{"id":402,"date":"2026-07-31T03:26:56","date_gmt":"2026-07-31T09:26:56","guid":{"rendered":"https:\/\/lgcmm.izt.uam.mx\/?page_id=402"},"modified":"2026-08-14T17:54:53","modified_gmt":"2026-08-14T23:54:53","slug":"gravitation-and-cosmology","status":"publish","type":"page","link":"https:\/\/lgcmm.izt.uam.mx\/?page_id=402","title":{"rendered":"Gravitation and Cosmology"},"content":{"rendered":"\n<div class=\"lgm-hero\">\n    <div class=\"lgm-overlay\"><\/div>\n\n    <div class=\"lgm-content\">\n\n        <span class=\"lgm-subtitle\">\n            symposium on\n        <\/span>\n\n        <h1 class=\"lgm-title\">\n            Gravitation and Cosmology\n        <\/h1>\n\n        <div class=\"lgm-divider\"><\/div>\n\n\n    <\/div>\n<\/div>\n\n<style>\n\n.lgm-hero{\n    background:#69725E; \/* Dusty Olive *\/\n    color:white;\n    padding:120px 30px;\n    text-align:center;\n    position:relative;\n    overflow:hidden;\n}\n\n.lgm-overlay{\n    position:absolute;\n    inset:0;\n    background:\n    radial-gradient(circle at top right,\n    rgba(215,133,33,.12),\n    transparent 45%);\n}\n\n.lgm-content{\n    position:relative;\n    z-index:2;\n    max-width:900px;\n    margin:auto;\n}\n\n.lgm-subtitle{\n    display:block;\n    letter-spacing:4px;\n    text-transform:uppercase;\n    color:#D78521;\n    font-size:.95rem;\n    margin-bottom:18px;\n    opacity:0;\n    animation:fadeUp 1s .3s forwards;\n}\n\n.lgm-title{\n\n    font-family:\"Times New Roman\", Times, serif;\n    font-size:clamp(2.8rem,6vw,5.5rem);\n    font-weight:500;\n    line-height:1.1;\n    margin:0;\n\n    color:#E6E4CD;\n\n    opacity:0;\n    transform:translateY(30px);\n    animation:fadeUp 1s .6s forwards;\n\n}\n\n.lgm-divider{\n\n    width:180px;\n    height:2px;\n\n    margin:30px auto;\n\n    background:linear-gradient(\n        90deg,\n        transparent,\n        #D78521,\n        transparent\n    );\n\n    opacity:0;\n\n    animation:fadeUp 1s forwards;\n    animation-delay:1s;\n\n}\n\n.lgm-description{\n\n    max-width:700px;\n    margin:auto;\n    color:#E6E4CD;\n    font-size:1.1rem;\n    line-height:1.8;\n\n    opacity:0;\n    animation:fadeUp 1s 1.6s forwards;\n\n}\n\n@keyframes fadeUp{\n\n    from{\n        opacity:0;\n        transform:translateY(35px);\n    }\n\n    to{\n        opacity:1;\n        transform:translateY(0);\n    }\n\n}\n\n@keyframes expandLine{\n\n    from{\n        width:0;\n    }\n\n    to{\n        width:180px;\n    }\n\n}\n\n.lgm-hero::before{\n\n    content:\"\";\n    position:absolute;\n    width:650px;\n    height:650px;\n    border:1px solid rgba(230,228,205,.08);\n    border-radius:50%;\n    left:-250px;\n    top:-220px;\n\n}\n\n.lgm-hero::after{\n\n    content:\"\";\n    position:absolute;\n    width:500px;\n    height:500px;\n    border:1px solid rgba(230,228,205,.05);\n    border-radius:50%;\n    right:-180px;\n    bottom:-180px;\n\n}\n\n<\/style>\n\n\n\n<div style=\"margin-top:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);height:38px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<section class=\"superplenary\">\n\n    <div class=\"superplenary-container\">\n\n        <div class=\"lgm-divider\"><\/div>\n\n        <span class=\"super-label\">Superplenary<\/span>\n\n        <h2>\n           The use of gravitational (quantum) metrological triangles\n        <\/h2>\n\n        <div class=\"super-content\">\n\n            <img decoding=\"async\" src=\"https:\/\/lgcmm.izt.uam.mx\/wp-content\/uploads\/2026\/07\/Klaus-3.png\" alt=\"Speaker\">\n\n            <div class=\"super-info\">\n\n                <h3>\n                    Dr. Claus L\u00e4mmerzahl\n                <\/h3>\n\n                <p class=\"institution\">\n                    More about this speaker soon.