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Space laser interferometers can determine the thermal history of the early Universe

Kazunori Nakayama, Shun Saito, Yudai Suwa, Jun'ichi Yokoyama

Abstract

It is shown that space-based gravitational wave detectors such as DECIGO and/or Big Bang Observer (BBO) will provide us with invaluable information on the cosmic thermal history after inflation and they will be able to determine the reheat temperature $T_R$ provided that it lies in the range preferred by the cosmological gravitino problem, $T_R\sim 10^{5-9}$ GeV. Therefore it is strongly desired that they will be put into practice as soon as possible.

Space laser interferometers can determine the thermal history of the early Universe

Abstract

It is shown that space-based gravitational wave detectors such as DECIGO and/or Big Bang Observer (BBO) will provide us with invaluable information on the cosmic thermal history after inflation and they will be able to determine the reheat temperature provided that it lies in the range preferred by the cosmological gravitino problem, GeV. Therefore it is strongly desired that they will be put into practice as soon as possible.

Paper Structure

This paper contains 16 equations, 1 figure.

Figures (1)

  • Figure 1: Density parameter of gravitational radiation for different reheat temperature $T_R$ and entropy increase factor $F$ in chaotic inflation with a massive scalar field. Curves without $F$ imply $F=1$. The region above the thick curve with $f\gtrsim 0.1$Hz can be observable by the ultimate DECIGO after its ten years' operation.