Expanded Simons Observatory Could Probe Cosmic Reheating and Inflation Physics
A new preprint proposes that an expanded Simons Observatory, with six Small Aperture Telescopes by 2027, could measure the reheating temperature of the early universe and inflaton couplings if primordial gravitational waves are detected. The study assumes benchmark tensor-to-scalar ratios of r=0.0036 or r=0.01, which would fix the energy scale of inflation in plateau models. Such measurements could connect cosmological observations to laboratory searches for axion-like particles, potentially illuminating the origin of the hot Big Bang.
Researchers have published a preprint on arXiv examining the scientific potential of an expanded Simons Observatory configuration featuring six Small Aperture Telescopes, three more than currently planned, expected to be operational by 2027. The study focuses on what could be learned about cosmic reheating — the poorly understood epoch following inflation during which the universe transitioned to a hot, radiation-dominated state — if primordial gravitational waves are discovered at tensor-to-scalar ratios of r=0.0036 or r=0.01. In popular plateau inflation models, such a detection would tightly constrain the inflationary energy scale and allow order-of-magnitude determination of the reheating temperature and inflaton interaction strength. For the specific scenario of QCD-driven Warm Inflation, the authors find that under optimistic assumptions the reheating temperature and inflaton coupling to gluons could be measured to a precision of a few percent. Crucially, these cosmological measurements would generate concrete, testable predictions for axion experiments on Earth, creating a complementary laboratory pathway to probe the physical mechanism responsible for the initial conditions of the hot Big Bang.
What's missing
The analysis is explicitly conditional on a future detection of primordial gravitational waves, which has not yet occurred; the assumed benchmark r values remain unconfirmed. The 'optimistic assumptions' underpinning the few-percent precision claim for Warm Inflation are not fully quantified in the abstract.
What different sources said
- arXiv astro-phCenter
Observing Cosmic Reheating with the expanded Simons Observatory
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