composite gravity

{{Short description|Class of models of gravitation treating gravitons as composite particles}}

In theoretical physics, composite gravity refers to models that attempted to derive general relativity in a framework where the graviton is constructed as a composite bound state of more elementary particles, usually fermions. A theorem by Steven Weinberg and Edward Witten shows that this is not possible in Lorentz covariant theories: massless particles with spin greater than one are forbidden. The AdS/CFT correspondence may be viewed as a loophole in their argument. However, in this case not only the graviton is emergent; a whole spacetime dimension is emergent, too.

{{cite journal

|url=http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000073000007075012000001&idtype=cvips&gifs=yes

|title=Probing composite gravity in colliders

|journal=Physical Review D

|volume=73

|issue=7

|pages=075012

|publisher=scitation.aip.org

|accessdate=2008-07-08

|bibcode=2006PhRvD..73g5012O

|last1=Okui

|first1=Takemichi

|year=2006

|arxiv=hep-ph/0511082

|doi=10.1103/PhysRevD.73.075012

|s2cid=34102365

}}