论文标题
通过显式折断的对称筛选机制进行重力过渡
Gravitational transitions via the explicitly broken symmetron screening mechanism
论文作者
论文摘要
我们通过允许对symmetron $ ϕ^4 $电势的显式对称性破坏对称性对称机制来概括对称筛选机制。与形式$ a（ϕ）= 1 +\ frac {ϕ^2} {m^2} $的耦合导致明显破碎的对称性，并有效潜在$ v_ {eff}（frac}（ϕ）=-μ^2（1- \fracρ{μ^2 m^2} 2 m^2}） \ varepsilon ϕ^3+\fracλ{2}η^4 $。由于立方术语引起的显式对称性破裂，我们将此领域称为“ Asymmetron”。对于大物质密度，$ρ>ρ_*\equivμ^2m^2+\ frac {9} {4} {4} \varepsilhηm^2 $该有效电位在$ ϕ = 0 $时具有单个最小值，从而导致一般相对性的恢复，就像通常的Symmetron筛选机制一样。但是，对于低物质密度，由于显式对称性破裂，存在错误的真空和单个真空。预计这将导致一个不稳定的域墙网络网络，其每侧的重力常数$ g $的值略有不同。该网络将与物质过度相互作用不断相互作用，并会导致有趣的观察性特征，可以检测到红移空间中的重力和膨胀率转变。最近已经提出了这种引力过渡，以解决哈勃张力的分辨率。
We generalize the symmetron screening mechanism by allowing for an explicit symmetry breaking of the symmetron $ϕ^4$ potential. A coupling to matter of the form $A(ϕ)=1+\frac{ϕ^2}{M^2}$ leads to an explicitly broken symmetry with effective potential $V_{eff}(ϕ)=-μ^2 (1-\fracρ{μ^2 M^2})ϕ^2 +\fracλ{2}ϕ^4 + 2 \varepsilon ϕ^3+\fracλ{2}η^4$. Due to the explicit symmetry breaking induced by the cubic term we call this field the 'asymmetron'. For large matter density $ρ>ρ_*\equiv μ^2M^2+\frac{9}{4}\varepsilonηM^2$ the effective potential has a single minimum at $ϕ=0$ leading to restoration of General Relativity as in the usual symmetron screening mechanism. For low matter density however, there is a false vacuum and a single true vacuum due to the explicit symmetry breaking. This is expected to lead to an unstable network of domain walls with slightly different value of the gravitational constant $G$ on each side of the wall. This network would be in constant interaction with matter overdensities and would lead to interesting observational signatures which could be detected as gravitational and expansion rate transitions in redshift space. Such a gravitational transition has been recently proposed for the resolution of the Hubble tension.
