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arXiv 0910.1632astro-ph.CO
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暗能量的量子产生

Quantum Generation of Dark Energy

A. de la Macorra, F. Briscese

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15 pages 9 figures
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摘要：

我们提出了一种类型的暗能量模型，其中的粒子的暗能量φ是动态产生的量子跃迁在非常低的能量。跃迁发生的尺度取决于φ和相对论性场varphi之间相互作用的强度g。我们表明，g \simeq 10^{-12}给出了一个生成尺度E_gen simeq eV，其截面sigma simeq 1 pb接近于在去耦时的WIMP截面sigma_w simeq pb。粒子的数密度n_φ是方程中的源项。它产生了标量势v（phi），这是宇宙后期加速的原因。由于φ的出现可能是在非常低的尺度上，接近于现在，宇宙学符合问题可以简单地解释为耦合常数的大小。我们将暗能量与暴胀统一为一个单一的标量场φ，并且我们对暴胀和暗能量使用相同的势v。然而，在暴胀之后，φ完全衰减，并以E_RH propto h ^2 m_Pl的尺度重新加热宇宙，其中h是SM粒子和varphi之间的耦合。场φ从光谱中消失，从再加热直到其再生，因此它不会干扰标准的减速辐射/物质宇宙学模型，从而允许成功的统一方案。引起暴胀子衰变的相同相互作用项解释了φ的后期再生。我们提出了一个简单的模型，其中g和h耦合的强度由膨胀标度E_I设定，g=h^2 propto E_I/m_Pl，给出再加热标度E_RH propto E_I= 100 TeV和Φ产生标度E_gen propto E_I^2/m_pl=eV << E_RH。

英文摘要：

We present a type of dark energy models where the particles of dark energy phi are dynamically produced via a quantum transition at very low energies. The scale where the transition takes places depends on the strength g of the interaction between phi and a relativistic field varphi. We show that a g \simeq 10^{-12} gives a generation scale E_gen simeq eV with a cross section sigma simeq 1 pb close to the WIMPs cross section sigma_w simeq pb at decoupling. The number density n_phi of the ϕparticles are a source term in the eq. of motion of phi and it generates the scalar potential v(phi) responsible for the late time acceleration of our universe. Since the appearance of phi may be at very low scales, close to present time, the cosmological coincidence problem can be explained simply due to the size of the coupling constant. We unify dark energy with inflation in terms of a single scalar field phi, and we use the same potential v for inflation and dark energy. However, after inflation phi decays completely and reheats the universe at a scale E_RH propto h^2 m_Pl, where h is the coupling between the SM particles and varphi. The field phi disappears from the spectrum during, from reheating until its re-generation, and therefore it does not interfere with the standard decelerating radiation/matter cosmological model allowing for a successful unification scheme. The same interaction term that gives rise to the inflaton decay accounts for the late time re-generation of phi. We present a simple model where the strength of the g and h couplings are set by the inflation scale E_I with g=h^2 propto E_I/m_Pl giving a reheating scale E_RH propto E_I=100TeV and phi-generation scale E_gen propto E_I^2/m_pl=eV << E_RH.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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