Physical Review D, ( ISI ), Volume (100), No (10), Year (2019-11)

Title : ( Minimal independent couplings at order α′2 )

Authors: Mohammad Reza Garousi , hamid razaghian ,

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Abstract

Using field redefinitions and Bianchi identities on the general form of the effective action for metric, ‎$‎B‎$‎-field and dilaton, we have found that the minimum number of independent couplings at order ‎$‎\\\\alpha\\\'^2‎$ is 60‎. We write these couplings in two different schemes in the string frame. In the first scheme, each coupling does not include terms with more than two derivatives and it does not include structures ‎$‎R,\\\\,R_{\\\\mu\\\\nu},\\\\,\\\\nabla_\\\\mu H^{\\\\mu\\\\alpha\\\\beta}‎$, ‎‎$‎ \\\\nabla_\\\\mu\\\\nabla^\\\\mu\\\\Phi‎$‎. In this scheme, 20 couplings which are the minimum number of couplings for metric and ‎$‎B‎$‎-field, include dilaton trivially as the overall factor ‎of $‎e^{-2\\\\Phi}‎$‎, and all other couplings include derivatives of dilaton. ‎ ‎In the second scheme, the dilaton appears in all 60 coupling only as the overall factor of ‎$‎e‎^{-2\\\\Phi}‎$ ‎‎. In this scheme, ‎20 ‎of ‎the ‎couplings ‎are ‎the ‎same ‎as those ‎in ‎the ‎previous ‎scheme.‎‎‎‎‎‎ ‎

Keywords

, Higher, derivative theory
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@article{paperid:1076991,
author = {Garousi, Mohammad Reza and Razaghian, Hamid},
title = {Minimal independent couplings at order α′2},
journal = {Physical Review D},
year = {2019},
volume = {100},
number = {10},
month = {November},
issn = {2470-0010},
keywords = {Higher-derivative theory},
}

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%0 Journal Article
%T Minimal independent couplings at order α′2
%A Garousi, Mohammad Reza
%A Razaghian, Hamid
%J Physical Review D
%@ 2470-0010
%D 2019

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