Finite soft terms in string compactifications with broken supersymmetry

Shah, Imran; Thomas, Steven

doi:10.1016/s0370-2693(97)00910-6

Cited by 6 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[64][65][66][67], while numerous other configurations of non-supersymmetric string models have been discussed in refs. [68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84], which have included the study of relations between scales in different schemes [85][86][87][88][89][90][91].…”

Section: Introductionmentioning

confidence: 99%

Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond

Abel

Stewart

2017

Phys. Rev. D

View full text Add to dashboard Cite

Two independent criteria are presented that together guarantee exponential suppression of the two-loop cosmological constant in non-supersymmetric heterotic strings. They are derived by performing calculations in both the full string theory and in its effective field theory, and come respectively from contributions that involve only physical untwisted states, and contributions that include orbifold twisted states. The criteria depend purely on the spectrum and charges, so a model that satisfies them will do so with no fine-tuning. An additional consistency condition (emerging from the so-called separating degeneration limit of the two-loop diagram) is that the one-loop cosmological constant must also be suppressed, by Bose-Fermi degeneracy in the massless spectrum. We comment on the effects of the residual exponentially suppressed one-loop dilaton tadpole, with the conclusion that the remaining instability would be under perturbative control in a generic phenomenological construction. We remark that theories of this kind, that have continued exponential suppression to higher orders, can form the basis for a string implementation of the "naturalness without supersymmetry" idea.

show abstract

Section: Introductionmentioning

confidence: 99%

Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond

Abel

Stewart

2017

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

Solving the hierarchy problem without supersymmetry or extra dimensions: an alternative approach

Dienes

2001

Nuclear Physics B

View full text Add to dashboard Cite

In this paper, we propose a possible new approach towards solving the gauge hierarchy problem without supersymmetry and without extra spacetime dimensions. This approach relies on the finiteness of string theory and the conjectured stability of certain non-supersymmetric string vacua. One crucial ingredient in this approach is the idea of "misaligned supersymmetry", which explains how string theories may be finite even without exhibiting spacetime supersymmetry. This approach towards solving the gauge hierarchy problem is therefore complementary to recent proposals involving both large and small extra spacetime dimensions. This approach may also give a new perspective towards simultaneously solving the cosmological constant problem. * E-mail address: dienes@physics.arizona.edu * More precisely, each separate sequence of integers |g n | with a different value of n (mod 4) obeys (3.11) individually. This is sufficient for our purposes, and will be discussed further in Sect. 4.

show abstract

Strong/weak coupling duality relations for non-supersymmetric string theories

Blum¹,

Dienes²

1998

Nuclear Physics B

114

169

View full text Add to dashboard Cite

Both the supersymmetric SO(32) and E 8 × E 8 heterotic strings in ten dimensions have known strong-coupling duals. However, it has not been known whether there also exist strong-coupling duals for the non-supersymmetric heterotic strings in ten dimensions. In this paper, we construct explicit open-string duals for the circle-compactifications of several of these non-supersymmetric theories, among them the tachyon-free SO(16) × SO(16) string. Our method involves the construction of heterotic and open-string interpolating models that continuously connect non-supersymmetric strings to supersymmetric strings. We find that our non-supersymmetric dual theories have exactly the same massless spectra as their heterotic counterparts within a certain range of our interpolations. We also develop a novel method for analyzing the solitons of non-supersymmetric open-string theories, and find that the solitons of our dual theories also agree with their heterotic counterparts. These are therefore the first known examples of strong/weak coupling duality relations between nonsupersymmetric, tachyon-free string theories. Finally, the existence of these strong-coupling duals allows us to examine the non-perturbative stability of these strings, and we propose a phase diagram for the behavior of these strings as a function of coupling and radius* Throughout this paper, we shall use the phrase "Type I" to indicate the general class of openstring theories, regardless of whether they have spacetime supersymmetry. Similarly, we shall use the phrase "Type II" to signify closed strings with left-and right-moving worldsheet supersymmetry, regardless of whether they have spacetime supersymmetry. These terms will therefore be used in the same way as the general term "heterotic". * Note, in particular, that we are only algebraically rewriting the loop amplitude, not constructing to the tree amplitude, and consequently we may simply define t ′ = 1/t as a convenient variable and do not require the tree variable ℓ = 1/8t.

show abstract

Finite soft terms in string compactifications with broken supersymmetry

Cited by 6 publications

References 28 publications

Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond

Exponential suppression of the cosmological constant in nonsupersymmetric string vacua at two loops and beyond

Solving the hierarchy problem without supersymmetry or extra dimensions: an alternative approach

Strong/weak coupling duality relations for non-supersymmetric string theories

Contact Info

Product

Resources

About