TY - JOUR
T1 - The most general second-order field equations of bi-scalar-tensor theory in four dimensions
AU - Ohashi, Seiju
AU - Tanahashi, Norihiro
AU - Kobayashi, Tsutomu
AU - Yamaguchi, Masahide
N1 - Publisher Copyright:
© 2015, The Author(s).
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Abstract: The Horndeski theory is known as the most general scalar-tensor theory with second-order field equations. In this paper, we explore the bi-scalar extension of the Horndeski theory. Following Horndeski’s approach, we determine all the possible terms appearing in the second-order field equations of the bi-scalar-tensor theory. We compare the field equations with those of the generalized multi-Galileons, and confirm that our theory contains new terms that are not included in the latter theory. We also discuss the construction of the Lagrangian leading to our most general field equations.
AB - Abstract: The Horndeski theory is known as the most general scalar-tensor theory with second-order field equations. In this paper, we explore the bi-scalar extension of the Horndeski theory. Following Horndeski’s approach, we determine all the possible terms appearing in the second-order field equations of the bi-scalar-tensor theory. We compare the field equations with those of the generalized multi-Galileons, and confirm that our theory contains new terms that are not included in the latter theory. We also discuss the construction of the Lagrangian leading to our most general field equations.
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U2 - 10.1007/JHEP07(2015)008
DO - 10.1007/JHEP07(2015)008
M3 - Article
AN - SCOPUS:84957885482
SN - 1126-6708
VL - 2015
SP - 1
EP - 22
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 7
M1 - 8
ER -