论文标题
找到通货膨胀的证据和通过CMB调查的银河磁场的起源
Finding Evidence for Inflation and the Origin of Galactic Magnetic Fields with CMB Surveys
论文作者
论文摘要
在星系中观察到的$ $ g磁场的起源尚不清楚。一种有希望的情况是，在通货膨胀期间产生的磁场在MPC尺度上大于0.1 ng，在结构形成期间，绝热压缩到星系中的$ $ g g强度。因此，在重组后，在MPC尺度上检测到高于0.1 ng的标尺不变原始磁场（PMF）将表明银河磁场的通货膨胀起源。这也将提供令人信服的证据，表明发生通货膨胀是因为只有通货膨胀机制才能在MPC尺度上产生如此强大的规模不变磁场。相比之下，将尺度不变的PMF强度限制为0.1 ng低于0.1 ng，这意味着通货膨胀情况并不是主要起源，因为这样的弱PMF不能通过绝热压缩来扩大足够的放大，以产生我们今天观察到的银河系强度。 We find that measurements of anisotropic birefringence by future CMB surveys will be able to improve the sensitivity to Mpc-scale inflationary PMFs by an order of magnitude, and, in particular, that CMB-HD would lower the upper bound to 0.072 nG at the 95% C.L., which is below the critical 0.1 nG threshold for ruling out a purely inflationary origin.如果存在通货膨胀的PMF，我们发现CMB-HD调查将能够以大约3σ$或更高的意义检测到它们，从而提供通货膨胀本身的证据。
The origin of the $μ$G magnetic fields observed in galaxies is unknown. One promising scenario is that magnetic fields generated during inflation, larger than 0.1 nG on Mpc scales, were adiabatically compressed to $μ$G strengths in galaxies during structure formation. Thus, detecting a scale-invariant primordial magnetic field (PMF) above 0.1 nG on Mpc scales just after recombination would indicate an inflationary origin of galactic magnetic fields. This would also provide compelling evidence that inflation occurred since only an inflationary mechanism could generate such a strong, scale-invariant magnetic field on Mpc scales. In contrast, constraining the scale-invariant PMF strength to be below 0.1 nG would imply an inflationary scenario is not the primary origin, since such weak PMFs cannot be amplified enough via adiabatic compression to produce the strength of the galactic fields we observe today. We find that measurements of anisotropic birefringence by future CMB surveys will be able to improve the sensitivity to Mpc-scale inflationary PMFs by an order of magnitude, and, in particular, that CMB-HD would lower the upper bound to 0.072 nG at the 95% C.L., which is below the critical 0.1 nG threshold for ruling out a purely inflationary origin. If inflationary PMFs exist, we find that a CMB-HD survey would be able to detect them with about $3σ$ significance or higher, providing evidence for inflation itself.