\n                <\/p>\n\n                <p class=\"description\">\n                    Though general relativistic effects can be measured with very high precision, the gravitational constant &#8211; one of our most fundamental constants in physics &#8211; can be determined with very low precision only. In electrodynamics there are consistency relations between fundamental constants which are called metrological triangles. We show that such a concept of a metrological triangle can also be introduced in Einstein&#8217;s General Relativity. We show that it is possible to introduce a gravitational classical metrological triangle made of gravitational permittivities and permeabilities as well as of the speed of gravity. This allows to include more existing high precision tests to the exploration of the nature of gravity. As a result it is possible to improve the determination of Solar System general relativistic effects. Beyond this classical metrological triangle it is also possible to introduce a gravitational quantum metrological triangle. This is based on gravitational analogues of the Josephson effect and the quantum Hall effect. This quantum metrological triangle gives additional insight into gravity, suggests new laboratory tests for gravity, and also may allow a new definition of the kilogram.\n                <\/p>\n\n            <\/div>\n\n        <\/div>\n\n    <\/div>\n\n<\/section>\n\n\n<style>\n\n.lgm-divider{\n\n    width:180px;\n    height:2px;\n\n    background:linear-gradient(\n        90deg,\n        transparent,\n        #D78521,\n        transparent\n    );\n\n    margin:35px auto;\n\n}\n\n\n.superplenary{\n\n    background:#550527;\n\n    padding:100px 20px;\n\n    color:#F8F7F2;\n\n    overflow:hidden;\n\n}\n\n\n.superplenary-container{\n\n    max-width:1100px;\n\n    margin:auto;\n\n    text-align:center;\n\n}\n\n\n\/* Etiqueta *\/\n\n.super-label{\n\n    font-family:\"Times New Roman\", serif;\n\n    letter-spacing:.4em;\n\n    text-transform:uppercase;\n\n    font-size:.8rem;\n\n    color:#E6E4CD;\n\n}\n\n\n\/* T\u00edtulo *\/\n\n.superplenary h2{\n\n    font-family:\"Times New Roman\", serif;\n\n    font-weight:400;\n\n    font-size:3rem;\n\n    margin:25px 0 60px;\n\n    letter-spacing:.03em;\n\n    color:#F8F7F2 !important;\n\n}\n\n\n\/* Contenido *\/\n\n.super-content{\n\n    display:flex;\n\n    align-items:center;\n\n    justify-content:center;\n\n    gap:60px;\n\n    text-align:left;\n\n}\n\n\n\/* Foto *\/\n\n.super-content img{\n\n    width:280px;\n\n    height:280px;\n\n    object-fit:cover;\n\n    border-radius:50%;\n\n    border:3px solid rgba(215,133,33,.8);\n\n}\n\n\n\/* Informaci\u00f3n *\/\n\n.super-info{\n\n    max-width:450px;\n\n}\n\n\n.super-info h3{\n\n    font-family:\"Times New Roman\", serif;\n\n    font-size:2rem;\n\n    font-weight:400;\n\n    margin-bottom:10px;\n\n    color:#F8F7F2 !important;\n\n}\n\n\n.institution{\n\n    color:#D78521;\n\n    letter-spacing:.15em;\n\n    text-transform:uppercase;\n\n    font-size:.85rem;\n\n}\n\n\n\/* Texto justificado *\/\n\n.super-info .description{\n\n    color:#E6E4CD;\n\n    line-height:1.7;\n\n    text-align:justify;\n\n}\n\n\n@media(max-width:800px){\n\n    .super-content{\n\n        