Closed string amplitudes from gauge fixed string field theory

Drukker, Nadav

doi:10.1103/physrevd.67.126004

Cited by 27 publications

(37 citation statements)

References 25 publications

(48 reference statements)

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“…We expect that for (7.1) such amplitudes collapse to the region of moduli space where the open string propagators have zero length, reducing to sphere amplitudes with an extra insertion of |W . The mechanism for such a collapse must be of a somewhat different nature than in [23] or in [41], since here we are using the conventional BRST operator but a highly unconventional state-space.…”

Section: Superstringmentioning

confidence: 99%

Closed strings as imaginary D-branes

2004

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Sen has recently drawn attention to an exact time-dependent Boundary Conformal Field Theory with the space-time interpretation of brane creation and annihilation. An interesting limit of this BCFT is formally equivalent to an array of D-branes located in imaginary time. This raises the question: what is the meaning of D-branes in imaginary time? The answer we propose is that D-branes in imaginary time define purely closed string backgrounds. In particular we prove that the disk scattering amplitude of m closed strings off an arbitrary configuration of imaginary branes is equivalent to a sphere amplitude with m + 1 closed string insertions. The extra puncture is a specific closed string state, generically normalizable, that depends on the details of the brane configuration. We study in some detail the special case of the array of imaginary D-branes related to Sen's BCFT and comment on its space-time interpretation. We point out that a certain limit of our set-up allows to study classical black hole creation and suggests a relation between Choptuik's critical behavior and a phase-transitionà la Gregory-Laflamme. We speculate that open string field theory on imaginary D-branes is dual to string theory on the corresponding closed string background.

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Section: Superstringmentioning

confidence: 99%

Closed strings as imaginary D-branes

2004

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“…This represents a segment of the round sphere if one chooses f = sin σ as in [10], or other metrics on it for different functions.…”

Section: Gauge Fixed Kinetic Operatormentioning

confidence: 99%

“…In [10] the kinetic operator was constructed from the regular energy-momentum tensor, but in fact much of the ghost structure was not investigated there closely. Starting from the exact gauge invariant Q f we learn that we should use the modified energy-momentum tensor, and the extra constant from the pure ghost term.…”

Section: Gauge Fixed Kinetic Operatormentioning

confidence: 99%

“…Starting from the exact gauge invariant Q f we learn that we should use the modified energy-momentum tensor, and the extra constant from the pure ghost term. All the arguments go through, only that we should use the modified world-sheet action on the Riemann surfaces generated by the Feynman rules of [10], with the extra constant modifying the measure.…”

Section: Gauge Fixed Kinetic Operatormentioning

confidence: 99%

“…If the zero is at the boundary, at w = ±1 it must be a double zero. The function | sin σ| chosen throughout most of [10] is not analytic, and probably not a good choice. Fig.…”

Section: Analytic Structure and New Star Productmentioning

confidence: 99%

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On different actions for the vacuum of bosonic string field theory

Drukker

2003

J. High Energy Phys.

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We study a family of kinetic operators in string field theory describing the theory around the closed string vacuum. Those operators are based on the analytical classical solutions of Takahashi and Tanimoto and are analogous to the pure ghost action usually referred to as "vacuum string field theory," but are much more general, and less singular than the pure ghost operator. The closed string vacuum is related to the D-brane vacuum by large, singular, gauge transformations or field redefinition, and all those different representations are related to each other by small gauge transformations. We try to clarify the nature of this singular gauge transformation. We also show that by choosing the Siegel gauge one recovers the propagator proposed in hep-th/0207266 that generates closed string surfaces.

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Determinants of psychosocial factors amongst the oldest old: Longitudinal evidence based on the representative “survey on quality of life and subjective well‐being of the very old in North Rhine‐Westphalia”

Hajek,

Gyasi,

Kretzler

et al. 2023

Int J Geriat Psychiatry

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ObjectivesThere are few studies investigating the determinants of psychosocial outcomes using data exclusively from the oldest old; and even fewer that use longitudinal data. Thus, our aim was to explore the determinants of psychosocial factors (in terms of life satisfaction, loneliness, and depressive symptoms) amongst the oldest old (also stratified by sex) based on representative, longitudinal data from Germany.Methods/DesignData from “Survey on quality of life and subjective well‐being of the very old in North Rhine‐Westphalia (NRW80+)” were used. This study includes community‐dwelling and institutionalized individuals aged 80 years and above (n = 1760 observations in the analytical sample) located in North Rhine‐Westphalia (the most populous state in Germany). The mean age was 86.6 years (SD: 4.3 years). Established instruments were used to quantify life satisfaction, loneliness, and depressive symptoms. Linear FE regressions were used in this study to mitigate the challenge of unobserved heterogeneity. Sex‐stratified regressions were also conducted. Results: Regressions showed that the loss of a spouse was significantly associated with worsening psychosocial factors (in terms of increases in depressive symptoms and loneliness). Furthermore, regressions revealed that increases in functional impairment were significantly associated with poorer psychosocial outcomes.ConclusionsThis longitudinal study enhanced our understanding of the factors contributing to poorer psychosocial outcomes among the oldest old. Efforts to avoid or postpone functional impairment may contribute to more favorable psychosocial outcomes. Moreover, our current study underlines the importance of spousal relationships for psychosocial outcomes in the oldest age group.

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Closed string amplitudes from gauge fixed string field theory

Cited by 27 publications

References 25 publications

Closed strings as imaginary D-branes

Closed strings as imaginary D-branes

On different actions for the vacuum of bosonic string field theory

Determinants of psychosocial factors amongst the oldest old: Longitudinal evidence based on the representative “survey on quality of life and subjective well‐being of the very old in North Rhine‐Westphalia”

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