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Journal articles on the topic 'Supergravity; Low energy; String theory'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

SENGUPTA, SOUMITRA, and PARTHASARATHI MAJUMDAR. "STRINGY EFFECTS ON SUPERSYMMETRY BREAKING IN LOW ENERGY SUPERGRAVITY THEORIES." International Journal of Modern Physics A 06, no. 01 (January 10, 1991): 41–58. http://dx.doi.org/10.1142/s0217751x91000046.

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The possibility of soft supersymmetry breaking at the tree level of string-inspired low energy supergravity theory is investigated. It is shown that the stringy quantum effects like the world sheet instanton and string loop effects can induce soft supersymmetry breakings at the tree level of the observable sector. Generic mass terms and trilinear soft breaking terms that arise are calculated.

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2

DUFF, M. J. "M THEORY (THE THEORY FORMERLY KNOWN AS STRINGS)." International Journal of Modern Physics A 11, no. 32 (December 30, 1996): 5623–41. http://dx.doi.org/10.1142/s0217751x96002583.

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Superunification underwent a major paradigm shift in 1984 when eleven-dimensional supergravity was knocked off its pedestal by ten-dimensional superstrings. This last year has witnessed a new shift of equal proportions: perturbative ten-dimensional superstrings have in their turn been superseded by a new nonperturbative theory called M theory, which describes supermembranes and superfivebranes, which subsumes all five consistent string theories and whose low energy limit is, ironically, eleven-dimensional supergravity. In particular, six-dimensional string/string duality follows from membrane/fivebrane duality by compactifying M theory on S1/Z2×K3 (heterotic/heterotic duality) or S1×K3 (Type IIA/heterotic duality) or S1/Z2×T4 (heterotic/Type IIA duality) or S1×T4 (Type IIA/Type IIA duality).

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3

Burinskii, A. Ya. "Structure of spinning particle suggested by gravity, supergravity and low-energy string theory." Czechoslovak Journal of Physics 50, S1 (January 2000): 201–6. http://dx.doi.org/10.1007/s10582-000-0026-9.

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4

BELLUCCI, S., and D. O'REILLY. "STRING CORRECTIONS TO THE RIEMANN CURVATURE TENSOR AND THE THIRD-ORDER SOLUTION." Modern Physics Letters A 27, no. 22 (July 18, 2012): 1250122. http://dx.doi.org/10.1142/s0217732312501222.

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The string corrections to the Riemann curvature tensor are found to first-order in the string slope parameter. This is done for D = 10, N = 1 supergravity, the presumed low energy limit of string theory. We then use a related constraint and proceed to find a third-order solution.

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5

HERRERA-AGUILAR, ALFREDO, and OLEG KECHKIN. "ISRAEL–WILSON–PERJÉS SOLUTIONS IN HETEROTIC STRING THEORY." International Journal of Modern Physics A 14, no. 09 (April 10, 1999): 1345–56. http://dx.doi.org/10.1142/s0217751x99000701.

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We present a simple algorithm to obtain solutions that generalize the Israel–Wilson–Perjés class for the low energy limit of heterotic string theory toroidally compactified from D=d+3 to three dimensions. A remarkable map existing between the Einstein–Maxwell (EM) theory and the theory under consideration allows us to solve directly the equations of motion making use of the matrix Ernst potentials connected with the coset matrix of heterotic string theory.1 For the particular case d=1 (if we put n=6, the resulting theory can be considered as the bosonic part of the action of D=4, N=4 supergravity) we obtain explicitly a dyonic solution in terms of one real 2×2-matrix harmonic function and 2n real constants (n being the number of Abelian vector fields). By studying the asymptotic behavior of the field configurations we define the charges of the system. They satisfy the Bogomol'nyi–Prasad–Sommerfield (BPS) bound.

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6

KITAZAWA, NORIAKI. "GAUGINO CONDENSATION IN HETEROTIC FIVE-BRANE BACKGROUND." Modern Physics Letters A 19, no. 09 (March 21, 2004): 681–92. http://dx.doi.org/10.1142/s0217732304013325.