flex-direction:column;\n\n        text-align:center;\n\n    }\n\n    .super-info{\n\n        max-width:100%;\n\n    }\n\n    .superplenary h2{\n\n        font-size:2rem;\n\n    }\n\n    .super-info .description{\n\n        text-align:justify;\n\n    }\n\n}\n\n\n\/* Animaci\u00f3n scroll *\/\n\n.superplenary{\n\n    opacity:0;\n\n    transform:translateY(50px);\n\n    transition:1s ease;\n\n}\n\n\n.superplenary.show{\n\n    opacity:1;\n\n    transform:translateY(0);\n\n}\n\n<\/style>\n\n\n<script>\n\ndocument.addEventListener(\"DOMContentLoaded\",()=>{\n\n    const section=document.querySelector(\".superplenary\");\n\n    const observer=new IntersectionObserver(entries=>{\n\n        entries.forEach(entry=>{\n\n            if(entry.isIntersecting){\n\n                section.classList.add(\"show\");\n\n            }else{\n\n                section.classList.remove(\"show\");\n\n            }\n\n        });\n\n    },{threshold:.2});\n\n    observer.observe(section);\n\n});\n\n<\/script>\n\n\n\n<script data-wp-block-html=\"js\">\n<script>\n\nconst observer = new IntersectionObserver((entries)=>{\n\nentries.forEach(entry=>{\n\nif(entry.isIntersecting){\n\nentry.target.classList.add(\"show\");\n\n}\n\n});\n\n},{threshold:.15});\n\ndocument.querySelectorAll(\".speaker-card\").forEach((card,index)=>{\n\ncard.style.transitionDelay=(index*0.08)+\"s\";\n\nobserver.observe(card);\n\n});\n\nobserver.observe(document.querySelector(\".section-title\"));\n<\/script>\n\n<section class=\"speakers-section\">\n\n<h2 class=\"section-title\">Plenary Speakers<\/h2>\n\n<div class=\"speaker-grid\">\n\n<!-- SPEAKER -->\n<div class=\"speaker-card\">\n\n    <img decoding=\"async\" src=\"https:\/\/lgcmm.izt.uam.mx\/wp-content\/uploads\/2026\/07\/Tim-Eifler.png\" class=\"speaker-photo\">\n\n    <h3>Tim Eifler<\/h3>\n\n    <p class=\"institution\">\n        University of Arizona\n    <\/p>\n\n    <h4 class=\"talk-title\">\n        Talk Title: To be announced\n    <\/h4>\n\n    <button class=\"view-details-btn\" data-name=\"Tim Eifler\" data-institution=\"University of Arizona\" data-talk=\"Talk Title: To be announced\" data-photo=\"https:\/\/lgcmm.izt.uam.mx\/wp-content\/uploads\/2026\/07\/Tim-Eifler.png\" data-bio=\" Dr. Eifler got his PhD in 2009 from the University of Bonn, Germany. He held postdoctoral positions at the Ohio State University and the University of Pennsylvania before becoming a staff scientist at NASA-JPL and then faculty at UArizona. Dr. Eifler joined Steward Observatory in August 2018. His research focuses on testing models of cosmological structure formation (dark energy, dark matter, modified gravity) through statistical data analysis. He is interested in optimally extracting the cosmological information from ongoing and future datasets such as the Dark Energy Survey, the Dark Energy Spectroscopic Instrument, Rubin Observatory, the NASA SPHEREx explorer satellite, the Nancy Grace Roman Space Telescope, and future CMB experiments. A key element of his research is to combine multiple probes and measurements, e.g. weak lensing, galaxy clustering, galaxy clusters and CMB lensing.\" data-abstract=\"More about this speaker soon.\">\n        View Details\n    <\/button>\n\n<\/div>\n\n\n<\/div>\n\n<\/section>\n\n<div class=\"contributions-banner\">\n    <span>Contributions<\/span>\n<\/div>\n\n<!