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We demonstrate that the integrated gravitational wave signal of Type Iasupernovae (SNe Ia) in the single-degenerate channel out to cosmologicaldistances gives rise to a continuous background to spaceborne gravitationalwave detectors, including the Big Bang Observer (BBO) and Deci-HertzInterferometer Gravitational wave Observatory (DECIGO) planned missions. Thisgravitational wave background from SNe Ia acts as a noise background in thefrequency range 0.1 - 10 Hz, which heretofore was thought to be relatively freefrom astrophysical sources apart from neutron star binaries, and therefore akey window in which to study primordial gravitational waves generated byinflation. While inflationary energy scales of $\gtrsim 10^{16}$ GeV yieldinflationary gravitational wave backgrounds in excess of our range of predictedbackgrounds, for lower energy scales of $\sim10^{15}$ GeV, the inflationarygravitational wave background becomes comparable to the noise background fromSNe Ia.

The Stochastic Gravitational Wave Background from the Single-Degenerate Channel of Type Ia Supernovae