XXXVIII International Workshop on High Energy Physics and Field Theory “Current issues in gravitation and cosmology”

Dynamical Tension Strings with SSB of target space scale invariance, Dark Energy and Dark Matter

26 нояб. 2026 г., 15:15

45m

Afternoon session 7

Speaker

Eduardo Guendelman (Ben-Gurion University of the Negev (BGU))

Описание

Abstract
The string tensions can be dynamical in the modified measure formalism and appear as an additional dynamical degrees of freedom . These tensions may not be universal, instead, each string generates its own tension. We then consider a new bulk field that can couple to the strings, the tension scalar which changes locally the tension along the world sheet. In the case with two string tensions there is a braneworld solution which gives rise to an induced de Sitter space in the brane, avoiding swampland constraints of the standard string theory. Strings with different tension to ours can appear also as Dark Matter and since they share the same space and compactifications as visible matter, they should lead to Dark copies of the standard model.
Links
1. Constructing de Sitter space and Dark Matter with Dynamical Tension Strings, Eduardo Guendelman, AWARDED HONORABLE MENTION IN THE 2026 GRAVITY RESEARCH FOUNDATION ESSAYS COMPETITION e-Print: 2512.16941, TO APPEAR IN IJMPD
2.Dynamical string tension theories with target space scale invariance SSB and restoration Eduardo Guendelman Published in: Eur.Phys.J.C 85 (2025) 3, 276