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The gaugino propagator is calculated by explicitly considering the propagation of a heterotic string between two different points in spacetime using the nontrivial worldsheet conformal field theory for the five-brane background. We find that there are no propagations of gaugino which is in the spinor representation of the nontrivial four-dimensional space of the five-brane background. This result is consistent with the arguments on the fermion zero-modes of the five-brane background in the low-energy heterotic supergravity theory. Furthermore, assuming the continuous limit to the flat spacetime background at the place far away from the five-brane, we suggest an effective propagator which is effective only at the place far away from the five-brane in the flat spacetime limit. From the effective propagator we evaluate a possible gaugino pair condensation. The result is consistent with the suggested scenario of the gaugino condensation in the five-brane background in the low-energy heterotic supergravity theory.

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7

KECHKIN, OLEG V. "NEW PROGRESS IN STATIONARY D=N=4 SUPERGRAVITY." Modern Physics Letters A 16, no. 34 (November 10, 2001): 2221–30. http://dx.doi.org/10.1142/s0217732301005667.

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A bosonic sector of the four-dimensional low-energy heterotic string theory with two Abelian gauge fields is considered in the stationary case. A new 4× 4 unitary null-curvature matrix representation of the theory is derived and the corresponding formulation based on the use of a new 2 × 2 Ernst type matrix complex potential is developed. The group of hidden symmetries is described and classified in the matrix-valued quasi general relativity form. A subgroup of charge symmetries is constructed and representation which transforms linearly under the action of this symmetry subgroup is established. Also the solution generation procedure based on the application of the total charge symmetry subgroup to the stationary Einstein–Maxwell theory is analyzed.

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8

OHTA, NOBUYOSHI. "ACCELERATING COSMOLOGIES AND INFLATION FROM M/SUPERSTRING THEORIES." International Journal of Modern Physics A 20, no. 01 (January 10, 2005): 1–40. http://dx.doi.org/10.1142/s0217751x05021257.

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We review the recent developments in obtaining accelerating cosmologies and/or inflation from higher-dimensional gravitational theories, in particular superstring theories in ten dimensions and M-theory in 11 dimensions. We first discuss why it is difficult to obtain inflationary behavior in the effective low-energy theories of superstring/M-theory, i.e. supergravity theories. We then summarize interesting solutions including S-branes that give rise to accelerating cosmologies and inflationary solutions in M-theory with higher order corrections. Other approaches to inflation in the string context are also briefly discussed.

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9

DANIELSSON, ULF H., GABRIELE FERRETTI, and BO SUNDBORG. "D-PARTICLE DYNAMICS AND BOUND STATES." International Journal of Modern Physics A 11, no. 31 (December 20, 1996): 5463–77. http://dx.doi.org/10.1142/s0217751x96002492.

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We study the low energy effective theory describing the dynamics of D-particles. This corresponds to the quantum-mechanical system obtained by dimensional reduction of (9+1)-dimensional supersymmetric Yang-Mills theory to 0+1 dimensions and can be interpreted as the nonrelativistic limit of the Born-Infeld action. We study the system of two like-charged D-particles and find evidence for the existence of non-BPS states whose mass grows like λ1/3 over the BPS mass. We give a string interpretation of this phenomenon in terms of a linear potential generated by strings stretching from the two D-particles. Some comments on the possible relations to black hole entropy and elevendimensional supergravity are also given.

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10

West, Peter. "A brief review of E theory." International Journal of Modern Physics A 31, no. 26 (September 20, 2016): 1630043. http://dx.doi.org/10.1142/s0217751x1630043x.

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I begin with some memories of Abdus Salam who was my PhD supervisor. After reviewing the theory of nonlinear realisations and Kac–Moody algebras, I explain how to construct the nonlinear realisation based on the Kac–Moody algebra [Formula: see text] and its vector representation. I explain how this field theory leads to dynamical equations which contain an infinite number of fields defined on a space–time with an infinite number of coordinates. I then show that these unique dynamical equations, when truncated to low level fields and the usual coordinates of space–time, lead to precisely the equations of motion of 11-dimensional supergravity theory. By taking different group decompositions of [Formula: see text] we find all the maximal supergravity theories, including the gauged maximal supergravities, and as a result the nonlinear realisation should be thought of as a unified theory that is the low energy effective action for type II strings and branes. These results essentially confirm the [Formula: see text] conjecture given many years ago.

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11

Antoniadis, Ignatios, Yifan Chen, and George K. Leontaris. "Inflation from the internal volume in type IIB/F-theory compactification." International Journal of Modern Physics A 34, no. 08 (March 20, 2019): 1950042. http://dx.doi.org/10.1142/s0217751x19500428.

