منابع مشابه
Tachyon field in cosmology
We study cosmological effects of homogeneous tachyon field as dark energy. We concentrate on two different scalar field potentials, the inverse square potential and the exponential potential. These models have a unique feature that the matter density parameter and the density parameter for tachyons remain comparable for a large range in redshift. It is shown that there exists a range of paramet...
متن کاملField Theory of Tachyon Matter
We propose a field theory for describing the tachyon on a brane-antibrane system near the minimum of the potential. This field theory realizes two known properties of the tachyon effective action: 1) absence of plane-wave solutions around the minimum, and 2) exponential fall off of the pressure at late time as the tachyon field evolves from any spatially homogeneous initial configuration toward...
متن کاملTachyon Condensation in Cubic Superstring Field Theory
It has been conjectured that at the stationary point of the tachyon potential for the non-BPS D-brane or brane-anti-D-brane pair of superstring theories, the negative energy density cancels the brane tension. We study this conjecture using a cubic superstring field theory with insertion of a double-step inverse picture changing operator. We compute the tachyon potential on levels 1 and 4, obtai...
متن کاملCosmological tachyon from cubic string field theory
The classical dynamics of the tachyon scalar field of cubic string field theory is considered on a cosmological background. Starting from a nonlocal action with arbitrary tachyon potential, which encodes the bosonic and several supersymmetric cases, we study the equations of motion in the Hamilton–Jacobi formalism and with a generalized Friedmann equation, appliable in braneworld or modified gr...
متن کاملUnorientable Boundary Superstring Field Theory with Tachyon Field
We use the BSFT method to study the unoriented open string theory. The partition function on the Möbius strip is calculated. We find that, at the one-loop level, the divergence coming from planar graph and unoriented graph cancel each other as expected.
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ژورنال
عنوان ژورنال: Modern Physics Letters A
سال: 2007
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s0217732307021809