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<p>Buenos días, </p>
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<p> les recordamos que <b>mañana viernes 25 de abril a las
10:30h </b>se brindará, en el Salón Meridiano, el Seminario
FCAG <b>"<span lang="EN-US" style="color:black">Global
Anisotropies of </span><span style="color:black">Ω<sub>Λ</sub></span>"</b>.
El mismo estará a cargo del <b>Dr. <span>Alejandro
Clocchiatti (</span></b><span style="color:black"><b>Instituto
de Astrofísica de la Pontificia Universidad Católica de
Chile)</b>, profesor invitado por el Dr. Omar Bevenuto. </span>A
continuación, les dejamos el resumen y los datos de conexión
para aquellos que no puedan acercarse al Salón Meridiano.</p>
<p><b>Resumen: </b><span lang="EN-US" style="color:black">An
analysis of the cosmological parameter </span><span
style="color:black">Ω<sub>Λ</sub></span><span lang="EN-US"
style="color:black"> fitted to subsamples of the Pantheon+
Type Ia supernova sample spanning 2</span><i><span
style="color:black">π</span></i><span lang="EN-US"
style="color:black"> steradians for a grid of 432 pole
positions covering the whole sky reveals two large-scale
asymmetries. One of them is closely aligned with the
Galactic north–south direction and the other points
approximately toward R.A. </span><span lang="EN-US"
style="font-family:"Cambria Math",serif;color:black">∼</span><span
lang="EN-US" style="color:black"> 217</span><span
style="color:black"><img width="5" height="11"
style="width:.05in;height:.1166in"
id="m_-6498786878299986605Picture_x0020_4"
src="cid:part1.HkeM9DHX.xqwvtYg9@fcaglp.unlp.edu.ar"
alt="fdg" class=""></span><span lang="EN-US"
style="color:black">5, decl. </span><span lang="EN-US"
style="font-family:"Cambria Math",serif;color:black">∼</span><span
lang="EN-US" style="color:black"> −26</span><span
style="color:black"><img width="5" height="11"
style="width:.05in;height:.1166in"
id="m_-6498786878299986605Picture_x0020_3"
src="cid:part1.HkeM9DHX.xqwvtYg9@fcaglp.unlp.edu.ar"
alt="fdg" class=""></span><span lang="EN-US"
style="color:black">4, </span><span lang="EN-US"
style="font-family:"Cambria Math",serif;color:black">∼</span><span
lang="EN-US" style="color:black">50</span><span
style="color:black"><img width="5" height="11"
style="width:.05in;height:.1166in"
id="m_-6498786878299986605Picture_x0020_2"
src="cid:part1.HkeM9DHX.xqwvtYg9@fcaglp.unlp.edu.ar"
alt="fdg" class=""></span><span lang="EN-US"
style="color:black">9 from the cosmic microwave background
dipole Apex. The signal-to-noise ratio (S/N) of the multiple
</span><span style="color:black">Ω<sub>Λ</sub></span><span
lang="EN-US" style="color:black"> measurements in these
directions is 3.2 </span><span lang="EN-US"
style="font-family:"Cambria Math",serif;color:black">≲</span><span
lang="EN-US" style="color:black"> S/N </span><span
lang="EN-US"
style="font-family:"Cambria Math",serif;color:black">≲</span><span
lang="EN-US" style="color:black"> 8.4. The first asymmetry
is puzzling and would indicate a systematic effect related
with the distribution of Pantheon+ supernovae on the sky
and, probably, how the correction for reddening in the
Galaxy is calculated. The second one, which entails a 2.8-</span><span
style="color:black">σ</span><span lang="EN-US"
style="color:black"> tension between </span><span
style="color:black">Ω<sub>Λ</sub></span><span lang="EN-US"
style="color:black"> measured in opposite directions, bears
strong implications on our interpretation of </span><span
style="color:black">Ω<sub>Λ</sub></span><span lang="EN-US"
style="color:black"> as dark energy: it is consistent with
the prediction for tilted observers located in a
Friedmann–Robertson–Walker universe who could measure an
acceleration or a deceleration with a dipolar asymmetry,
irrespective of what the universe as a whole is doing. In
this case, </span><span style="color:black">Ω<sub>Λ</sub></span><span
lang="EN-US" style="color:black"> would not be a physical
entity, a real dark energy, but an apparent effect
associated with the relativistic frame of reference
transformation.</span></p>
<p><b><u>Datos de conexión:</u></b> </p>
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style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">-Sala personal de </span><span
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href="mailto:posgrado@fcaglp.unlp.edu.ar"
moz-do-not-send="true"><font color="#000000">posgrado@fcaglp.unlp.edu.ar</font></a></span></p>
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style="line-height:1.2;text-align: justify;margin-top:0pt;margin-bottom:0pt;"><span
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href="https://unlp.webex.com/meet/posgrado1"
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style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">28704029699</span></p>
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<span
style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 700; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A fin de reducir el uso de residuos plásticos, les solicitamos que se acerquen con sus propias tazas para el café. </span><span
style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Aunque este seminario será en formato híbrido, esperamos contar con su presencia.</span></b>
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<p><b style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7">Saludos, </b></p>
<b style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7">SeCyT-FCAG</b>
<pre class="moz-signature" cols="72">--
Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs</pre>
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