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We study the cosmological inflation within a recently proposed framework of perturbative moduli stabilization in type IIB/F-theory compactifications on Calabi–Yau threefolds. The stabilization mechanism utilizes three stacks of magnetized 7-branes and relies on perturbative corrections to the Kähler potential that grow logarithmically in the transverse sizes of co-dimension two due to local tadpoles of closed string states in the bulk. The inflaton is the Kähler modulus associated with the internal compactification volume that starts rolling down the scalar potential from an initial condition around its maximum. Although the parameter space allows moduli stabilization in de Sitter space, the resulting number of e-foldings is too low. An extra uplifting source of the vacuum energy is then required to achieve phenomenologically viable inflation and a positive (although tiny) vacuum energy at the minimum. We discuss a class of uplifting potentials arising from strongly coupled matter fields. In a particular case, they reproduce the effect of the new Fayet–Iliopoulos term recently discussed in a supergravity context, that can be written for a non-R-symmetry U(1) and is gauge invariant at the Lagrangian level.

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12

Castellani, Leonardo. "A GEOMETRIC FIELD THEORY OF CLOSED STRINGS: D=4, N=1 LOOP SUPERGRAVITY." International Journal of Modern Physics A 05, no. 09 (May 10, 1990): 1819–32. http://dx.doi.org/10.1142/s0217751x90000854.

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We present a classical field theory of interacting loops, whose low energy limit is D=4, N=1 supergravity. In Fourier modes, the theory is obtained by gauging the infinite dimensional algebra KM (SuperPoincaré) ⊕ Virasoro, where KM indicates the Kac-Moody extension. Taylor expanding the superloop vielbein in the “internal” coordinates yields towers of D=4 fields with arbitrarily high spins. The superloop diffeomorphisms relate all the higher spin fields. The field equations are obtained by requiring the closure of the generalized supersymmetries. Two different mechanisms give rise to masses for the higher modes: (i) a Kaluza-Klein type mass generation from “internal” loop coordinates, (ii) a non-vanishing background value for the zero mode of the Virasoro gauge field.

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13

DEO, B. B. "FOUR-DIMENSIONAL SUPERGRAVITY FROM STRING THEORY." International Journal of Modern Physics A 21, no. 02 (January 20, 2006): 237–49. http://dx.doi.org/10.1142/s0217751x06025365.

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A derivation of N = 1 supergravity action from string theory is presented. Starting from a Nambu–Goto bosonic string, matter field is introduced to obtain a superstring in four dimensions. The excitation quanta of this string contain graviton and the gravitino. Using the principle of equivalence, the action in curved space–time are found and the sum of them is the Deser–Zumino N = 1 supergravity action. The energy tensor is Lorentz invariant due to supersymmetry.

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14

Bailin, David, and Alex Love. "Low energy supergravity of (2, 2) heterotic string theories." Physics Letters B 267, no. 1 (September 1991): 46–50. http://dx.doi.org/10.1016/0370-2693(91)90522-r.

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15

LOPEZ, JORGE L., and D. V. NANOPOULOS. "STRING NO-SCALE SUPERGRAVITY." International Journal of Modern Physics A 11, no. 19 (July 30, 1996): 3439–77. http://dx.doi.org/10.1142/s0217751x96001644.

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We explore the postulates of string no-scale supergravity in the context of free-fermionic string models. The requirements of vanishing vacuum energy, flat directions of the scalar potential, and stable no-scale mechanism impose strong restrictions on possible string no-scale models, which must possess only two or three moduli, and a constrained massless spectrum. The soft-supersymmetry-breaking parameters involving all twisted and untwisted fields are given explicitly. Our calculations take into account the possible existence of an anomalous U A(1) factor in the gauge group, and reveal some novel effects concerning the stability of the no-scale mechanism in the presence of U A(1). This class of models contains no free parameters, i.e. in principle all supersymmetric particle masses and interactions are completely determined. A computerized search for free-fermionic models with the desired properties yields a candidate SU (5)×U(1) model containing extra [Formula: see text] matter representations that allow gauge coupling unification at the string scale. Our candidate model possesses a benign nonuniversal assignment of supersymmetry-breaking scalar masses, which may have interesting low-energy experimental consequences.

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16

Li, Tianjun, D. V. Nanopoulos, and Jorge L. Lopez. "M-Theory Inspired No-Scale Supergravity." Modern Physics Letters A 12, no. 35 (November 20, 1997): 2647–53. http://dx.doi.org/10.1142/s0217732397002788.

