String Theory and Cosmological Phenomena
Summary
String theory seeks to describe fundamental interactions by modelling particles as one-dimensional strings. In efforts to unify quantum mechanics and general relativity, it introduces additional spatial dimensions, flux compactifications and extended objects such as branes. Cosmological phenomena—ranging from the early-universe inflationary epoch to the current phase of accelerated expansion—offer critical testing grounds for string theoretic predictions. Models of dark energy inspired by string compactifications often invoke scalar fields with specific potential shapes, leading to transient or eternal acceleration. Simultaneously, the Swampland programme aims to distinguish low-energy effective field theories that can arise in a consistent quantum gravity framework from those that cannot, imposing constraints on scalar field ranges and potential gradients. Recent theoretical constructions probe the existence and stability of de Sitter and anti-de Sitter vacua in various compactification schemes, examine the role of supersymmetry breaking by fluxes and explore conjectures such as the Trans-Planckian Censorship Conjecture. These endeavours illuminate connections between high-energy string dynamics and observable cosmological parameters, guiding future observational tests of early-universe and dark-energy scenarios.
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String Theory and Cosmological Phenomena publication trend
The graph below shows the total number of articles in string theory and cosmological phenomena across all publications each year (not limited to Nature Index journals).
Technical terms
Quintessence: A dynamical scalar field postulated to drive cosmic acceleration, with a time-varying equation of state.
Swampland Conjecture: A set of proposed criteria that effective field theories must satisfy to admit a consistent embedding in quantum gravity.
De Sitter Vacuum: A metastable solution of Einstein’s equations with positive cosmological constant corresponding to accelerated expansion.
Anti-de Sitter (AdS) Vacuum: A stable solution with negative cosmological constant, often used in holographic dualities.
Flux Compactification: A mechanism in string theory where background fluxes stabilise extra dimensions and determine effective four-dimensional physics.
Trans-Planckian Censorship Conjecture (TCC): A proposal asserting that quantum fluctuations below the Planck scale should remain quantum and not cross the cosmological horizon.
References
- Exponential quintessence: curved, steep and stringy?. Journal of High Energy Physics (2024).
- Distance and de Sitter conjectures on the Swampland. Physics Letters B (2019).
- Supersymmetry breaking by fluxes. Journal of High Energy Physics (2018).
- Trans-Planckian Censorship and the Swampland. Journal of High Energy Physics (2020).
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