Teleparallel loop quantum cosmology in a system of intersecting branes
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Recently, some authors have removed the big bang singularity in teleparallel Loop Quantum Cosmology (LQC) and have shown that the universe may undergo a number of oscillations. We investigate the origin of this type of teleparallel theory in a system of intersecting branes in M-theory in which the angle between them changes with time. This system is constructed by two intersecting anti-D8-branes, one compacted D4-brane and a D3-brane. These branes are built by joining M0-branes which develop in decaying fundamental strings. The compacted D4-brane is located between two intersecting anti-D8branes and glues to one of them. Our universe is located on the D3brane which wraps around the D4brane from one end and sticks to one of the anti-D8branes from the other one. In this system, there are three types of fields, corresponding to compacted D4branes, intersecting branes and D3-branes. These fields interact with each other and make the angle between branes oscillate. By decreasing this angle, the intersecting anti-D8branes approach each other, the D4brane rolls, the D3brane wraps around the D4brane, and the universe contracts. By separating the intersecting branes and increasing the angle, the D4brane rolls in the opposite direction, the D3brane separates from it and the expansion branch begins. Also, the interaction between branes in this system gives us the exact form of the relevant Lagrangian for teleparallel LQC.
CitationHaro, J. Teleparallel loop quantum cosmology in a system of intersecting branes. "Physics letters B", 10 Setembre 2016, vol. 760, p. 94-100.