Natural theory of dark energy

Bordin, Lorenzo; Cunillera, Francesc; Lehébel, Antoine; Padilla, Antonio

doi:10.1103/physrevd.101.085012

Cited by 8 publications

(17 citation statements)

References 81 publications

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“…One of the first applications was in cosmology, where they have been employed to construct models in which the cosmological constant was generated dynamically [1][2][3]. More recently they have been studied, for example, in inflation [4][5][6][7][8][9][10] and in relation to naturalness problems [11][12][13][14][15][16][17]. Three-forms have been also embedded into supersymmetric models, both in global supersymmetry [18][19][20][21][22][23][24][25][26][27] and in supergravity [28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Three-forms and Fayet-Iliopoulos terms in supergravity: scanning Planck mass and BPS domain walls

Cribiori

Farakos

Tringas

2020

J. High Energ. Phys.

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We embed a new three-form vector multiplet in N = 1 supergravity and we show that it can be used to generate dynamically the Hilbert-Einstein term. We then recast the theory into the standard Freedman model and we argue that a pure Fayet-Iliopoulos term is in tension with the Weak Gravity Conjecture. Finally, we couple the three-form to a super-membrane and study BPS domain walls within matter-coupled supergravity. In these models, the Planck mass takes different values on the domain wall sides.

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Section: Introductionmentioning

confidence: 99%

Three-forms and Fayet-Iliopoulos terms in supergravity: scanning Planck mass and BPS domain walls

Cribiori

Farakos

Tringas

2020

J. High Energ. Phys.

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“…Can we exploit the distance conjecture to bring the odds even further in? One speculative possibility is to consider dark energy a consequence of clockwork dynamics [56]. The clockwork construction allows for the existence of a naturally light dark energy field, in a theory with uniquely high scale couplings.…”

Section: Jhep10(2021)055 4 Discussionmentioning

confidence: 99%

A stringy perspective on the coincidence problem

Cunillera

Padilla

2021

J. High Energ. Phys.

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We argue that, for string compactifications broadly consistent with swampland constraints, dark energy is likely to signal the beginning of the end of our universe as we know it, perhaps even through decompactification, with possible implications for the cosmological coincidence problem. Thanks to the scarcity (absence?) of stable de Sitter vacua, dark energy in string theory is assumed to take the form of a quintessence field in slow roll. As it rolls, a tower of heavy states will generically descend, triggering an apocalyptic phase transition in the low energy cosmological dynamics after at most a few hundred Hubble times. As a result, dark energy domination cannot continue indefinitely and there is at least a percentage chance that we find ourselves in the first Hubble epoch. We use a toy model of quintessence coupled to a tower of heavy states to explicitly demonstrate the breakdown in the cosmological dynamics as the tower becomes light. This occurs through a large number of corresponding particles being produced after a certain time, overwhelming quintessence. We also discuss some implications for early universe inflation.

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“…For related models utilising a similar premise see Refs. [24,26,31,32]. This is the cost of entry for all versions of the sequester scenario.…”

Section: Discussionmentioning

confidence: 99%

“…Third, the Jordan frame formulation generates a residual cosmological-like term. This is the last term in (24). Assuming κ 2 ∼ M 2 P and σ ′ ∼ σ′ ∼ O(1), it yields a residual cosmological constant of order µ 4 .…”

Section: B Jordan-frame Formulationmentioning

confidence: 93%

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Ultraviolet sensitivity of the cosmological sequester

Lawrence,

Seery

2020

Preprint

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We revisit the "sequester" proposal of Kaloper, Padilla and collaborators, in which the amplitude of the cosmological constant is decoupled from large contributions due to loops containing Standard Model particles. We review the different formulations of the model that have appeared in the literature, and estimate the importance of a particular class of quantum corrections-those that dress the interaction between the "rigid" scalars and infrared properties of the spacetime such as its 4-volume and integrated curvature. In formulations that do not adequately sequester graviton loops we argue that dressing of these interactions causes further failures of complete sequestration. We estimate the size of the effect and find that it is typically smaller than the cosmological term directly induced by loops containing a single virtual graviton. Meanwhile, in the most developed formulation of the scenario (where a rigid scalar couples to the Gauss-Bonnet density), this dressing can be absorbed into a rescaling of the rigid fields and is therefore harmless.

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Natural theory of dark energy

Cited by 8 publications

References 81 publications

Three-forms and Fayet-Iliopoulos terms in supergravity: scanning Planck mass and BPS domain walls

Three-forms and Fayet-Iliopoulos terms in supergravity: scanning Planck mass and BPS domain walls

A stringy perspective on the coincidence problem

Ultraviolet sensitivity of the cosmological sequester

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