BPS Branes in Cosmology

Andrei Linde; Arkady Tseytlin; Lev Kofman; Renata Kallosh

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BPS Branes in Cosmology

Renata Kallosh, Lev Kofman, Andrei Linde, Arkady Tseytlin

High Energy Physics - Theory · Submitted 26 Jun 2001

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim To find a consistent cosmological solution one must use a more general metric ansatz and a complete 5d description of the brane interaction instead of simply adding an effective 4d bulk brane potential V(Y).

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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,972 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.41 · human participants 0.01 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.03 · compares with prior results 0.78 · mentions code or data availability 0.02.

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arXiv listing abstract v1. Results and the main claim are underlined; show every role.

The possibility to study the M/string theory cosmology via 5d bulk & brane action is investigated. The role of the 4-form field in the theory of BPS branes in 5d is clarified. We describe arguments suggesting that the effective 4d description of the universe in the ekpyrotic scenario (hep-th/0103239) should lead to contraction rather than expansion of the universe. To verify these arguments, we study the full 5d action prior to its integration over the 5th dimension. We show that if one adds the potential V(Y) to the action of the bulk brane, then the metric ansatz used in the ekpyrotic scenario does not solve the dilaton and gravitational equations. To find a consistent cosmological solution one must use a more general metric ansatz and a complete 5d description of the brane interaction instead of simply adding an effective 4d bulk brane potential V(Y).

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	The possibility to study the M/string theory cosmology via 5d bulk & brane action is investigated.	contribution 0.62	0.43	0.03	hedged possibility 0.89
s1	The role of the 4-form field in the theory of BPS branes in 5d is clarified.	contribution 0.87	0.70	0.04	asserted 0.99
s2	We describe arguments suggesting that the effective 4d description of the universe in the ekpyrotic scenario (hep-th/0103239) should lead to contraction rather than expansion of the universe.	result 0.38	0.40	0.41	hedged possibility 1.00
s3	To verify these arguments, we study the full 5d action prior to its integration over the 5th dimension.	method 0.68	0.84	0.04	asserted 0.94
s4	We show that if one adds the potential V(Y) to the action of the bulk brane, then the metric ansatz used in the ekpyrotic scenario does not solve the dilaton and gravitational equations.	result 1.00	0.91	0.25	asserted 1.00
s5	To find a consistent cosmological solution one must use a more general metric ansatz and a complete 5d description of the brane interaction instead of simply adding an effective 4d bulk brane potential V(Y).	interpretation 0.57	0.81	0.81	asserted 1.00

What kind of paper the classifier reports this is: theoretical result 0.95 · evidence from proof or derivation 0.96.

What was examined, and what was not

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arXiv listing abstract v1

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full text
figures and tables
references and citing sentences
relations to other papers

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C citations
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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

The possibility to study the M/string theory cosmology via 5d bulk & brane action is investigated. The role of the 4-form field in the theory of BPS branes in 5d is clarified. We describe arguments suggesting that the effective 4d description of the universe in the ekpyrotic scenario (hep-th/0103239) should lead to contraction rather than expansion of the universe. To verify these arguments, we study the full 5d action prior to its integration over the 5th dimension. We show that if one adds the potential V(Y) to the action of the bulk brane, then the metric ansatz used in the ekpyrotic scenario does not solve the dilaton and gravitational equations. To find a consistent cosmological solution one must use a more general metric ansatz and a complete 5d description of the brane interaction instead of simply adding an effective 4d bulk brane potential V(Y).

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References

Forward citations

Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Quantum Nature of the Big Bang: An Analytical and Numerical Investigation
gr-qc 2006-04 conditional novelty 7.0 of 10

In loop quantum cosmology, a flat homogeneous universe with a massless scalar field replaces the big-bang singularity with a deterministic quantum bounce connecting contraction and expansion.
Cosmology With Negative Potentials
hep-th 2002-02 accept novelty 6.0 of 10

A scalar field potential that dips negative forces the universe to turn from expansion to collapse, and this rules out the simplest version of the cyclic universe scenario.
Kasner and Mixmaster behavior in universes with equation of state w \ge 1
hep-th 2003-11 conditional novelty 5.0 of 10

For a contracting universe with equation of state w > 1, anisotropy and curvature become negligible near the crunch, suppressing mixmaster chaos and yielding homogeneous isotropic contraction.
On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations
hep-th 2002-07 conditional novelty 5.0 of 10

Higher-derivative string and quantum corrections smooth the cosmological bounce in Ekpyrotic models, and the resulting curvature perturbation has a blue spectral index of 3 rather than a scale-invariant one.
On the Generation of a Scale-Invariant Spectrum of Adiabatic Fluctuations in Cosmological Models with a Contracting Phase
hep-th 2001-12 conditional novelty 5.0 of 10

A scalar field with a pressureless equation of state in a contracting universe produces a scale-invariant spectrum of curvature perturbations that, the authors argue, passes through a nonsingular bounce into the expan...

Show 4 more citing papers

CMBPol Mission Concept Study: Probing Inflation with CMB Polarization
astro-ph 2008-11 conditional novelty 4.0 of 10

A satellite measuring CMB B-mode polarization could detect primordial gravitational waves down to r about 0.002 and, if r exceeds 0.01, establish that inflation occurred near 10^16 GeV with a super-Planckian inflaton ...
A Critical Review of Classical Bouncing Cosmologies
astro-ph.CO 2014-06 accept novelty 3.0 of 10

Most bouncing cosmologies do not yet match current data or avoid known instabilities, but a few, notably the super-bounce and S-brane bounce, remain viable research directions.
Inflationary Cosmology after Planck 2013
hep-th 2014-02 conditional novelty 3.0 of 10

A broad class of inflationary models, with non-minimal coupling to gravity or a conformal boundary in field space, all predict the same spectral tilt and tensor fraction, landing on the region Planck 2013 prefers.
Inflationary Cosmology
hep-th 2007-05 conditional novelty 2.0 of 10

A 25-year review of inflation arguing that chaotic initial conditions, eternal self-reproduction, and the string landscape form the only currently viable early-universe framework, with CMB data now matching its predictions.

How the literature uses it

6 arXiv papers cite this in 11 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 6 sentences without a confident label

Contests it 4 papers

It is sufficient to say that the large mass and entropy of the universe remained unexplained, instead of solving the homogeneity problem this scenario only made it worse, and instead of the big bang expected in [ref] , there was a big crunch [ref] .

The New Ekpyrotic Ghost · Introduction: Inflation versus Ekpyrosis · contest 0.90
The large mass and entropy of the universe remained unexplained, instead of solving the homogeneity problem this scenario only made it worse, and instead of the big bang expected in [ref] , there was a big crunch [ref] .

On adiabatic perturbations in the ekpyrotic scenario · Introduction · contest 0.81
It is sufficient to say that instead of the big bang expected in [ref] , there was a big crunch [ref] .

Inflationary Cosmology · Ekpyrotic/cyclic scenario · contest 0.90

Cites it as background 1 paper

In all these models, the big bang is replaced by a quantum bounce, evolution is deterministic and all curvature scalars remain finite throughout the evolution.[For other approaches to bouncing models see, e.g. [ref] .

Inflation with the Starobinsky potential in Loop Quantum Cosmology · Introduction · 0.98

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