Even a tiny positive cosmological constant casts a long shadow

          @misc{ scivideos_PIRSA:15050135,
            doi = {10.48660/15050135},
            url = {https://pirsa.org/15050135},
            author = {Ashtekar, Abhay},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Even a tiny positive cosmological constant casts a long shadow},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2015},
            month = {may},
            note = {PIRSA:15050135 see, \url{https://scivideos.org/index.php/pirsa/15050135}}
          }