Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

T. M.C. Abbott; F. B. Abdalla; S. Avila; M. Banerji; E. Baxter; K. Bechtol; M. R. Becker; E. Bertin; J. Blazek; S. L. Bridle; D. Brooks; D. Brout; D. L. Burke; A. Campos; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; F. J. Castander; R. Cawthon; C. Chang; A. Chen; M. Crocce; C. E. Cunha; L. N. Da Costa; C. Davis; J. De Vicente; J. Derose; S. Desai; E. Di Valentino; H. T. Diehl; J. P. Dietrich; S. Dodelson; P. Doel; A. Drlica-Wagner; T. F. Eifler; J. Elvin-Poole; A. E. Evrard; E. Fernandez; A. Ferté; B. Flaugher; P. Fosalba; J. Frieman; J. García-Bellido; E. Gaztanaga; D. W. Gerdes; T. Giannantonio; D. Gruen; R. A. Gruendl; J. Gschwend; G. Gutierrez; W. G. Hartley; D. L. Hollowood; K. Honscheid; B. Hoyle; D. Huterer; B. Jain; T. Jeltema; M. W.G. Johnson; M. D. Johnson; A. G. Kim; E. Krause; K. Kuehn; N. Kuropatkin; O. Lahav; S. Lee; P. Lemos; C. D. Leonard; T. S. Li; A. R. Liddle; M. Lima; H. Lin; M. A.G. Maia; J. L. Marshall; P. Martini; F. Menanteau; C. J. Miller; R. Miquel; V. Miranda; J. J. Mohr; J. Muir; R. C. Nichol; B. Nord; R. L.C. Ogando; A. A. Plazas; M. Raveri; R. P. Rollins; A. K. Romer; A. Roodman; R. Rosenfeld; S. Samuroff; E. Sanchez; V. Scarpine; R. Schindler; M. Schubnell; D. Scolnic; L. F. Secco; S. Serrano; I. Sevilla-Noarbe; M. Smith; M. Soares-Santos

doi:10.1103/PhysRevD.99.123505

Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

T. M.C. Abbott, F. B. Abdalla, S. Avila, M. Banerji, E. Baxter, K. Bechtol, M. R. Becker, E. Bertin, J. Blazek, S. L. Bridle, D. Brooks, D. Brout, D. L. Burke, A. Campos, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, R. Cawthon, C. ChangA. Chen, M. Crocce, C. E. Cunha, L. N. Da Costa, C. Davis, J. De Vicente, J. Derose, S. Desai, E. Di Valentino, H. T. Diehl, J. P. Dietrich, S. Dodelson, P. Doel, A. Drlica-Wagner, T. F. Eifler, J. Elvin-Poole, A. E. Evrard, E. Fernandez, A. Ferté, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, T. Giannantonio, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, W. G. Hartley, D. L. Hollowood, K. Honscheid, B. Hoyle, D. Huterer, B. Jain, T. Jeltema, M. W.G. Johnson, M. D. Johnson, A. G. Kim, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, S. Lee, P. Lemos, C. D. Leonard, T. S. Li, A. R. Liddle, M. Lima, H. Lin, M. A.G. Maia, J. L. Marshall, P. Martini, F. Menanteau, C. J. Miller, R. Miquel, V. Miranda, J. J. Mohr, J. Muir, R. C. Nichol, B. Nord, R. L.C. Ogando, A. A. Plazas, M. Raveri, R. P. Rollins, A. K. Romer, A. Roodman, R. Rosenfeld, S. Samuroff, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, D. Scolnic, L. F. Secco, S. Serrano, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos

Department of Morphological Sciences

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Abstract

© 2019 American Physical Society. We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.

