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IRIS
The detection of gravitational waves with Advanced LIGO and Advanced Virgo has enabled novel tests of general relativity, including direct study of the polarization of gravitational waves. While general relativity allows for only two tensor gravitational-wave polarizations, general metric theories can additionally predict two vector and two scalar polarizations. The polarization of gravitational waves is encoded in the spectral shape of the stochastic gravitational-wave background, formed by the superposition of cosmological and individually unresolved astrophysical sources. Using data recorded by Advanced LIGO during its first observing run, we search for a stochastic background of genetically polarized gravitational waves. We find no evidence for a background of any polarization, and place the first direct bounds on the contributions of vector and scalar polarizations to the stochastic background. Under log-uniform priors for the energy in each polarization, we limit the energy densities of tensor, vector, and scalar modes at 95% credibility to Omega(T)(0) < 5.58 x 10(-8), Omega(V)(0) < 6.35 x 10(-8), and Omega(S)(0) < 1.08 x 10(-7) at a reference frequency f(0) = 25 Hz.
Search for Tensor, Vector, and Scalar Polarizations in the Stochastic Gravitational-Wave Background / Abbott, B P; Abbott, R; Abbott, T D; Acernese, F; Ackley, K; Adams, C; Adams, T; Addesso, P; Adhikari, R X; Adya, V B; Affeldt, C; Afrough, M; Agarwal, B; Agathos, M; Agatsuma, K; Aggarwal, N; Aguiar, O D; Aiello, L; Ain, A; Ajith, P; Allen, B; Allen, G; Allocca, A; Altin, P A; Amato, A; Ananyeva, A; Anderson, S B; Anderson, W G; Angelova, S V; Antier, S; Appert, S; Arai, K; Araya, M C; Areeda, J S; Arnaud, N; Ascenzi, S; Ashton, G; Ast, M; Aston, S M; Astone, P; Atallah, D V; Aufmuth, P; Aulbert, C; Aultoneal, K; Austin, C; Avila-Alvarez, A; Babak, S; Bacon, P; Bader, M K M; Bae, S; Baker, P T; Baldaccini, F; Ballardin, G; Ballmer, S W; Banagiri, S; Barayoga, J C; Barclay, S E; Barish, B C; Barker, D; Barkett, K; Barone, F; Barr, B; Barsotti, L; Barsuglia, M; Barta, D; Bartlett, J; Bartos, I; Bassiri, R; Basti, A; Batch, J C; Bawaj, M; Bayley, J C; Bazzan, M; Bécsy, B; Beer, C; Bejger, M; 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[10.1103/PhysRevLett.120.201102]
Search for Tensor, Vector, and Scalar Polarizations in the Stochastic Gravitational-Wave Background
Abbott, B P;Abbott, R;Abbott, T D;Acernese, F;Ackley, K;Adams, C;Adams, T;Addesso, P;Adhikari, R X;Adya, V B;Affeldt, C;Afrough, M;Agarwal, B;Agathos, M;Agatsuma, K;Aggarwal, N;Aguiar, O D;Aiello, L;Ain, A;Ajith, P;Allen, B;Allen, G;Allocca, A;Altin, P A;Amato, A;Ananyeva, A;Anderson, S B;Anderson, W G;Angelova, S V;Antier, S;Appert, S;Arai, K;Araya, M C;Areeda, J S;Arnaud, N;Ascenzi, S;Ashton, G;Ast, M;Aston, S M;Astone, P;Atallah, D V;Aufmuth, P;Aulbert, C;AultONeal, K;Austin, C;Avila-Alvarez, A;Babak, S;Bacon, P;Bader, M K M;Bae, S;Baker, P T;Baldaccini, F;Ballardin, G;Ballmer, S W;Banagiri, S;Barayoga, J C;Barclay, S E;Barish, B C;Barker, D;Barkett, K;Barone, F;Barr, B;Barsotti, L;Barsuglia, M;Barta, D;Bartlett, J;Bartos, I;Bassiri, R;Basti, A;Batch, J C;Bawaj, M;Bayley, J C;Bazzan, M;Bécsy, B;Beer, C;Bejger, M;Belahcene, I;Bell, A S;Berger, B K;Bergmann, G;Bero, J J;Berry, C P L;Bersanetti, D;Bertolini, A;Betzwieser, J;Bhagwat, S;Bhandare, R;Bilenko, I A;Billingsley, G;Billman, C 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2018-01-01
Abstract
The detection of gravitational waves with Advanced LIGO and Advanced Virgo has enabled novel tests of general relativity, including direct study of the polarization of gravitational waves. While general relativity allows for only two tensor gravitational-wave polarizations, general metric theories can additionally predict two vector and two scalar polarizations. The polarization of gravitational waves is encoded in the spectral shape of the stochastic gravitational-wave background, formed by the superposition of cosmological and individually unresolved astrophysical sources. Using data recorded by Advanced LIGO during its first observing run, we search for a stochastic background of genetically polarized gravitational waves. We find no evidence for a background of any polarization, and place the first direct bounds on the contributions of vector and scalar polarizations to the stochastic background. Under log-uniform priors for the energy in each polarization, we limit the energy densities of tensor, vector, and scalar modes at 95% credibility to Omega(T)(0) < 5.58 x 10(-8), Omega(V)(0) < 6.35 x 10(-8), and Omega(S)(0) < 1.08 x 10(-7) at a reference frequency f(0) = 25 Hz.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/353771
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
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