A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Space and time averaged quantum stress tensor fluctuations (2021)
Wu, P., Ford, L. H., & Schiappacasse, E. D. (2021). Space and time averaged quantum stress tensor fluctuations. Physical Review D, 103(12), Article 125014. https://doi.org/10.1103/PhysRevD.103.125014
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Wu, Peter; Ford, L. H.; Schiappacasse, Enrico D.
Lehti tai sarja: Physical Review D
ISSN: 2470-0010
eISSN: 2470-0029
Julkaisuvuosi: 2021
Ilmestymispäivä: 21.06.2021
Volyymi: 103
Lehden numero: 12
Artikkelinumero: 125014
Kustantaja: American Physical Society (APS)
Julkaisumaa: Yhdysvallat (USA)
Julkaisun kieli: englanti
DOI: https://doi.org/10.1103/PhysRevD.103.125014
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/77161
Julkaisu on rinnakkaistallennettu: https://arxiv.org/abs/2104.04446
Tiivistelmä
We extend previous work on the numerical diagonalization of quantum stress tensor operators in the Minkowski vacuum state, which considered operators averaged in a finite time interval, to operators averaged in a finite spacetime region. Since real experiments occur over finite volumes and durations, physically meaningful fluctuations may be obtained from stress tensor operators averaged by compactly supported sampling functions in space and time. The direct diagonalization, via a Bogoliubov transformation, gives the eigenvalues and the probabilities of measuring those eigenvalues in the vacuum state, from which the underlying probability distribution can be constructed. For the normal-ordered square of the time derivative of a massless scalar field in a spherical cavity with finite degrees of freedom, analysis of the tails of these distributions confirms previous results based on the analytical treatment of the high moments. We find that the probability of large vacuum fluctuations is reduced when spatial averaging is included, but the tail still decreases more slowly than exponentially as the magnitude of the measured eigenvalues increases, suggesting vacuum fluctuations may not always be subdominant to thermal fluctuations and opening up the possibility of experimental observation under the right conditions.
YSO-asiasanat: kosmologia; gravitaatio; gravitaatioaallot; kvanttifysiikka
Liittyvät organisaatiot
Hankkeet, joissa julkaisu on tehty
- Pimeä Universumi
- Kainulainen, Kimmo
- Suomen Akatemia
OKM-raportointi: Kyllä
Raportointivuosi: 2021
JUFO-taso: 2