2,284 research outputs found
Closed string Ramond-Ramond proposed higher derivative interactions on fermionic amplitudes in IIB
The complete form of the amplitude of one closed string Ramond-Ramond (RR),
two fermionic strings and one scalar field in IIB superstring theory has been
computed in detail. Deriving by using
suitable gauge fixing, we discover some new vertices and their higher
derivative corrections. We investigate both infinite gauge and scalar
channel poles of this amplitude. In particular, by using the fact that the
kinetic term of fermion fields has no correction, employing Born-Infeld action,
the Wess-Zumino terms and their higher derivative corrections, we discover all
infinite channel fermion poles. The couplings between one RR and two
fermions and all their infinite higher derivative corrections have been
explored. In order to look for all infinite channel scalar/gauge
poles for cases, we obtain the couplings between two fermions-two
scalars and two fermions, one scalar and one gauge field as well as all their
infinite higher derivative corrections in type IIB. Specifically we make
various comments based on arXiv:1205.5079 in favor of universality conjecture
for all order higher derivative corrections (with or without low energy
expansion) and the relation of open/closed string that is responsible for all
superstring scattering amplitudes in IIA,IIB.Comment: 29 pages, figures are removed. Sections 3,4, and 5 are shortened. To
appear in NP
Shedding light on new Wess-Zumino couplings with their corrections to all orders in alpha-prime
Motivated by arXiv:1203.5553, we continue to match super string amplitudes
with their own effective field theory. We carry out within full details the
computations of the complete form of the amplitude of one closed string
Ramond-Ramond field and three SYM vertex operators, namely one gauge field and
two scalar fields in type IIB(A) super string theories. Making use of the
recent two gauge and two scalar couplings to all orders of , we
produce all the infinite gauge poles for case (with as RR field
strength's rank and as the dimension of a D-brane). Proceeding with
direct and full S-Matrix calculations, we are able to produce even all the
infinite gauge poles in u-channel for case in field theory as well. New
couplings for case with their all order corrections are
discovered. In addition, we explain how to find out all the infinite scalar
poles of this amplitude in -channels and produce them for case. By
comparing all of the contact terms of this amplitude, we obtain several new
couplings with their higher derivative corrections for cases. These
new couplings are neither inside Myers'terms nor within pull-back/Taylor
expansions. Finally we comment on some related issues.Comment: 38 pages, No figure, the version that appears in JHEP and a minor
correction, CERN-PH-TH/2012-34
On D-brane anti D-brane effective actions and their corrections to all orders in alpha-prime
Based on a four point function, the S-matrix elements at disk level of the
scattering amplitude of one closed string Ramond-Ramond field (), two
tachyons and one scalar field, we find out new couplings in brane anti brane
effective actions for cases. Using the infinite corrections of the
vertex of one RR, one gauge and one scalar field and applying the correct
expansion, it is investigated in detail how we produce the infinite gauge poles
of the amplitude for case. By discovering new higher derivative
corrections of two tachyon-two scalar couplings in brane anti brane systems to
all orders in , we also obtain the infinite scalar poles in
-channel in field theory. Working with the complete form of the
amplitude with the closed form of the expansion and comparing all the infinite
contact terms of this amplitude, we derive several new Wess-Zumino couplings
with all their infinite higher derivative corrections in the world volume of
brane anti brane systems. In particular, in producing all the infinite scalar
poles of , one has to consider the fact that scalar 's
vertex operator in -picture must carry the internal Chan-Paton
matrix. The symmetric trace effective action has a non-zero coupling between
and while this coupling does not exist in
ordinary trace effective action.Comment: 32 pages, no figure, CERN-PH-TH/2012-341,V3. Acknowledgments, refs
and some comments in the conclusion section are added. The version that has
been accepted in JCA
On RR Couplings and Bulk Singularity Structures of Non-BPS Branes
We compute the five point world sheet scattering amplitude of a symmetric
closed string Ramond-Ramond , a transverse scalar field, a world volume gauge
field and a real tachyon in both world volume and transverse directions of
brane in type IIA and IIB superstring theory. We provide the complete analysis
of S-matrix and show that both
and channel bulk singularity structures can also be examined by this
S-matrix. Various remarks about new restricted Bianchi identities on world
volume for the other pictures have also been made.Comment: 21 pages, no figure, Latex file, v3: clarifications added. Published
version in PL
On Bulk Singularity Structures and all order Contact Terms of BPS String Amplitudes
The entire form of the amplitude of three SYM ( involving two transverse
scalar fields, a gauge field) and a potential Ramond-Ramond (RR) form
field is found out. We first derive and then start constructing an infinite number of channel
bulk singularity structures by means of all order corrections to
pull-back of brane in an Effective Field Theory (EFT). Due to presence of the
complete form of S-matrix, several new contact interactions as well as new
couplings are explored. It is also shown that these couplings can be verified
at the level of EFT by either the combinations of Myers terms, pull-back,
Taylor expanded of scalar fields or the mixed combination of the couplings of
this paper as well as employed Bianchi identities. For the first time, we also
derive the algebraic and the complete form of the integrations for some
arbitrary combinations of Mandelstam variables and for the most general case
on upper half
plane as well.Comment: 21 pages, Latex file, no figure, Published version in PL
On RR Couplings, Singularity Structures and all order contact interactions to BPS String Amplitudes
We evaluate five point world-sheet string theory amplitudes of one transverse
scalar field, two world volume gauge fields ( and two transverse scalars, a
gauge field) in the presence of a closed string Ramond-Ramond vertex operator
in its symmetric picture. We carry out all the entire S-matrix elements of five
point mixed RR-scalars/gauge fields , in detail and start comparing all order
contact interactions and singularities in both transverse and world
volume directions. We explore the presence of various new couplings in string
theory effective actions and find out their all order higher
derivative corrections in both type IIA and IIB. Ultimately we make various
remarks for the singularities and contact terms whose RR momenta are embedded
in transverse directions. corrections to some of Myers terms are also
addressed.Comment: V2:39 pages,no figure, Latex file. The style has been improved,
explanations and clarifications are given. The accepted version in JHE
Remarks on Non-BPS String Amplitudes and Their All Order Contact Interactions in IIB, IIA
We explore the entire form of S-Matrix elements of a potential
Ramond-Ramond (RR) form field, a tachyon and two transverse scalar fields on
both world volume and transverse directions of type IIB and IIA superstring
theories. Apart from the
other scattering amplitude, namely is also revealed. We then start to compare all singularity structures
of symmetric and asymmetric analysis, generating all infinite singularity
structures as well as all order contact interactions on the whole
directions. This leads to deriving various new contact terms and several new
restricted Bianchi identities in both type IIB and IIA. It is also shown that
just some of the new couplings of type IIB (IIA) string theory can be
re-verified in an Effective Field Theory (EFT) by pull-back of branes. To
construct the rest of S-matrix elements one needs to first derive restricted
world volume (or bulk) Bianchi identities and then discover new EFT couplings
in both type IIB and IIA. Finally the presence of commutator of scalar fields
inside the exponential of Wess-Zumino action for non-BPS branes has been
confirmed as well.Comment: 17 pages, no figure, Latex files. v2 : CP factors are explained ,
clarifications added and typos are removed. To appear in JHE
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