Bari Pritha, Ricciardone Angelo, Bartolo Nicola, Bertacca Daniele, Matarrese Sabino
Dipartimento di Fisica e Astronomia "G. Galilei," Università degli Studi di Padova, via Marzolo 8, I-35131 Padova, Italy.
INFN, Sezione di Padova, via Marzolo 8, I-35131 Padova, Italy.
Phys Rev Lett. 2022 Aug 26;129(9):091301. doi: 10.1103/PhysRevLett.129.091301.
We study the generation and evolution of second-order energy-density perturbations arising from primordial gravitational waves. Such "tensor-induced scalar modes" approximately evolve as standard linear matter perturbations and may leave observable signatures in the large-scale structure of the Universe. We study the imprint on the matter power spectrum of some primordial models which predict a large gravitational-wave signal at high frequencies. This novel mechanism, in principle, allows us to constrain or detect primordial gravitational waves by looking at specific features in the matter or galaxy power spectrum, thereby allowing us to probe them on a range of scales unexplored so far.
我们研究由原初引力波产生的二阶能量密度微扰的产生与演化。这种“张量诱导标量模式”的演化近似于标准线性物质微扰，并可能在宇宙的大尺度结构中留下可观测的印记。我们研究了一些预测高频处有大引力波信号的原初模型对物质功率谱的影响。原则上，这种新机制使我们能够通过观察物质或星系功率谱中的特定特征来约束或探测原初引力波，从而使我们能够在迄今未探索的一系列尺度上对其进行探测。
