A symmetric triple product $p$-adic $L$-function

In 2014, Darmon and Rotger defined the Garrett-Rankin triple product $p$-adic $L$-function and related it to the image of certain diagonal cycles under the $p$-adic Abel-Jacobi map. We introduce a new variant of this $p$-adic $L$-function and show that it satisfies symmetry relations, when permuting the three families of modular forms. We also provide computational evidence confirming that it is indeed cyclic when the families of modular forms are evaluated at even weights, and provide counter-examples in the case of odd weights. To do so, we extend the algorithm provided in arXiv:1310.4421 to allow for ordinary projections of nearly overconvergent modular forms -- not just overconvergent modular forms -- as well as certain projections over spaces of non-zero slope.Comment: 26 page