Production of Purely Gravitational Vector Dark Matter

Ahmed, Aqeel; Grza̧dkowski, Bohdan; Socha, Anna

doi:10.5506/aphyspolb.50.1809

Cited by 9 publications

(15 citation statements)

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“…In particular if the reheating does not happen instantaneously the maximum temperature achieved during the reheating phase can be larger than the temperature at the end of reheating which allows supper-heavy DM production [14]. Recently, there has been a renewed interest in models of gravitational production of DM during and after inflation due to quantum fluctuations [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Gravitational production of vector dark matter

Ahmed

Grza̧dkowski

Socha

2020

J. High Energ. Phys.

119

101

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A model of vector dark matter that communicates with the Standard Model only through gravitational interactions has been investigated. It has been shown in detail how does the canonical quantization of the vector field in varying FLRW geometry implies a tachyonic enhancement of some of its momentum modes. Approximate solutions of the mode equation have been found and verified against exact numerical ones. De Sitter geometry has been assumed during inflation while after inflation a non-standard cosmological era of reheating with a generic equation of state has been adopted which is followed by the radiation-dominated universe. It has been shown that the spectrum of dark vectors produced gravitationally is centered around a characteristic comoving momentum k⋆ that is determined in terms of the mass of the vector mX, the Hubble parameter during in- flation HI, the equation of state parameter w and the efficiency of reheating γ. Regions in the parameter space consistent with the observed dark matter relic abundance have been determined, justifying the gravitational production as a viable mechanism for vector dark matter. The results obtained in this paper are applicable within various possible models of inflation/reheating with non-standard cosmology parametrized effectively by the corresponding equation of state and efficiency of reheating.

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Section: Introductionmentioning

confidence: 99%

Gravitational production of vector dark matter

Ahmed

Grza̧dkowski

Socha

2020

J. High Energ. Phys.

119

101

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“…Such models offer several rather natural mechanisms which can explain production of DM. For example, DM production during inflation period of rapid expansion in the early Universe through quantum fluctuations [3][4][5][6][7][8][9][10][11][12][13][14][15][16], the graviton mediated freeze-in production of DM [17][18][19][20], and production of DM through Planck scale suppressed portals to SM [21][22][23][24]. The observed DM relic abundance can be achieved within these models for a wide range of DM masses from sub eV to the Planck mass.…”

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confidence: 94%

“…For the inflaton field values φ M , the inflaton potential is nearly constant, whereas the end of inflation occurs for φ ∼ M , such that during the reheating phase, the inflaton potential has the polynomial form, i.e., φ 2n . In what follows, we will consider only the case n = 1, which implies w = 0 during reheating epoch (for general case see [39]).…”

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confidence: 99%

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Implications of time-dependent inflaton decay on reheating and dark matter production

Ahmed,

Grzadkowski,

Socha

2021

Preprint

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“…Recently there has been significant studies on implications of the reheating dynamics on the production of DM, see e.g. [29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet freeze-in dark matter through the dilaton portal

Ahmed¹,

Najjari²

2021

Preprint

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We consider a class of models where the Standard Model (SM) and dark matter (DM) belong to a conformal/scale-invariant theory at high energies. The scale invariance is broken spontaneously at scale f , and the corresponding Goldstone boson is the dilaton. In the low-energy theory, we assume DM interacts with the SM only through the dilaton portal suppressed by the conformal breaking scale f . Assuming f TeV, the portal interactions are very feeble, and hence the DM is not in thermal equilibrium with the SM bath. Therefore, ultraviolet freeze-in production of DM is realized through the dilaton portal, which is most effective at the maximum temperature of the SM bath. The temperature evolution critically depends on the reheating dynamics, which we parameterize by a general equation of state w and temperature at the end of reheating T rh . Implications of the reheating dynamics are studied for DM production in this framework. We have identified regions of parameter space that lead to the observed DM relic abundance for a wide range of DM masses and reheating temperatures for a scalar, vector, or fermion DM.

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Production of Purely Gravitational Vector Dark Matter

Abstract: This article gives a short overview of the future high-energy e + e − collider projects. Both, linear and circular colliders offer an excellent potential for precision physics and are shortly discussed.

Cited by 9 publications

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Gravitational production of vector dark matter

Gravitational production of vector dark matter

Implications of time-dependent inflaton decay on reheating and dark matter production

Ultraviolet freeze-in dark matter through the dilaton portal

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