Original language	English
Article number	123505
Journal	Physical Review D
Volume	99
DOIs	https://doi.org/10.1103/PhysRevD.99.123505
Publication status	Published - 7 Jun 2019

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10.1103/PhysRevD.99.123505

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Abbott, T. M. C., Abdalla, F. B., Avila, S., Banerji, M., Baxter, E., Bechtol, K., Becker, M. R., Bertin, E., Blazek, J., Bridle, S. L., Brooks, D., Brout, D., Burke, D. L., Campos, A., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Castander, F. J., Cawthon, R., ... Soares-Santos, M. (2019). Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing. Physical Review D, 99, [123505]. https://doi.org/10.1103/PhysRevD.99.123505

Abbott, T. M.C. ; Abdalla, F. B. ; Avila, S. ; Banerji, M. ; Baxter, E. ; Bechtol, K. ; Becker, M. R. ; Bertin, E. ; Blazek, J. ; Bridle, S. L. ; Brooks, D. ; Brout, D. ; Burke, D. L. ; Campos, A. ; Carnero Rosell, A. ; Carrasco Kind, M. ; Carretero, J. ; Castander, F. J. ; Cawthon, R. ; Chang, C. ; Chen, A. ; Crocce, M. ; Cunha, C. E. ; Da Costa, L. N. ; Davis, C. ; De Vicente, J. ; Derose, J. ; Desai, S. ; Di Valentino, E. ; Diehl, H. T. ; Dietrich, J. P. ; Dodelson, S. ; Doel, P. ; Drlica-Wagner, A. ; Eifler, T. F. ; Elvin-Poole, J. ; Evrard, A. E. ; Fernandez, E. ; Ferté, A. ; Flaugher, B. ; Fosalba, P. ; Frieman, J. ; García-Bellido, J. ; Gaztanaga, E. ; Gerdes, D. W. ; Giannantonio, T. ; Gruen, D. ; Gruendl, R. A. ; Gschwend, J. ; Gutierrez, G. ; Hartley, W. G. ; Hollowood, D. L. ; Honscheid, K. ; Hoyle, B. ; Huterer, D. ; Jain, B. ; Jeltema, T. ; Johnson, M. W.G. ; Johnson, M. D. ; Kim, A. G. ; Krause, E. ; Kuehn, K. ; Kuropatkin, N. ; Lahav, O. ; Lee, S. ; Lemos, P. ; Leonard, C. D. ; Li, T. S. ; Liddle, A. R. ; Lima, M. ; Lin, H. ; Maia, M. A.G. ; Marshall, J. L. ; Martini, P. ; Menanteau, F. ; Miller, C. J. ; Miquel, R. ; Miranda, V. ; Mohr, J. J. ; Muir, J. ; Nichol, R. C. ; Nord, B. ; Ogando, R. L.C. ; Plazas, A. A. ; Raveri, M. ; Rollins, R. P. ; Romer, A. K. ; Roodman, A. ; Rosenfeld, R. ; Samuroff, S. ; Sanchez, E. ; Scarpine, V. ; Schindler, R. ; Schubnell, M. ; Scolnic, D. ; Secco, L. F. ; Serrano, S. ; Sevilla-Noarbe, I. ; Smith, M. ; Soares-Santos, M. / Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing. In: Physical Review D. 2019 ; Vol. 99.

@article{cf72d137b23b42b896d03e48e7f1dd1d,

title = "Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing",

abstract = "{\textcopyright} 2019 American Physical Society. We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.",

