TeV-Scale Strings

Berenstein, David

doi:10.1146/annurev-nucl-102313-025342

Cited by 19 publications

(17 citation statements)

References 117 publications

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“…3 Such a scenario is displayed in figure 1, where the Standard Model sector is localized on a small region of the full Calabi-Yau manifold. Note that the cycles wrapped by the SM D-brane sector are small, thus reproducing the observed SM gauge couplings, while the overall volume of the Calabi-Yau is large, allowing for a string scale in the TeV region opening the possibility for the direct detection of string excitations [45,46].…”

Section: Jhep12(2014)059mentioning

confidence: 62%

Production of light stringy states

Anastasopoulos¹,

Richter

2014

J. High Energ. Phys.

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Abstract:We discuss the direct production of light stringy states. Those states correspond to the lightest stringy excitations localized at the intersection of two D-brane stacks and their mass can be parametrically smaller than the string scale. Thus in a low string scale scenario one may observe stringy signatures at LHC even in the absence of the usual string resonances. We compute the tree level string scattering amplitude involving two gauge bosons and two such light stringy states. We give the squared amplitude summed over all polarization and gauge configuration and eventually apply the result to the quark sector of a D-brane realization of the Standard Model.

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Section: Jhep12(2014)059mentioning

confidence: 62%

Production of light stringy states

Anastasopoulos¹,

Richter

2014

J. High Energ. Phys.

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“…These could include Z s from anomalous U (1) s [293], TeV-scale black holes [294], and various stringy excitations [295][296][297][298], including Kaluza-Klein states, winding modes, and Regge trajectories of higher-spin states. 28 For a general review, see [300].…”

Section: Low String Scalementioning

confidence: 99%

TASI Lectures on Remnants from the String Landscape

Halverson¹,

Langacker²

2018

Proceedings of Theoretical Advanced Study Institute Summer School 2017 "Physics at the Fundamental Frontier" — PoS(TASI2017)

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Superstring theories are very promising theoretically, but the enormous landscape of string vacua and the (likely) very large underlying string scale imply that they may never be tested directly. Nevertheless, concrete constructions consistent with the observed world frequently lead to observable remnants, i.e., new particles or features that are apparently accidental consequences of the ultraviolet theory and that are typically not motivated by specific shortcomings of the standard models of particle physics or cosmology. For example, moduli, axions, large extended gauge sectors, additional Z gauge bosons, extended Higgs/Higgsino sectors, and quasi-chiral exotics are extremely common. They motivate alternative cosmological paradigms and could lead to observable signatures at the LHC. Similar features can emerge in other standard model extensions, but in the stringy case they are more likely to occur in isolation and not as part of a more complete TeV-scale structure. Conversely, some common aspects of the infinite "landscape" of field theories, such as large representations, are expected to be very rare in the string landscape, and observation of features definitively in the swampland could lead to falsification. In this article, common stringy remnants and their phenomenology are surveyed, and implications for indirectly supporting or casting doubt on string theory are discussed.1

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“…Note that the current constant electric field limit in laboratory is 8 order of magnitude smaller than the one required for producing the Schwinger pair production which is E ∼ m 2 e ∼ 10 −7 GeV 2 with m e the electron mass. The current constraint for string scale M s = 1/ √ α ′ is from a few TeV upto the order of 10 16 ∼ 10 17 GeV (for example, see [18]). If we take one of D3 branes as our own world, even taking E ∼ 10 −7 GeV 2 and √ α ′ = 1/M s ∼ 10 −3 GeV −1 , we have the above ratio r = ν 0 /4π ∼ 10 −11 , very tiny.…”

Section: The Open String Pair Production Enhancementmentioning

confidence: 99%

Remark on the open string pair production enhancement

Jia

2019

Physics Letters B

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Recent studies by one of the present authors along with his collaborators in [1][2][3][4] show that there exist the so-called open string pair production for a possible simplest system of two Dp branes, placed parallel at a separation and with each carrying different electric flux, in Type II superstring theories. Further this pair production can be greatly enhanced when a magnetic flux, sharing no common field strength index with the electric one, is added, implying then p ≥ 3. Given this, one may wonder if further enhancement can be achieved by adding more magnetic flux(es) in a similar fashion. In this paper, we explore this possibility. It turns out that adding more such magnetic flux diminishes rather than enhances the pair production rate. This actually implies that the largest enhancement occurs at p = 3 when the same realistic electric and magnetic fluxes are applied for all p ≥ 3. Curiously one of D3 branes may be our own world and if so, the enhancement gives a possible opportunity to detect the pair production, therefore to test the underlying string theories.

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TeV-Scale Strings

Cited by 19 publications

References 117 publications

Production of light stringy states

Production of light stringy states

TASI Lectures on Remnants from the String Landscape

Remark on the open string pair production enhancement

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