Is the Great Attractor Really a Great Wall?

We discuss some of the cosmological consequences of a late-time ( z 5 lo3) phase transition which produces light domain walls. The observed peculiar velocity field of the Universe and the observed isotropy of the microwave background radiation severely constrain the wall surface density (= a) in such a scenario: Go 5 10-4H~ (Ho is the present value of the Hubble parameter). The most interesting consequence of such a phase transition is the possibility that the local, coherent streaming motion of 600kmsec-' reported by the Seven Samurai could be explained by the repulsive effect of a relic domain wall within our Hubble volume (the Great Wall) provided that Ga/Ho z (BBSA-CB-lEU772) 1s I€€ G E E A ' I A'I'IEACTCB U8917540 ChALLY A GEEdI &ALL ( C a l i f c r n i a CEiv.) e p CSCL 20c Unclas G3/77 0189645 Operrtod by Unlverslties Research Association Inc. under contract with the United States Department of Energy https://ntrs.nasa.gov/search.jsp?R=19890008169 2018-03-26T21:59:44+00:00Z