author = "Abbott, {T. M.C.} and Abdalla, {F. B.} and S. Avila and M. Banerji and E. Baxter and K. Bechtol and Becker, {M. R.} and E. Bertin and J. Blazek and Bridle, {S. L.} and D. Brooks and D. Brout and Burke, {D. L.} and A. Campos and {Carnero Rosell}, A. and {Carrasco Kind}, M. and J. Carretero and Castander, {F. J.} and R. Cawthon and C. Chang and A. Chen and M. Crocce and Cunha, {C. E.} and {Da Costa}, {L. N.} and C. Davis and {De Vicente}, J. and J. Derose and S. Desai and {Di Valentino}, E. and Diehl, {H. T.} and Dietrich, {J. P.} and S. Dodelson and P. Doel and A. Drlica-Wagner and Eifler, {T. F.} and J. Elvin-Poole and Evrard, {A. E.} and E. Fernandez and A. Fert{\'e} and B. Flaugher and P. Fosalba and J. Frieman and J. Garc{\'i}a-Bellido and E. Gaztanaga and Gerdes, {D. W.} and T. Giannantonio and D. Gruen and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and Hartley, {W. G.} and Hollowood, {D. L.} and K. Honscheid and B. Hoyle and D. Huterer and B. Jain and T. Jeltema and Johnson, {M. W.G.} and Johnson, {M. D.} and Kim, {A. G.} and E. Krause and K. Kuehn and N. Kuropatkin and O. Lahav and S. Lee and P. Lemos and Leonard, {C. D.} and Li, {T. S.} and Liddle, {A. R.} and M. Lima and H. Lin and Maia, {M. A.G.} and Marshall, {J. L.} and P. Martini and F. Menanteau and Miller, {C. J.} and R. Miquel and V. Miranda and Mohr, {J. J.} and J. Muir and Nichol, {R. C.} and B. Nord and Ogando, {R. L.C.} and Plazas, {A. A.} and M. Raveri and Rollins, {R. P.} and Romer, {A. K.} and A. Roodman and R. Rosenfeld and S. Samuroff and E. Sanchez and V. Scarpine and R. Schindler and M. Schubnell and D. Scolnic and Secco, {L. F.} and S. Serrano and I. Sevilla-Noarbe and M. Smith and M. Soares-Santos",

year = "2019",

month = jun,

day = "7",

doi = "10.1103/PhysRevD.99.123505",

language = "English",

volume = "99",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

}

Abbott, TMC, Abdalla, FB, Avila, S, Banerji, M, Baxter, E, Bechtol, K, Becker, MR, Bertin, E, Blazek, J, Bridle, SL, Brooks, D, Brout, D, Burke, DL, Campos, A, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Castander, FJ, Cawthon, R, Chang, C, Chen, A, Crocce, M, Cunha, CE, Da Costa, LN, Davis, C, De Vicente, J, Derose, J, Desai, S, Di Valentino, E, Diehl, HT, Dietrich, JP, Dodelson, S, Doel, P, Drlica-Wagner, A, Eifler, TF, Elvin-Poole, J, Evrard, AE, Fernandez, E, Ferté, A, Flaugher, B, Fosalba, P, Frieman, J, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Giannantonio, T, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Hartley, WG, Hollowood, DL, Honscheid, K, Hoyle, B, Huterer, D, Jain, B, Jeltema, T, Johnson, MWG, Johnson, MD, Kim, AG, Krause, E, Kuehn, K, Kuropatkin, N, Lahav, O, Lee, S, Lemos, P, Leonard, CD, Li, TS, Liddle, AR, Lima, M, Lin, H, Maia, MAG, Marshall, JL, Martini, P, Menanteau, F, Miller, CJ, Miquel, R, Miranda, V, Mohr, JJ, Muir, J, Nichol, RC, Nord, B, Ogando, RLC, Plazas, AA, Raveri, M, Rollins, RP, Romer, AK, Roodman, A, Rosenfeld, R, Samuroff, S, Sanchez, E, Scarpine, V, Schindler, R, Schubnell, M, Scolnic, D, Secco, LF, Serrano, S, Sevilla-Noarbe, I, Smith, M & Soares-Santos, M 2019, 'Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing', Physical Review D, vol. 99, 123505. https://doi.org/10.1103/PhysRevD.99.123505

Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing. / Abbott, T. M.C.; Abdalla, F. B.; Avila, S.; Banerji, M.; Baxter, E.; Bechtol, K.; Becker, M. R.; Bertin, E.; Blazek, J.; Bridle, S. L.; Brooks, D.; Brout, D.; Burke, D. L.; Campos, A.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F. J.; Cawthon, R.; Chang, C.; Chen, A.; Crocce, M.; Cunha, C. E.; Da Costa, L. N.; Davis, C.; De Vicente, J.; Derose, J.; Desai, S.; Di Valentino, E.; Diehl, H. T.; Dietrich, J. P.; Dodelson, S.; Doel, P.; Drlica-Wagner, A.; Eifler, T. F.; Elvin-Poole, J.; Evrard, A. E.; Fernandez, E.; Ferté, A.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; Huterer, D.; Jain, B.; Jeltema, T.; Johnson, M. W.G.; Johnson, M. D.; Kim, A. G.; Krause, E.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lee, S.; Lemos, P.; Leonard, C. D.; Li, T. S.; Liddle, A. R.; Lima, M.; Lin, H.; Maia, M. A.G.; Marshall, J. L.; Martini, P.; Menanteau, F.; Miller, C. J.; Miquel, R.; Miranda, V.; Mohr, J. J.; Muir, J.; Nichol, R. C.; Nord, B.; Ogando, R. L.C.; Plazas, A. A.; Raveri, M.; Rollins, R. P.; Romer, A. K.; Roodman, A.; Rosenfeld, R.; Samuroff, S.; Sanchez, E.; Scarpine, V.; Schindler, R.; Schubnell, M.; Scolnic, D.; Secco, L. F.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Soares-Santos, M.

In: Physical Review D, Vol. 99, 123505, 07.06.2019.

Research output: Contribution to journal › Article › Research

TY - JOUR

T1 - Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

AU - Abbott, T. M.C.

AU - Abdalla, F. B.

AU - Avila, S.

AU - Banerji, M.

AU - Baxter, E.

AU - Bechtol, K.

AU - Becker, M. R.

AU - Bertin, E.

AU - Blazek, J.

AU - Bridle, S. L.

AU - Brooks, D.

AU - Brout, D.

AU - Burke, D. L.

AU - Campos, A.

AU - Carnero Rosell, A.

AU - Carrasco Kind, M.

AU - Carretero, J.

AU - Castander, F. J.

AU - Cawthon, R.

AU - Chang, C.

AU - Chen, A.

AU - Crocce, M.

AU - Cunha, C. E.

AU - Da Costa, L. N.

AU - Davis, C.

AU - De Vicente, J.

AU - Derose, J.

AU - Desai, S.

AU - Di Valentino, E.

AU - Diehl, H. T.

AU - Dietrich, J. P.

AU - Dodelson, S.

AU - Doel, P.

AU - Drlica-Wagner, A.

AU - Eifler, T. F.

AU - Elvin-Poole, J.

AU - Evrard, A. E.

AU - Fernandez, E.

AU - Ferté, A.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Giannantonio, T.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - Hartley, W. G.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - Hoyle, B.

AU - Huterer, D.

AU - Jain, B.

AU - Jeltema, T.

AU - Johnson, M. W.G.

AU - Johnson, M. D.

AU - Kim, A. G.

AU - Krause, E.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Lahav, O.

AU - Lee, S.

AU - Lemos, P.

AU - Leonard, C. D.

AU - Li, T. S.

AU - Liddle, A. R.

AU - Lima, M.

AU - Lin, H.

AU - Maia, M. A.G.

AU - Marshall, J. L.

AU - Martini, P.

AU - Menanteau, F.

AU - Miller, C. J.

AU - Miquel, R.

AU - Miranda, V.

AU - Mohr, J. J.

AU - Muir, J.

AU - Nichol, R. C.

AU - Nord, B.

AU - Ogando, R. L.C.

AU - Plazas, A. A.

AU - Raveri, M.

AU - Rollins, R. P.

AU - Romer, A. K.

AU - Roodman, A.

AU - Rosenfeld, R.

AU - Samuroff, S.

AU - Sanchez, E.

AU - Scarpine, V.

AU - Schindler, R.

AU - Schubnell, M.

AU - Scolnic, D.

AU - Secco, L. F.

AU - Serrano, S.

AU - Sevilla-Noarbe, I.

AU - Smith, M.

AU - Soares-Santos, M.

PY - 2019/6/7

Y1 - 2019/6/7

N2 - © 2019 American Physical Society. We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.

AB - © 2019 American Physical Society. We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.

U2 - 10.1103/PhysRevD.99.123505

DO - 10.1103/PhysRevD.99.123505

M3 - Article

VL - 99

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

M1 - 123505

ER -

Dark Energy Survey year 1 results: Constraints on extended cosmological models from galaxy clustering and weak lensing

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