Gravitational Waves from Inspiralling Compact Binaries in ... - LUTH

Gravitational Waves from Inspiralling Compact Binaries in ... - LUTH Gravitational Waves from Inspiralling Compact Binaries in ... - LUTH

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Method of variation of constants To do the phasing, solve the evolution equations for {c1, c2, cl, cλ}, on the 2PN accurate orbital dynamics. This leads to an evolution system, in which the RHS contains terms of order O(c −5 ) × 1 + O(c −2 ) + O(c −4 ) = O(c −5 ) + O(c −7 ) + O(c −9 ). As a first step, restrict attention to the leading order contributions to ¯ Gα and ˜Gα, which define the evolution of {¯cα, ˜cα} under GRR to O(c −5 ) order. Impose these variations, on to h× and h+. This will allow to obtain GW polarizations, which are Newtonian accurate in their amplitudes and 2.5PN accurate in orbital dynamics. 2.5PN accurate phasing of GW. Since ˜ Gα’s create only periodic 2.5PN corrections to the dynamics, Later look at the consequences of considering PN corrections to ¯ Gα by computing O(c −9 ) contributions to relevant d¯cα dt . This is required as ¯ Gα directly contribute to the highly important adiabatic evolution of h× and h+. Two constants c1 and c2 assumed to be energy and the angular momentum. Any functions of these conserved quantities can do as well. Convenient to use as c1 the mean motion n, and as c2 the time-eccentricity et. Will require to express 2PN accurate orbital dynamics in terms of l, n and et. Evolution equations for dn det , dt dt , dcl dt and dcλ in terms of l, n and et. dt BRI-IHP06-I – p.114/??

Implementation Compute 3PN accurate parametric expressions for the dynamical variables r, ˙r, φ, and ˙ φ entering the expressions for h+|Q and h×|Q Solve the evolution equations for c1, c2, cl, and cλ, on the 3PN accurate orbital dynamics. This leads to an evolution system, where the RHS contains dominant O(c −5 ) terms and their first corrections, i.e., O(c −7 ) terms. Later impose these variations on the 3PN accurate expressions for the dynamical variables r, ˙r, φ, and ˙ φ, appearing in h+|Q and h×|Q. This allows us to obtain GW polarizations, which are Newtonian accurate in their amplitudes and 3.5PN accurate in the orbital dynamics. Called 3.5PN accurate phasing of GW. Quasi-periodic oscillations in cα, governed by ˜Gα, are restricted to the 1PN reactive order. Therefore, not explore higher-PN corrections to the above ˜Gα. BRI-IHP06-I – p.115/??

Implementation<br />

Compute 3PN accurate parametric expressions for the<br />

dynamical variables r, ˙r, φ, and ˙ φ enter<strong>in</strong>g the expressions for<br />

h+|Q and h×|Q<br />

Solve the evolution equations for c1, c2, cl, and cλ, on the 3PN<br />

accurate orbital dynamics. This leads to an evolution system,<br />

where the RHS conta<strong>in</strong>s dom<strong>in</strong>ant O(c −5 ) terms and their first<br />

corrections, i.e., O(c −7 ) terms.<br />

Later impose these variations on the 3PN accurate<br />

expressions for the dynamical variables r, ˙r, φ, and ˙ φ,<br />

appear<strong>in</strong>g <strong>in</strong> h+|Q and h×|Q. This allows us to obta<strong>in</strong> GW<br />

polarizations, which are Newtonian accurate <strong>in</strong> their<br />

amplitudes and 3.5PN accurate <strong>in</strong> the orbital dynamics.<br />

Called 3.5PN accurate phas<strong>in</strong>g of GW.<br />

Quasi-periodic oscillations <strong>in</strong> cα, governed by ˜Gα, are<br />

restricted to the 1PN reactive order. Therefore, not explore<br />

higher-PN corrections to the above ˜Gα. BRI-IHP06-I – p.115/??

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