact extra-dimension. We show that the presence of additional degrees of freedom, especially the 'gravi-scalar' leads to a modification of Einstein's quadrupole formula. We compute the induced change for the binary pulsar PSR 1913+16 where it amounts to about 20% which is by far excluded by present experimental data.
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