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<div><span>Dear everyone,</span></div>
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<div><span>This weeks seminar will be held by one of the most recent additions to the EO group, Alex Brown. The presentation</span></div>
<div><span>will focus on material published here <a href="https://arxiv.org/abs/2210.14025" target="_blank" rel="noopener noreferrer" class="x_OWAAutoLink" id="LPlnk380251">
https://arxiv.org/abs/2210.14025</a><br>
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<div><span>I look forward to seeing you all there, zoom can be setup upon request. Let me know if you are away and still</span></div>
<div><span>would like to attend. We will meet in A5:1003, as last time.<br>
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All events are now in the calendar, which you can find here <a href="https://indico.fysik.su.se/category/289/" target="_blank" rel="noopener noreferrer" class="x_OWAAutoLink" id="LPlnk85416">
https://indico.fysik.su.se/category/289/</a><br>
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<div><span>It can easily be imported into any calendar software.<br>
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<div><b>Speaker: Stephanie (Alex) Brown</b><br>
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<div><b>Title: </b>Tidal Deformability of Neutron Stars in Scalar-Tensor Theories of Gravity for Gravitational Wave Analysis</div>
<div><b>Room:</b> A5:1003<br>
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<div><b>Abstract: </b>Gravitational waves from compact binary coalescences are valuable for testing theories of gravity in the strong-field regime.
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<div>They have also led to improved constraints on the nuclear equation of state at extreme
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<div>densities by measuring the tidal Love numbers of merging neutron stars. <br>
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<div>Tidal Love numbers in alternate theories are expected to differ from their general relativistic counterpart.
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<div>Despite this, tests of general relativity use the general relativistic tidal Love numbers.<br>
Here, we calculate the $l\geq 2$ electric and magnetic tidal Love numbers for non-rotating stars in mono-scalar-tensor
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<div>theories assuming spontaneous scalarization. We then use several viable equations of state to explore how the mass, radius, and tidal deformability
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<div>relations differ from those of general relativity. The electric tidal deformability can differ by $\sim 350\%$, and the magnetic tidal deformability differs by $\sim 200 \%$.
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<div>These deviations occur at large compactnesses ($C = M/r > 0.2$) and vary slightly depending on the equation of state. Lastly, we perform Bayesian parameter
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<div>estimation of GW170817 to explore exactly how these modified tidal relations can effect inference.<br>
We find that tidal Love numbers and tidal deformabilities can differ significantly from those in general relativity. These changes cause the inferred equation of state to differ
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between general relativity and scalar tensor theory.<br>
Applying these tidal Love numbers to the study of gravitational waves will allow for more consistent and accurate tests of scalar modes in gravitational waves from neutron star mergers.<br>
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Best,<br>
Haakon (on behalf of the organizers of the EO meeting)</div>
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