Higuchi bound

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August undefined, 2024

WebJun 1, 1988 · In this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is … WebLast, Higuchi's group-theoretic analysis of the eigenmodes showed that there is a lower bound for the mass parameter of integer-spin fields, below which the fields can only be non-unitary 3 ....

Possible signatures of the inflationary particle content: spin-2 …

WebMar 29, 2010 · 1. It is worth to mention that in a recent paper [7] a mechanism was described to modify the Higuchi bound in a de Sitter Universe by adding a suitable coupled ghost; in our work we will consider only canonically normalized scalar fields. See also [8] for the study of the behavior of a different model of infrared-modified gravity on FRW … WebHiguchi bound contain helicity modes with a negative norm, hence they are prohibited by unitarity. Immedi-Ms4 H2 Ms2 H2 s m 2 FIG. 1: Higuchi bound vs linear Regge trajectory: The shaded region is prohibited by the Higuchi bound (1). The linear Regge trajectory (the straight line) enters the prohib-ited region at a critical spin s c ’M2 s =H 2. hillion stock news

Pauli–Fierz gravitons on Friedmann–Robertson–Walker background

WebJan 31, 2024 · In particular it ensures that the Higuchi bound is satisfied at all scales, that no Vainshtein mechanism is needed to satisfy Solar System experiments, and that the strong coupling scale is always above the scale of cosmological interest all … WebMar 1, 2024 · Our interesting observation is the abrupt behavior of the system just when the theory touches the Higuchi bound [17], where the constraint structure of the system has a completely different character. Exactly at the Higuchi bound, one chain of constraints with four second class elements changes to a first class chain with three elements. WebThe existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton... smart fiber wifi

A note on string excitations and the Higuchi bound – DOAJ

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WebThis inequality, called Higuchi bound [6], is a consequence of the (approximate) de Sitter symmetries during in ation. It implies that particles with spin decay outside the horizon faster than 1=a, where ais the scale factor. This implies that they leave a small e ect in the squeezed limit of correlation functions. hillipert magical windmillWebJul 4, 2024 · Interestingly, as a consequence of accelerated expansion, there exists a maximum spin for each Regge trajectory, which is helpful to make the spectrum consistent with the Higuchi bound, but at the same time, it could be an obstruction to stringy UV completion based on an infinite higher-spin tower. hillion watson

"WebMar 12, 2024 · In this letter we show that the Higuchi bound can be circumvented in an alternative description of massive spin-2 particles known as $\mathcal {L} (a_1)$ models. … " - Higuchi bound

Higuchi bound

Pauli–Fierz gravitons on Friedmann–Robertson–Walker background

WebSep 23, 2016 · The International School for Advanced Studies (SISSA) was founded in 1978 and was the first institution in Italy to promote post-graduate courses leading to a Doctor … WebJan 29, 2024 · [PR] Madoka Higuchi Tied up. By. VakaOsciosa. Watch. Published: Jan 30, 2024. 783 Favourites. 3 Comments. 41.1K Views. gagged tiedup idolmaster …

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Webcalled Higuchi bound [10], m2 ≥ sðs−1ÞH2; ð1Þ on the mass of higher-spin particles in de Sitter space [11]. Here, m and s are the mass and spin of a particle, respectively, and H ¼ 1=R is the Hubble parameter with R being the de Sitter radius. Massive higher-spin particles violating the Higuchi bound contain helicity modes with a WebAug 4, 2024 · We discuss the conditions to satisfy the Higuchi bound and to avoid gradient instabilities in the scalar sector for cosmological solutions in singly coupled bimetric …

WebDec 7, 2024 · Interestingly, as a consequence of accelerated expansion, there exists a maximum spin for each Regge trajectory, which is helpful to make the spectrum … WebThe value of mg is precisely the Spin-2 gauge line appearing on the Λ - m 2 g phase diagram for Spin-2, the partially massless gauge lines introduced by Deser & Waldron in the m 2 g, Λ) phase plane and described as the Higuchi bound m 2 g = 2 Λ /3. Note that this graviton is unitary with only four polarization degrees of freedom (helicities ...

WebMar 12, 2024 · In this letter we show that the Higuchi bound can be circumvented in an alternative description of massive spin-2 particles known as $\mathcal {L} (a_1)$ models. In maximally symmetric spaces the... WebJan 24, 2024 · In the context of bimetric theories, the stability of the homogeneous and isotropic universe requires (see footnote 2) the generalized Higuchi bound condition to be satisfied. In the standard bigravity theory on a de Sitter background spacetime, it reduces to the classical Higuchi bound ( 32 ).

WebFeb 22, 2024 · Mass and spin for classical strings in. We demonstrate that all rigidly rotating strings with center of mass at the origin of the static patch satisfy the Higuchi bound. This extends the observation of Noumi et al. for the open GKP-like string to all solutions of the Larsen-Sanchez class. We argue that strings violating the bound end up ...

WebOct 9, 2024 · The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton foliation, since this breaks the de Sitter isometries. The action for these states can be constructed within the Effective Field Theory of Inflation, or ... hillion stockWebMar 23, 2024 · Higuchi Bound on Slow Roll Inflation and the Swampland Marvin Lüben, Dieter Lust In this paper we study the implications of the generalized Higuchi bound on … smart fidelity investments nowWebJun 1, 1988 · A note on string excitations and the Higuchi bound. Physics Letters B, Volume 799, 2024, Article 135067. Show abstract. In this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is always a point along the Regge trajectory where the ... hillis clark martinWebIn this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is always a … hillis barWebWe extend the notion of the Higuchi bound and partial masslessness to ghost-free nonlinear bimetric theories. This can be achieved in a simple way by first considering linear massive spin-2 perturbations around maximally symmetric background solutions, for which the linear gauge symmetry at the Higuchi bound is easily identified. ... smart field service メタウォーターWebOct 1, 2024 · In this setup, the minimal inflationary field content interacts with the massive spin-2 field through dRGT interactions, thus guaranteeing the absence of Boulware-Deser ghostly degrees of freedom. The unitarity requirement on spinning particles, known as Higuchi bound, plays a crucial role for the size of the observable signal. Authors: smart fibres limitedWebDec 10, 2024 · The Higuchi bound [3] is a bound on the mass of fields with spin two or higher in de Sitter space which captures the absence of ghosts. It states that a field of … hillis clark martin \\u0026 peterson