... | @@ -37,7 +37,7 @@ The phase correction used here has the form: |
... | @@ -37,7 +37,7 @@ The phase correction used here has the form: |
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The difference stems from the 2 points:
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The difference stems from the 2 points:
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1. The correction is parametrized in terms of $` A_{\alpha,eff}`$ instead of $` \lambda_{A,eff}`$
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1. The correction is parametrized in terms of $` A_{\alpha,eff}`$ instead of $` \lambda_{A,eff}`$
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2. The correction used in lal inference was derived using phase velocity, while this one uses group velocity, following `https://dcc.ligo.org/DocDB/0182/P2200154/001/GW_phase_degeneracies.pdf`.
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2. The correction used in lal inference was derived using phase velocity, while this one uses group velocity, following `https://arxiv.org/pdf/2203.13252.pdf`.
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## Reparametrizing phase velocity correction in terms of A
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## Reparametrizing phase velocity correction in terms of A
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... | @@ -64,12 +64,12 @@ and then follow the steps of route 1. |
... | @@ -64,12 +64,12 @@ and then follow the steps of route 1. |
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## Parametrization in terms of group velocity.
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## Parametrization in terms of group velocity.
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Reference `https://dcc.ligo.org/DocDB/0182/P2200154/001/GW_phase_degeneracies.pdf` derives the LIV correction if one uses group velocity instead of phase velocity. The result is eq. 2.9:
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Reference `https://arxiv.org/pdf/2203.13252.pdf` derives the LIV correction if one uses group velocity instead of phase velocity. The result is eq. 2.9:
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```math
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```math
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\delta \Phi_{\alpha}(f)= -\frac{D_\alpha [\omega(1+z)]^{\alpha-1}}{2}A_{\alpha}
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\delta \Phi_{\alpha}(f)= -\frac{D_\alpha [\omega(1+z)]^{\alpha-1}}{2c}A_{\alpha}
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```
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```
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The paper uses $`\hbar=1`$ and does not include $'c'$ in the definition of $`D_\alpha`$ (so it is in units of time). Accounting for these, the phase correction becomes:
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The paper uses $`\hbar=1`$ - accounting for it, the phase correction becomes:
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```math
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```math
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\delta \Phi_{\alpha}(f)= -\frac{\pi D_\alpha [f(1+z)]^{\alpha-1}h^{\alpha-2}}{c}A_{\alpha}= -\frac{\pi D_L h^{\alpha-2}}{c}A_{\alpha,eff}(f )^{\alpha-1}
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\delta \Phi_{\alpha}(f)= -\frac{\pi D_\alpha [f(1+z)]^{\alpha-1}h^{\alpha-2}}{c}A_{\alpha}= -\frac{\pi D_L h^{\alpha-2}}{c}A_{\alpha,eff}(f )^{\alpha-1}
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