Vector dark matter production at the end of inflation
Vector dark matter production at the end of inflation
复制标题
DOI：
10.1088/1475-7516/2019/04/015
复制
发表时间：
2019-04-01
影响因子：
6.4
通讯作者：
Vega-Morales, Roberto
中科院分区：
文献类型：
--
作者：
Bastero-Gil, Mar;Santiago, Jose;Vega-Morales, Roberto
已经证明，大质量矢量玻色子的纵模可以由暴胀涨落产生，并解释宇宙中暗物质的含量。在这项工作中，我们研究的可能性，而不是通过耦合φ F（F）之间的暴胀和矢量场强度的波浪线产生的横模。这样的耦合导致一个快子不稳定性和指数生产的一个横向极化的矢量场，达到最大值接近年底的膨胀。在生产时，质量可以忽略不计，并且矢量相干地相加形成暗电磁场。随着宇宙的膨胀，暗电磁场的能量密度像辐射一样红移，直到其波长延伸到康普顿波长之外。在这一点之后，矢量变成非相对论性的，它们的能量密度像物质一样红移。我们表明，这些极化的横向矢量可以解释所观察到的暗物质遗迹密度在质量范围μ eV到数百GeV。我们还发现，快子生产机制的横向模式可以容纳更大的矢量质量和较低的哈勃尺度的通货膨胀相比，生产机制的纵向模式，通过通货膨胀的波动。
It has been shown that the longitudinal mode of a massive vector boson can be produced by inflationary fluctuations and account for the dark matter content of the Universe. In this work we examine the possibility of instead producing the transverse mode via the coupling phi F (F) over tilde between the inflaton and the vector field strength. Such a coupling leads to a tachyonic instability and exponential production of one transverse polarization of the vector field, reaching its maximum near the end of inflation. At production the mass is negligible and the vectors add up coherently to form a dark electromagnetic field. As the Universe expands, the energy density of the dark electromagnetic field then redshifts like radiation until its wavelength stretches to beyond its Compton wavelength. After this point the vectors become non-relativistic and their energy density redshifts like matter. We show that these polarized transverse vectors can account for the observed dark matter relic density in the mass range mu eV to hundreds of GeV. We also find that the tachyonic production mechanism of the transverse mode can accommodate larger vector masses and lower Hubble scales of inflation compared to the production mechanism for the longitudinal mode via inflationary fluctuations.