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We propose a supergravity model that contains elements recently shown to arise in the strongly-coupled limit of the E8 × E8 heterotic string (M-theory), including a no-scale-like Kähler potential, the identification of the string scale with the gauge coupling unification scale, and the onset of supersymmetry breaking at an intermediate scale determined by the size of the 11th dimension of M-theory. We also study the phenomenological consequences of such scenario, which include a rather constrained sparticle spectrum within the reach of present-generation particle accelerators.

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17

Ahn, Changhyun. "N=1 Conformal Supergravity and Twistor-String Theory." Journal of High Energy Physics 2004, no. 10 (October 28, 2004): 064. http://dx.doi.org/10.1088/1126-6708/2004/10/064.

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18

Gutperle, Michael. "S-brane Solutions in String Theory." International Journal of Modern Physics A 20, no. 15 (June 20, 2005): 3434–37. http://dx.doi.org/10.1142/s0217751x0502673x.

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19

Buchel, Alex, and James T. Liu. "Gauged supergravity from type IIB string theory on manifolds." Nuclear Physics B 771, no. 1-2 (May 2007): 93–112. http://dx.doi.org/10.1016/j.nuclphysb.2007.03.001.

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20

Dolan, Louise, and Jay N. Ihry. "Conformal supergravity tree amplitudes from open twistor string theory." Nuclear Physics B 819, no. 3 (October 2009): 375–99. http://dx.doi.org/10.1016/j.nuclphysb.2009.04.003.

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21

Covi, Laura, Marta Gomez-Reino, Christian Gross, Jan Louis, Gonzalo A. Palma, and Claudio A. Scrucca. "Constraints on modular inflation in supergravity and string theory." Journal of High Energy Physics 2008, no. 08 (August 18, 2008): 055. http://dx.doi.org/10.1088/1126-6708/2008/08/055.

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22

Kawamura, Yoshiharu. "On Low-Energy Theory from General Supergravity." Progress of Theoretical Physics Supplement 123 (1996): 421–29. http://dx.doi.org/10.1143/ptps.123.421.

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23

LÜST, DIETER, and STEFAN THEISEN. "EXCEPTIONAL GROUPS IN STRING THEORY." International Journal of Modern Physics A 04, no. 17 (October 20, 1989): 4513–33. http://dx.doi.org/10.1142/s0217751x89001916.

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We review the occurrence of exceptional groups in string theory: their dual role as gauge symmetry and as a symmetry unifying space-time, superconformal ghost and internal degrees of freedom. In both cases the relation to the extended world-sheet supersymmetries is discussed in detail. This is used to construct the supermultiplet structure of the massless sectors of all supergravity theories possible in string theory, in even space-time dimensions between four and ten.

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24

Andrey, Christopher, and Claudio A. Scrucca. "Mildly sequestered supergravity models and their realization in string theory." Nuclear Physics B 834, no. 1-2 (July 2010): 363–89. http://dx.doi.org/10.1016/j.nuclphysb.2010.03.024.

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25

Tripathy, Prasanta K. "Non-Supersymmetric Attractors in String Theory and Gauged Supergravity." Nuclear Physics B - Proceedings Supplements 251-252 (June 2014): 33–37. http://dx.doi.org/10.1016/j.nuclphysbps.2014.04.006.

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26

Saulina, N. A., M. V. Terentiev, and K. N. Zyablyuk. "Five-Brane Lagrangian with Loop Corrections in Field-Theory Limit." International Journal of Modern Physics A 12, no. 25 (October 10, 1997): 4559–80. http://dx.doi.org/10.1142/s0217751x97002462.

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Equations of motion and the Lagrangian are derived explicitly for dual D = 10, N = 1 supergravity considered as a field theory limit of a five-brane. It is used the mass-shell solution of heterotic string Bianchi identities obtained in the two-dimensional σ-model two-loop approximation and in the tree-level heterotic string approximation. As a result the dual supergravity Lagrangian is derived in the one-loop five-brane approximation and in the lowest six-dimensional σ-model approximation.

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27

AHN, CHANGHYUN. "${\mathcal N} = 2$ CONFORMAL SUPERGRAVITY FROM TWISTOR-STRING THEORY." International Journal of Modern Physics A 21, no. 18 (July 20, 2006): 3733–59. http://dx.doi.org/10.1142/s0217751x06033787.

