### A new rolling tachyon solution of cubic string field theoryA new rolling tachyon solution of cubic string field theory

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 Author Forini, V. ♦ Grignani, G. ♦ Nardelli, G. Source arXiv.org Content type Text File Format PDF Date of Submission 2005-02-17 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics Subject Keyword High Energy Physics - Theory ♦ Astrophysics ♦ General Relativity and Quantum Cosmology ♦ physics:astro-ph ♦ physics:gr-qc ♦ physics:hep-th Abstract We present a new analytic time dependent solution of cubic string field theory at the lowest order in the level truncation scheme. The tachyon profile we have found is a bounce in time, a $C^{\infty}$ function which represents an almost exact solution, with an extremely good degree of accuracy, of the classical equations of motion of the truncated string field theory. Such a finite energy solution describes a tachyon which at $x^0=-\infty$ is at the maximum of the potential, at later times rolls toward the stable minimum and then up to the other side of the potential toward the inversion point and thenback to the unstable maximum for $x^0\to+\infty$. The energy-momentum tensor associated with this rolling tachyon solution can be explicitly computed. The energy density is constant, the pressure is an even function of time which can change sign while the tachyon rolls toward the minimum of its potential. A new form of tachyon matter is realized which might be relevant for cosmological applications. Description Reference: JHEP0503:079,2005 Educational Use Research Learning Resource Type Article Page Count 18