تکامل فیزیکی | United States America (US)

Create: 2025-06-11 Update: 2025-07-06 09:37:00

آیا انرژی تاریک در حال تغییر است؟
راز تاریکی که DESI فاش کرد!

پژوهشگران در مقاله‌ای جدید بررسی کرده‌اند که آیا انرژی تاریک که عامل شتابدار شدن انبساط کیهانی ست، یک نیروی ثابت است یا در طول زمان تغییر می‌کند.
چرا این موضوع مهم است؟
اگر انرژی تاریک متغیر باشد، مدل کیهان‌شناسی استاندارد (ΛCDM)باید بازنگری شود و این می‌تواند دروازه‌ای به سوی نظریه‌های جدید در فیزیک بنیادی باشد.
محققان در این مقاله با تحلیل داده‌های دقیق پروژه DESI، ابرنواخترهای نوع Ia و اندازه‌گیری‌های BAO، نشان می‌دهند مدل‌هایی که انرژی تاریک را متغیر در نظر می‌گیرند، تطابق بهتری با داده‌ها دارند. این مدل‌ها، به‌ویژه مدل‌های پارامتریک مانند w(z)، می‌توانند جایگزین مناسبی برای مدل ΛCDM باشد.
نگاه به آینده:
با ورود داده‌های جدید از مأموریت‌های فضایی مانند Euclid، درک ما از ماهیت انرژی تاریک به‌زودی دگرگون خواهد شد. اگر روند کنونی تأیید شود، ممکن است در آستانه بازنویسی نظریه کیهان شناسی مدرن قرار بگیریم!

لینک مقاله

#انرژی_تاریک
#مدل_استاندارد
#انبساط_کیهان
#ثابت_کیهانشناسی
#کیهان_شناسی

تکامل فیزیکی

arXiv.org

Probing Dark Energy Evolution Post-DESI 2024

We study the evidence for dark energy (DE) evolution at low redshift, using baryonic acoustic oscillations (BAOs) from the DESI Early Data Release, Pantheon+ Type Ia supernovae (SNe-Ia), and...

hottg.com/physical_evolution/1245

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Telegram and Signal Havens for Right-Wing Extremists

Since the violent storming of Capitol Hill and subsequent ban of former U.S. President Donald Trump from Facebook and Twitter, the removal of Parler from Amazon’s servers, and the de-platforming of incendiary right-wing content, messaging services Telegram and Signal have seen a deluge of new users. In January alone, Telegram reported 90 million new accounts. Its founder, Pavel Durov, described this as “the largest digital migration in human history.” Signal reportedly doubled its user base to 40 million people and became the most downloaded app in 70 countries. The two services rely on encryption to protect the privacy of user communication, which has made them popular with protesters seeking to conceal their identities against repressive governments in places like Belarus, Hong Kong, and Iran. But the same encryption technology has also made them a favored communication tool for criminals and terrorist groups, including al Qaeda and the Islamic State.

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