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A chiral superfield strength in [Formula: see text] conformal supergravity at linearized level is obtained by acting two superspace derivatives on [Formula: see text] chiral superfield strength which can be described in terms of [Formula: see text] twistor superfields. By decomposing SU (4)R representation of [Formula: see text] twistor superfields into the SU (2)R representation with an invariant U (1)R charge, the surviving [Formula: see text] twistor superfields contain the physical states of [Formula: see text] conformal supergravity. These [Formula: see text] twistor superfields are functions of homogeneous coordinates of weighted complex projective space WCP3|4 where the two weighted fermionic coordinates have weight -1 and 3.

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28

Berman, David S., Chris D. A. Blair, Emanuel Malek, and Malcolm J. Perry. "The OD, D geometry of string theory." International Journal of Modern Physics A 29, no. 15 (May 30, 2014): 1450080. http://dx.doi.org/10.1142/s0217751x14500808.

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We construct an action for double field theory using a metric connection that is compatible with both the generalised metric and the OD, D structure. The connection is simultaneously torsionful and flat. Using this connection, one may construct a proper covariant derivative for double field theory. We then write the doubled action in terms of the generalised torsion of this connection. This action then exactly reproduces that required for double field theory and gauged supergravity.

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29

Reid-Edwards, R. A., and B. Spanjaard. "𝒩 = 4 gauged supergravity from duality-twist compactifications of string theory." Journal of High Energy Physics 2008, no. 12 (December 12, 2008): 052. http://dx.doi.org/10.1088/1126-6708/2008/12/052.

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30

Green, Michael B., Jorge G. Russo, and Pierre Vanhove. "Non-renormalisation conditions in type II string theory and maximal supergravity." Journal of High Energy Physics 2007, no. 02 (February 28, 2007): 099. http://dx.doi.org/10.1088/1126-6708/2007/02/099.

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31

HAYASHI, MITSUO J., TOMOKI WATANABE, ICHIRO AIZAWA, and KOICHI AKETO. "DILATONIC INFLATION AND SUSY BREAKING IN STRING-INSPIRED SUPERGRAVITY." Modern Physics Letters A 18, no. 39 (December 21, 2003): 2785–93. http://dx.doi.org/10.1142/s0217732303012465.

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The theory of inflation will be investigated as well as supersymmetry breaking in the context of supergravity, incorporating the target-space duality and the nonperturbative gaugino condensation in the hidden sector. We found an inflationary trajectory of a dilaton field and a condensate field which breaks supersymmetry at once. The model satisfies the slow-roll condition which solves the η-problem. When the particle rolls down along the minimized trajectory of the potential V(S,Y) at a duality invariant point of T=1, we can obtain the e-fold value ~57. And then the cosmological parameters obtained from our model well match the recent WMAP data combined with other experiments. This observation suggests one to consider the string-inspired supergravity as a fundamental theory of the evolution of the universe as well as the particle theory.

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32

BONINI, MARISA, EDI GAVA, and ROBERTO IENGO. "AMPLITUDES IN THE N=2 STRING." Modern Physics Letters A 06, no. 09 (March 21, 1991): 795–803. http://dx.doi.org/10.1142/s0217732391000828.

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We study the properties of amplitudes in the closed string theory based on the N=2 worldsheet supergravity. The one-loop correction to the three-point amplitude is computed and compared to the effective field theory result. We discuss the peculiar kinematics arising from the (2, 2) signature of the space-time and its role in the factorization properties of the amplitudes.

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33

DISTLER, JACQUES, ZVONIMIR HLOUSEK, and HIKARU KAWAI. "SUPER-LIOUVILLE THEORY AS A TWO-DIMENSIONAL, SUPERCONFORMAL SUPERGRAVITY THEORY." International Journal of Modern Physics A 05, no. 02 (January 20, 1990): 391–414. http://dx.doi.org/10.1142/s0217751x90000180.

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In this paper we extend our previous results on the bosonic Liouville theory, to the supersymmetric case. As in the bosonic case, we find that the quantization of the N=1 theory is limited to the region D≤1. We compute the exact critical exponents and the analogue of the Hausdorff dimension of super random surfaces. Our procedure is manifestly covariant and our results hold for the surface of arbitrary topology. We also examine the N=2, O(2) string theory and find that it appears to be well-defined for all D.

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34

Antoniadis, Ignatios, and Rob Knoops. "Gauge R-symmetry and de Sitter vacua in supergravity and string theory." Nuclear Physics B 886 (September 2014): 43–62. http://dx.doi.org/10.1016/j.nuclphysb.2014.06.008.

