Gravitational Waves: Echo of the Cosmic Bounce ⚡ экспресс
In non-singular bouncing cosmologies, the effective potential M_p^2 a''/a for primordial gravitational waves features two peaks due to the contraction phase preceding standard expansion. This causes interference of relic gravitational waves between the peaks, analogous to the resonant tunneling effect. The gravitational wave energy spectrum exhibits periodic oscillations in the high-frequency range, sharply distinguishing this model from inflationary scenarios. It is shown that the spectral amplitude reaches the sensitivity of existing and planned gravitational-wave instruments, making the predictions falsifiable. This opens a promising path for experimentally testing non-singular bounce models and searching for new physics in the early Universe.
Standard theory paints the birth of the Universe as an explosion from a point of infinite density. But there is an alternative: first, the cosmos squeezed down to tiny dimensions, and then began to expand — it bounced back, like a spring. This double process left a trace in gravitational waves — ripples in spacetime that still cruise through the cosmos.
Just as two echoes from different walls merge into a shimmering sound, the waves from contraction and expansion overlapped, producing a clear rhythmic pattern. At high frequencies, it looks like an alternation of spikes and dips, unlike the chaotic noise expected from a standard Big Bang.
If Earth-based detectors catch this pulsation, it will confirm that the expansion of the Universe began not from a singularity, but from a bounce. Astonishingly, the signal strength is sufficient to be noticed by already existing observatories. Perhaps we will hear the bounce echo in the coming years.
🎯 Gravitational waves from the Big Bang are chaotic, like radio static, while those from the bounce are rhythmic, like a heartbeat.
🎬 Hear the rhythm of the cosmic bounce.