TY - JOUR
T1 - On gravitational repulsion
AU - Piran, Tsvi
PY - 1997
Y1 - 1997
N2 - The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations - small dimples in the primordial density field - that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and grow to become voids in the galaxy distribution. These voids - regions with a diameter of 40h-1 Mpc which are almost devoid of galaxies - are the largest objects in the Universe.
AB - The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations - small dimples in the primordial density field - that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and grow to become voids in the galaxy distribution. These voids - regions with a diameter of 40h-1 Mpc which are almost devoid of galaxies - are the largest objects in the Universe.
KW - Primordial density fluctuations
UR - http://www.scopus.com/inward/record.url?scp=0031500402&partnerID=8YFLogxK
U2 - 10.1023/A:1018877928270
DO - 10.1023/A:1018877928270
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AN - SCOPUS:0031500402
SN - 0001-7701
VL - 29
SP - 1363
EP - 1370
JO - General Relativity and Gravitation
JF - General Relativity and Gravitation
IS - 11
ER -