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35

Green, Michael B., Jorge G. Russo, and Pierre Vanhove. "Modular properties of two-loop maximal supergravity and connections with string theory." Journal of High Energy Physics 2008, no. 07 (July 29, 2008): 126. http://dx.doi.org/10.1088/1126-6708/2008/07/126.

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36

Kikuchi, Y., and C. Marzban. "Low-energy effective Lagrangian of heterotic string theory." Physical Review D 35, no. 4 (February 15, 1987): 1400–1403. http://dx.doi.org/10.1103/physrevd.35.1400.

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37

Kar, Sayan. "Naked singularities in low-energy, effective string theory." Classical and Quantum Gravity 16, no. 1 (January 1, 1999): 101–15. http://dx.doi.org/10.1088/0264-9381/16/1/008.

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38

Saadat, H., B. P. Tanabchi, and A. M. Saadat. "String-Loop Effect in Low-Energy Effective Theory." International Journal of Theoretical Physics 49, no. 5 (February 24, 2010): 1018–22. http://dx.doi.org/10.1007/s10773-010-0280-y.

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39

Moss, Ian G. "Boundary terms for supergravity and low energy heterotic M-theory." Nuclear Physics B 729, no. 1-2 (November 2005): 179–202. http://dx.doi.org/10.1016/j.nuclphysb.2005.09.023.

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40

GATES, S. JAMES, and J. W. DURACHTA. "GAUGE TWO-FORM IN D=4, N=4 SUPERGEOMETRY WITH SU(4) SUPERSYMMETRY." Modern Physics Letters A 04, no. 21 (October 20, 1989): 2007–16. http://dx.doi.org/10.1142/s0217732389002264.

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We employ a gauge two-form [Formula: see text] in place of the pseudoscalar B' to produce a version of on-shell D=4, N=4 superspace supergravity with SU(4) symmetry. The replacement is accomplished using the Chern-Simons forms associated with the six spin-1 fields of N=4 supergravity. Finally, a Green-Schwarz action is presented and the relation of the theory to the N=4, D=4 heterotic string is exhibited.

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41

NILLES, HANS PETER. "GAUGINO CONDENSATION AND SUPERSYMMETRY BREAKDOWN." International Journal of Modern Physics A 05, no. 22 (November 20, 1990): 4199–223. http://dx.doi.org/10.1142/s0217751x90001744.

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We review the status of dynamical supersymmetry breakdown through the mechanism of gaugino condensation. As in the case of hidden-sector supergravity models, such a process seems to be particularly attractive in the framework of effective Lagrangians that describe the low-energy behaviour of string theories.

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42

BELLUCCI, S. "D=10 SUPERSPACE GEOMETRY AND HETEROTIC SUPERSTRING THEORY (I)." Modern Physics Letters A 03, no. 18 (December 1988): 1775–84. http://dx.doi.org/10.1142/s0217732388002130.

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Using a Weyl transformation in superspace, we provide a noncanonical formulation of standard D=10, N=1 supergravity, including the gauge matter sector. This formulation turns out to be ideally suited for carrying out the renormalization of the Green-Schwarz σ-model describing the D=10 heterotic string propagating in a curved background space. By reducing the superspace results to the component level, we derive the supersymmetry transformation laws for the component fields of the theory.

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43

Waldram, Daniel. "Charged stringlike solutions of low-energy heterotic string theory." Physical Review D 47, no. 6 (March 15, 1993): 2528–35. http://dx.doi.org/10.1103/physrevd.47.2528.

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44

Antonov, D. V. "Gluodynamics string as a low-energy limit of the universal confining string theory." Physics Letters B 427, no. 3-4 (May 1998): 274–82. http://dx.doi.org/10.1016/s0370-2693(98)00337-2.

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45

PAL, SHESANSU SEKHAR. "A NOTE ON NONCOMMUTATIVE STRING THEORY AND ITS LOW ENERGY LIMIT." International Journal of Modern Physics A 18, no. 10 (April 20, 2003): 1733–47. http://dx.doi.org/10.1142/s0217751x03014162.

