@article{7389,
  abstract     = {Recently Kloeckner described the structure of the isometry group of the quadratic Wasserstein space W_2(R^n). It turned out that the case of the real line is exceptional in the sense that there exists an exotic isometry flow. Following this line of investigation, we compute Isom(W_p(R)), the isometry group of the Wasserstein space
W_p(R) for all p \in [1,\infty) \setminus {2}. We show that W_2(R) is also exceptional regarding the
parameter p: W_p(R) is isometrically rigid if and only if p is not equal to 2. Regarding the underlying
space, we prove that the exceptionality of p = 2 disappears if we replace R by the compact
interval [0,1]. Surprisingly, in that case, W_p([0,1]) is isometrically rigid if and only if
p is not equal to 1. Moreover, W_1([0,1]) admits isometries that split mass, and Isom(W_1([0,1]))
cannot be embedded into Isom(W_1(R)).},
  author       = {Geher, Gyorgy Pal and Titkos, Tamas and Virosztek, Daniel},
  issn         = {10886850},
  journal      = {Transactions of the American Mathematical Society},
  keywords     = {Wasserstein space, isometric embeddings, isometric rigidity, exotic isometry flow},
  number       = {8},
  pages        = {5855--5883},
  publisher    = {American Mathematical Society},
  title        = {{Isometric study of Wasserstein spaces - the real line}},
  doi          = {10.1090/tran/8113},
  volume       = {373},
  year         = {2020},
}