Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Shafer, Daniel L."'
Autor:
Riess, Adam G., Rodney, Steven A., Scolnic, Daniel M., Shafer, Daniel L., Strolger, Louis-Gregory, Ferguson, Henry C., Postman, Marc, Graur, Or, Maoz, Dan, Jha, Saurabh W., Mobasher, Bahram, Casertano, Stefano, Hayden, Brian, Molino, Alberto, Hjorth, Jens, Garnavich, Peter M., Jones, David O., Kirshner, Robert P., Koekemoer, Anton M., Grogin, Norman A., Brammer, Gabriel, Hemmati, Shoubaneh, Dickinson, Mark, Challis, Peter M., Wolff, Schuyler, Clubb, Kelsey I., Filippenko, Alexei V., Nayyeri, Hooshang, Vivian, U, Koo, David C., Faber, Sandra M., Kocevski, Dale, Bradley, Larry, Coe, Dan
We present an analysis of 15 Type Ia supernovae (SNe Ia) at redshift z > 1 (9 at 1.5 < z < 2.3) recently discovered in the CANDELS and CLASH Multi-Cycle Treasury programs using WFC3 on the Hubble Space Telescope. We combine these SNe Ia with a new co
Externí odkaz:
http://arxiv.org/abs/1710.00844
Autor:
Huterer, Dragan, Shafer, Daniel L
Publikováno v:
Rep. Prog. Phys. 81 (2018) 016901
The discovery of the accelerating universe in the late 1990s was a watershed moment in modern cosmology, as it indicated the presence of a fundamentally new, dominant contribution to the energy budget of the universe. Evidence for dark energy, the ne
Externí odkaz:
http://arxiv.org/abs/1709.01091
Publikováno v:
JCAP 05 (2017) 015
Peculiar velocities of objects in the nearby universe are correlated due to the gravitational pull of large-scale structure. By measuring these velocities, we have a unique opportunity to test the cosmological model at the lowest redshifts. We perfor
Externí odkaz:
http://arxiv.org/abs/1611.09862
Publikováno v:
JCAP 12 (2015) 033
We revisit the effect of peculiar velocities on low-redshift type Ia supernovae. Velocities introduce an additional guaranteed source of correlations between supernova magnitudes that should be considered in all analyses of nearby supernova samples b
Externí odkaz:
http://arxiv.org/abs/1509.04708
Autor:
Shafer, Daniel L.
Publikováno v:
Phys. Rev. D 91, 103516 (2015)
Late-time power law expansion has been proposed as an alternative to the standard cosmological model and shown to be consistent with some low-redshift data. We test power law expansion against the standard flat $\Lambda$CDM cosmology using goodness-o
Externí odkaz:
http://arxiv.org/abs/1502.05416
Autor:
Shafer, Daniel L., Huterer, Dragan
Publikováno v:
Mon. Not. Roy. Astron. Soc. 447, 2961 (2015)
We develop a general method to "self-calibrate" observations of galaxy clustering with respect to systematics associated with photometric calibration errors. We first point out the danger posed by the multiplicative effect of calibration errors, wher
Externí odkaz:
http://arxiv.org/abs/1410.0035
Autor:
Shafer, Daniel L., Huterer, Dragan
Publikováno v:
Phys. Rev. D 89, 063510 (2014)
Some recent observations provide $> 2\sigma$ evidence for phantom dark energy -- a value of the dark energy equation of state less than the cosmological-constant value of $-1$. We focus on constraining the equation of state by combining current data
Externí odkaz:
http://arxiv.org/abs/1312.1688
Publikováno v:
Phys. Rev. D 86, 103004 (2012)
We study the effects of current systematic errors in Type Ia supernova (SN Ia) measurements on dark energy (DE) constraints using current data from the Supernova Legacy Survey (SNLS). We consider how SN systematic errors affect constraints from combi
Externí odkaz:
http://arxiv.org/abs/1207.4781
Publikováno v:
Phys.Rev.D81:036006,2010
QCD_{AS}, a variant of large N_c QCD in which quarks transform under the color two-index antisymmetric representation, reduces to standard QCD at N_c = 3 and provides an alternative to the usual large N_c extrapolation that uses fundamental represent
Externí odkaz:
http://arxiv.org/abs/0912.1566
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