D-brane recoil and logarithmic operators

We discuss the partners of the stress energy tensor and their structure in Logarithmic conformal field theories. In particular we draw attention to the fundamental differences between theories with zero and non-zero central charge. However they are both characterised by at least two independent parameters. We show how, by using a generalised Sugawara construction, one can calculate the logarithmic partner of T . We show that such a construction works in the c = −2 theory using the conformal dimension one primary currents which generate a logarithmic extension of the Kac-Moody algebra.

show abstract

“…In particular the field t is not a primary and is purely a descendent field. Given (28,27) and the standard Virasoro algebra:…”

Section: Degenerate Vacuamentioning

confidence: 99%

Stress Energy tensor in LCFT and the Logarithmic Sugawara construction

Kogan

Nichols

2002

J. High Energy Phys.

View full text Add to dashboard Cite

show abstract

“…As discussed in references [10,11,12], the recoil of a D-brane string soliton after interaction with a closed-string state is characterized by a σ model on the string world sheet Σ, that is deformed by a pair of logarithmic operators [15]:…”

Section: Formulation Of D-brane Recoilmentioning

confidence: 99%

“…For reasons of convergence of the world-sheet path integrals we take the space-time {X I , y i } to have Euclidean signature. In the case of D particles [10,11,12], the index I takes the value 0 only, in which case the operators (1) act as deformations of the conformal field theory on the world sheet. The operator u i ∂Σ ∂ n X i D ǫ describes the movement of the D brane induced by the scattering, where u i is its recoil velocity, and y i ∂Σ ∂ n X i C ǫ describes quantum fluctuations in the initial position y i of the D particle.…”

Section: Formulation Of D-brane Recoilmentioning

confidence: 99%

“…In order to realize the logarithmic algebra between the operators C and D (1), one uses as a regulating parameter [10] …”

Section: Formulation Of D-brane Recoilmentioning

confidence: 99%

“…The purpose of this talk is to review such a specific stringy treatment [10,11,12] of the interaction between closed-string particle 'probes' and D-brane black holes (defects). We have developed an approach capable of accommodating the recoil of a D-brane black hole struck by a closed-string 'probe', including also quantum effects associated with higher-genus contributions to the string path integral.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Testing a (Stringy) Model of Quantum Gravity

Mavromatos

2001

Dark Matter in Astro- And Particle Physics

View full text Add to dashboard Cite

Abstract. I discuss a specific model of space-time foam, inspired by the modern nonperturbative approach to string theory (D-branes). The model views our world as a three brane, intersecting with D-particles that represent stringy quantum gravity effects, which can be real or virtual. In this picture, matter is represented generically by (closed or open) strings on the D3 brane propagating in such a background. Scattering of the (matter) strings off the D-particles causes recoil of the latter, which in turn results in a distortion of the surrounding space-time fluid and the formation of (microscopic, i.e. Planckian size) horizons around the defects. As a mean-field result, the dispersion relation of the various particle excitations is modified, leading to non-trivial optical properties of the space time, for instance a non-trivial refractive index for the case of photons or other massless probes. Such models make falsifiable predictions, that may be tested experimentally in the foreseeable future. I describe a few such tests, ranging from observations of light from distant gamma-ray-bursters and ultra high energy cosmic rays, to tests using gravity-wave interferometric devices and terrestrial particle physics experiments involving, for instance, neutral kaons.

show abstract

The Issue of Dark Energy in String Theory

Mavromatos

Lecture Notes in Physics

View full text Add to dashboard Cite

Recent astrophysical observations, pertaining to either high-redshift supernovae or cosmic microwave background temperature fluctuations, as those measured recently by the WMAP satellite, provide us with data of unprecedented accuracy, pointing towards two (related) facts: (i) our Universe is accelerated at present, and (ii) more than 70 % of its energy content consists of an unknown substance, termed dark energy, which is believed responsible for its current acceleration. Both of these facts are a challenge to String theory. In this review I outline briefly the challenges, the problems and possible avenues for research towards a resolution of the Dark Energy issue in string theory.

show abstract

D-brane recoil and logarithmic operators

Cited by 121 publications

References 17 publications

Stress Energy tensor in LCFT and the Logarithmic Sugawara construction

Stress Energy tensor in LCFT and the Logarithmic Sugawara construction

Testing a (Stringy) Model of Quantum Gravity

The Issue of Dark Energy in String Theory

Contact Info

Product

Resources

About