Breaking BEC

Kovtun, A. V.; Zantedeschi, Michael

doi:10.1007/jhep07(2020)212

Cited by 12 publications

(8 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We see that the number of species enhances the amplitude and simultaneously narrows the window (32). In general, a scenario with N species N ∼ obs 60 , puts the effect near the observational accuracy.…”

Section: Observational Signatures and Power Of Speciesmentioning

confidence: 74%

“…The corresponding quantum break-time is expected to obey (16), where the parameters α, N, t cl must be understood as the non-gravitational characteristics of the source. For example, N is the occupation number of a scalar field in the coherent state, α is its self-coupling, and t cl is the corresponding classical time (see [1,3,28,[31][32][33][34] for applications of quantum breaking to some inflationary scenarios and other systems. )…”

Section: S-matrix and Quantum Breakingmentioning

confidence: 99%

See 1 more Smart Citation

S-Matrix and Anomaly of de Sitter

Dvali

2020

Symmetry

View full text Add to dashboard Cite

S-matrix formulation of gravity excludes de Sitter vacua. In particular, this is organic to string theory. The S-matrix constraint is enforced by an anomalous quantum break-time proportional to the inverse values of gravitational and/or string couplings. Due to this, de Sitter can satisfy the conditions for a valid vacuum only at the expense of trivializing the graviton and closed-string S-matrices. At non-zero gravitational and string couplings, de Sitter is deformed by corpuscular 1/N effects, similarly to Witten–Veneziano mechanism in QCD with N colors. In this picture, an S-matrix formulation of Einstein gravity, such as string theory, nullifies an outstanding cosmological puzzle. We discuss possible observational signatures which are especially interesting in theories with a large number of particle species. Species can enhance the primordial quantum imprints to potentially observable level even if the standard inflaton fluctuations are negligible.

show abstract

Section: Observational Signatures and Power Of Speciesmentioning

confidence: 74%

Section: S-matrix and Quantum Breakingmentioning

confidence: 99%

S-Matrix and Anomaly of de Sitter

Dvali

2020

Symmetry

View full text Add to dashboard Cite

show abstract

“…The time-scale (58) signals a complete break-down of the semi-classical picture. The quantum break-time has been verified in various contexts [40][41][42][43][44].…”

Section: E Entanglement and Page's Curvementioning

confidence: 92%

“…In fact, the memory modes become exactly gapless in the collective limit (29). At finite N , their gaps scale as (41).…”

Section: Memory Modesmentioning

confidence: 99%

Quantum Gravity in Species Regime

Dvali

2021

Preprint

View full text Add to dashboard Cite

A large number of particle species allows to formulate quantum gravity in a special double-scaling limit, the species limit. In this regime, quantum gravitational amplitudes simplify substantially. An infinite set of perturbative corrections, that usually blur the picture, vanishes, whereas the collective and non-perturbative effects can be cleanly extracted. Such are the effects that control physics of black holes and of de Sitter and their entanglement curves. In string theory example, we show that the entropy of open strings matches the Gibbons-Hawking entropy of a would-be de Sitter state at the point of saturation of the species bound. This shows, from yet another angle, why quantum gravity/string theory cannot tolerate a de Sitter vacuum. Finally, we discuss various observational implications.

show abstract

“…The question of quantum depletion of the axion condensate has been investigated in [19]. In [20,21], quantum dynamics of condensates with a conserved charge was analyzed within 2-particle-irreducible formalism (c.f. [22]) in the context of (1+1)-dimensional self-interacting scalar field theory, and conclusions analogous to [16,19] were drawn.…”

Section: Introductionmentioning

confidence: 99%

Background Field Method and Initial-Time Singularity for Coherent States

Berezhiani,

Cintia,

Zantedeschi

2021

Preprint

View full text Add to dashboard Cite

The background field method is adopted for studying the dynamics of coherent states within an interacting scalar field theory. Focusing on a coherent state that corresponds to the homogeneous condensate, the quantum depletion of the expectation value of the field-operator is demonstrated to be due to the annihilation of the condensate constituents into relativistic quanta. Moreover, due to the fact that the initial field acceleration and energy for the nonsqueezed coherent states are determined in terms of bare coupling constant, instead of the renormalized one, the appearance of perturbative singularities is shown to be inevitable. In other words, consistency of these states requires the finiteness of the bare coupling constant, through the resummation.

show abstract

Breaking BEC

Cited by 12 publications

References 18 publications

S-Matrix and Anomaly of de Sitter

S-Matrix and Anomaly of de Sitter

Quantum Gravity in Species Regime

Background Field Method and Initial-Time Singularity for Coherent States

Contact Info

Product

Resources

About