Unitary inflaton as decaying dark matter

Choi, Soo-Min; Kang, Y.; Lee, Hyun Min; Yamashita, Kimiko

doi:10.1007/jhep05(2019)060

Cited by 36 publications

(26 citation statements)

References 57 publications

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“…Therefore, for αµ 1, the cutoff scale is of order the Planck scale or higher. Moreover, interestingly, even for αµ 1, the cutoff scale is saturated to the order of Planck scale independent of αµ, due to a large rescaling of the inflaton kinetic term [10,11]. But, we take αµ 1 to keep µ M P for α 1 in the later discussion.…”

Section: From Four-form To Non-minimal Gravity Couplingsmentioning

confidence: 99%

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Chaotic inflation with four-form couplings

Lee

2020

Phys. Rev. D

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We consider chaotic inflation models with a pseudo-scalar field containing the couplings to the four-form flux. The four-form coupling to the inflaton induces a quadratic potential while the coexisting non-minimal four-form coupling to gravity generates a non-minimal gravity coupling for the inflaton. The derived inflaton couplings respect the shift symmetry which is broken spontaneously. We discuss the success of inflationary predictions and robustness against higher order terms. Finally, the reheating process through the trace of the energy-momentum tensor is also addressed.

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Section: From Four-form To Non-minimal Gravity Couplingsmentioning

confidence: 99%

“…Before ending the section, we remark the reheating dynamics in our model. Although the inflaton does not couple directly to the Standard Model in Jordan frame, the inflaton couplings are induced in going to the Einstein frame through the trace of the energy-momentum tensor, T µ µ [11], as follows,…”

Section: Inflation From Four-form Couplingsmentioning

confidence: 99%

Chaotic inflation with four-form couplings

Lee

2020

Phys. Rev. D

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“…The unification of the inflaton and dark matter dates back to the seminal papers[30,31]. See also Refs [32][33][34][35][36][37][38][39][40]. for other recent studies.…”

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confidence: 99%

ALP inflation and Big Bang on Earth

Takahashi

Yin

2019

J. High Energ. Phys.

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We study a hilltop inflation model where an axion-like particle (ALP) plays the role of the inflaton. We find that, for a broad class of potentials, the decay constant and the mass at the potential minimum satisfy the relation, m φ ∼ 10 −6 f , to explain the CMB normalization. The ALP is necessarily coupled to the standard model particles for successful reheating. The ALP with the above relation can be searched at beam dump experiments, e.g., the SHiP experiment, if the inflation scale is sufficiently low. In this case, the ALP decays through the interactions that led to the reheating of the Universe. In other words, the Big Bang may be probed at ground-based experiments. *

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“…Refs. [45,46], which study inflaton decay in f (σ)R gravity, virtually counts light degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

“…6 Ref. [46] sketches the derivation of trace anomaly at the one-loop order in Wilsonian renormalization.…”

Section: Introductionmentioning

confidence: 99%

On scalaron decay via the trace of energy-momentum tensor

Kamada

2019

J. High Energ. Phys.

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In some inflation scenarios such as R 2 inflation, a gravitational scalar degrees of freedom called scalaron is identified as inflaton. Scalaron linearly couples to matter via the trace of energy-momentum tensor. We study scenarios with a sequestered matter sector, where the trace of energy-momentum tensor predominantly determines the scalaron coupling to matter. In a sequestered setup, heavy degrees of freedom are expected to decouple from low-energy dynamics. On the other hand, it is non-trivial to see the decoupling since scalaron couples to a mass term of heavy degrees of freedom. Actually, when heavy degrees of freedom carry some gauge charge, the amplitude of scalaron decay to two gauge bosons does not vanish in the heavy mass limit. Here a quantum contribution to the trace of energy-momentum tensor plays an essential role. This quantum contribution is known as trace anomaly or Weyl anomaly. The trace anomaly contribution from heavy degrees of freedom cancels with the contribution from the classical scalaron coupling to a mass term of heavy degrees of freedom. We see how trace anomaly appears both in the Fujikawa method and in dimensional renormalization. In dimensional renormalization, one can evaluate the scalaron decay amplitude in principle at all orders, while it is unclear how to process it beyond the one-loop level in the Fujikawa method. We consider scalaron decay to two gauge bosons via the trace of energy-momentum tensor in quantum electrodynamics with scalars and fermions. We evaluate the decay amplitude at the leading order to demonstrate the decoupling of heavy degrees of freedom.

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Unitary inflaton as decaying dark matter

Cited by 36 publications

References 57 publications

Chaotic inflation with four-form couplings

Chaotic inflation with four-form couplings

ALP inflation and Big Bang on Earth

On scalaron decay via the trace of energy-momentum tensor

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