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bouncing cosmology 1cosmological singularity 1ghost-free 1infinite derivative gravity 1tachyon instability 1tensor perturbations 1

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1 paper

gr-qc2026

Is there ghost and tachyon free bounce in UV complete gravity theory?

Hao Hu, Alexey S. Koshelev, Abhishek Naskar

The paper investigates whether analytic infinite‑derivative gravity can produce a non‑singular bouncing universe without ghost or tachyon instabilities, finding that a negative cos…