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The noncommutative string theory is described by embedding open string theory in a constant second rank antisymmetric Bμν field and the noncommutative gauge theory is defined by a deformed ⋆ product. As a check, the study of various scattering amplitudes in both noncommutative string and noncommutative gauge theory confirms that in the α′ → 0 limit, the noncommutative string theoretic amplitude goes over to the noncommutative gauge theoretic amplitude and the couplings are related as [Formula: see text]. Furthermore, we show that in this limit there will not be any correction to the gauge theoretic action because of the absence of massive modes. We get sin/cos factors in the scattering amplitudes depending on the odd/even number of external photons.

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46

ALVAREZ-GAUMÉ, L., H. ITOYAMA, J. L. MAÑES, and A. ZADRA. "SUPERLOOP EQUATIONS AND TWO-DIMENSIONAL SUPERGRAVITY." International Journal of Modern Physics A 07, no. 21 (August 20, 1992): 5337–67. http://dx.doi.org/10.1142/s0217751x92002441.

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We propose a discrete model whose continuum limit reproduces the string susceptibility and the scaling dimensions of (2, 4m) minimal superconformal models coupled to 2D supergravity. The basic assumption in our presentation is a set of super-Virasoro constraints imposed on the partition function. We recover the Neveu-Schwarz and Ramond sectors of the theory, and we are also able to evaluate all planar loop correlation functions in the continuum limit. We find evidence to identify the integrable hierarchy of nonlinear equations describing the double scaling limit as a supersymmetric generalization of KP studied by Rabin.

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Sagnotti, A. "Low-ℓ CMB from string-scale SUSY breaking?" Modern Physics Letters A 32, no. 01 (December 15, 2016): 1730001. http://dx.doi.org/10.1142/s0217732317300014.

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Models of inflation are instructive playgrounds for supersymmetry (SUSY) breaking in Supergravity and String Theory. In particular, combinations of branes and orientifolds that are not mutually BPS can lead to brane SUSY breaking, a phenomenon where nonlinear realizations are accompanied, in tachyon-free vacua, by the emergence of steep exponential potentials. When combined with milder terms, these exponentials can lead to slow-roll after a fast ascent and a turning point. This leaves behind distinctive patterns of scalar perturbations, where pre-inflationary peaks can lie well apart from an almost scale invariant profile. I review recent attempts to connect these power spectra to the low-[Formula: see text] cosmic microwave background (CMB), and a corresponding one-parameter extension of Lambda cold dark matter ([Formula: see text]CDM) with a low-frequency cut [Formula: see text]. A detailed likelihood analysis led to [Formula: see text], at 99.4% confidence level, in an extended Galactic mask with [Formula: see text], to be compared with a nearby value at 88.5% in the standard Planck 2015 mask with [Formula: see text]. In these scenarios, one would be confronted, in the CMB, with relics of an epoch of deceleration that preceded the onset of slow-roll.

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Bhowmick, Samrat. "Implication of U-duality for black branes in string/M-theory." Modern Physics Letters A 31, no. 01 (January 3, 2016): 1650001. http://dx.doi.org/10.1142/s0217732316500012.

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U-duality symmetry of M-theory and S- and T-duality of string theory can be used to study various black brane solutions. We explore some aspect of this idea here. This symmetry can be used to get relations among various components of the metric of the black brane. These relations in turn give relations among various components of the energy–momentum tensor. We show that, using these relations, without knowing the explicit form of form fields, we can get the black brane solutions. These features were studied previously in the context of M-theory. Here, we extensively studied them in string theory (type II supergravity). We also show that this formulation works for exotic branes. We give an example of a time-dependent system where this method is essential.

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LOPEZ, JORGE L., and D. V. NANOPOULOS. "CLOSING THE UNIVERSE BY RELAXING THE COSMOLOGICAL CONSTANT." Modern Physics Letters A 09, no. 30 (September 28, 1994): 2755–60. http://dx.doi.org/10.1142/s0217732394002604.

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We consider a string-inspired no-scale SU (5) × U (1) supergravity model. In this model there is a negative contribution to the vacuum energy, which may be suitably canceled by a positive contribution typically present in string theory. One may then end up with a vacuum energy which brings many cosmological observations into better agreement with theoretical expectations, and a fixed value for the present abundance of neutralinos. We delineate the regions of parameter space allowed in this scenario, and study the ensuing predictions for the sparticle and Higgs-boson masses in this model.

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Siahaan, Haryanto M. "Accelerating black holes in the low energy heterotic string theory." Physics Letters B 782 (July 2018): 594–601. http://dx.doi.org/10.1016/j.physletb.2018.06.004.

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