-- MODAL (una sola vez, fuera del grid) -->\n<div class=\"speaker-modal-overlay\" id=\"speakerModalOverlay\">\n    <div class=\"speaker-modal\" role=\"dialog\" aria-modal=\"true\" aria-labelledby=\"modalSpeakerName\">\n        <button class=\"speaker-modal-close\" id=\"speakerModalClose\" aria-label=\"Close\">\u00d7<\/button>\n        <img decoding=\"async\" src=\"\" class=\"modal-photo\" id=\"modalPhoto\" alt=\"\">\n        <h3 id=\"modalSpeakerName\"><\/h3>\n        <p class=\"institution\" id=\"modalInstitution\"><\/p>\n        <h4 class=\"talk-title\" id=\"modalTalk\"><\/h4>\n\n        <div class=\"modal-details\">\n\n            <h5>Abstract<\/h5>\n            <p id=\"modalAbstract\"><\/p>\n\n            <h5>Biography<\/h5>\n            <p id=\"modalBio\"><\/p>\n\n        <\/div>\n    <\/div>\n<\/div>\n\n<style>\n\n.speakers-section{\n    padding:90px 20px;\n    background:rgba(230,228,205,.55);\n    backdrop-filter:blur(3px);\n}\n\n.section-title{\n    text-align:center;\n    font-family:\"Times New Roman\", Times, serif;\n    font-size:3rem;\n    color:#550527;\n    margin-bottom:60px;\n}\n\n.speaker-grid{\n    display:grid;\n    grid-template-columns:repeat(auto-fit,minmax(300px,1fr));\n    gap:35px;\n    max-width:1400px;\n    margin:auto;\n}\n\n.speaker-card{\n    background:white;\n    border-radius:22px;\n    padding:35px;\n    box-shadow:0 12px 30px rgba(0,0,0,.08);\n    transition:.35s;\n    border-top:6px solid #D78521;\n    display:flex;\n    flex-direction:column;\n    align-items:center;\n}\n\n.speaker-card:hover{\n    transform:translateY(-8px);\n    box-shadow:0 18px 45px rgba(0,0,0,.15);\n}\n\n.speaker-photo{\n    width:130px;\n    height:130px;\n    border-radius:50%;\n    object-fit:cover;\n    display:block;\n    margin:auto;\n    border:5px solid #69725E;\n}\n\n.speaker-card h3{\n    margin-top:20px;\n    text-align:center;\n    font-family:\"Times New Roman\", Times, serif;\n    color:#221D23;\n}\n\n.institution{\n    text-align:center;\n    font-style:italic;\n    color:#69725E;\n    margin-bottom:18px;\n}\n\n.talk-title{\n    text-align:center;\n    color:#550527;\n    font-size:1.1rem;\n    min-height:60px;\n}\n\n\/* Button replaces <summary> \u2014 same look, now triggers the modal instead of inline expansion *\/\n.view-details-btn{\n    cursor:pointer;\n    background:#69725E;\n    color:white;\n    padding:12px 24px;\n    border:none;\n    border-radius:10px;\n    text-align:center;\n    font-weight:bold;\n    font-size:1rem;\n    margin-top:20px;\n    transition:background .25s;\n}\n\n.view-details-btn:hover{\n    background:#550527;\n}\n\n\/* ---------- CONTRIBUTIONS BANNER ---------- *\/\n\n.contributions-banner{\n    background:#550527;\n    padding:28px 20px;\n    text-align:center;\n}\n\n.contributions-banner span{\n    font-family:\"Times New Roman\", Times, serif;\n    font-size:2.2rem;\n    letter-spacing:1px;\n    color:#F4F1EA;\n}\n\n\/* ---------- MODAL ---------- *\/\n\n.speaker-modal-overlay{\n    display:none;\n    position:fixed;\n    inset:0;\n    background:rgba(34,29,35,.6);\n    backdrop-filter:blur(4px);\n    z-index:1000;\n    align-items:center;\n    justify-content:center;\n    padding:20px;\n}\n\n.speaker-modal-overlay.open{\n    display:flex;\n}\n\n.speaker-modal{\n    background:#fff;\n    border-radius:22px;\n    padding:45px;\n    max-width:560px;\n    width:100%;\n    max-height:85vh;\n    overflow-y:auto;\n    position:relative;\n    border-top:6px solid #D78521;\n    box-shadow:0 25px 60px rgba(0,0,0,.3);\n    animation:modalPop .25s ease;\n}\n\n@keyframes modalPop{\n    from{ opacity:0; 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