2018/11/26 by B. S. Acharya, Anshuman Maharana, Acharya, Bobby Samir +3 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1811.10633
openalex publication_date 2018/11/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Light moduli fields in string compactifications can have interesting\nimplications for particle physics and cosmology. Fifth force bounds impose\nstringent constraints on the interactions of such moduli with the visible\nsector. To be consistent with the bounds, they need to be part of hidden\nsectors which interact with the Standard Model with weaker-than-Planck\nsuppressed interactions. We consider scenarios in which the visible sector\ndegrees of freedom are localised in the compactification and light moduli arise\nas closed string degrees of freedom associated with hidden sectors which are\ngeometrically separated (in the extra-dimensions) from the Standard Model.\nKinetic mixings lead to interactions between the moduli and the visible sector\n- we compute these using Kaehler potentials of string/M-theory\ncompactifications. We argue that in general these interactions provide a lower\nbound on the strength of the interactions between the moduli and the visible\nsector. The interactions scale with inverse powers of the volume of the\ncompactification, thus fifth force bounds can be translated to lower bounds on\nthe volume of the extra-dimensions. We find that compactification volumes have\nto be large to evade the bounds. This imposes interesting constraints on\nquintessence model building in string theory. Our results for the strength of\nthe interactions can also be used to quantify the fine-tuning necessary for the\nstability of the potential of a light modulus against quantum corrections\ninvolving visible sector loops.\n